CN103433642A - Low-hydrogen basic electrode for 1Ni9 low-temperature steel welding and preparation method of low-hydrogen basic electrode - Google Patents

Abstract

Low-hydrogen alkaline electrode for welding 1Ni9 low-temperature steel, including welding core and coating. The welding core is composed of the following components by mass percentage: carbon 0.01-0.03%, manganese 0.5-0.9%, silicon 0.2-0.4%, chromium 21- 24%, iron 2.5-3.5%, molybdenum 8.5-9.5%, titanium 0.02-0.04%, niobium 4-4.5%, nitrogen 0.15-0.20%, sulfur<0.01%, phosphorus<0.01%, the balance is nickel; Include by mass percentage: 34-48% marble, 17-24% fluorite, 2-6% zircon sand, 1-4% ferrosilicon, 5-12% ferro-titanium, 3-5% medium carbon ferromanganese, 2 - 5% titanium dioxide, 2-5% rutile, 2-6% mica, 0.7-1% alkali, 1-3% mixed rare earth, the sum of the mass percentages of the above components is 100%. The invention solves the problems of high import price and poor performance of existing welding rods.

Description

Low-hydrogen basic electrode for welding 1Ni9 low-temperature steel and preparation method thereof

technical field

The invention belongs to the technical field of welding materials, and in particular relates to a low-hydrogen basic electrode for welding 1Ni9 low-temperature steel, and also relates to a preparation method of the electrode.

Background technique

1Ni9 steel is a low-carbon medium alloy steel with a nickel content of 9% and a carbon content of less than 0.13%. It has excellent strength, toughness and weldability at -196°C. Compared with stainless steel with excellent performance, 1Ni9 steel has the advantages of less alloy content and lower price; compared with aluminum alloy for low temperature, it has the advantages of large allowable stress and small thermal expansion rate. With the rapid development of the fan industry, 1Ni9 steel is widely used as the impeller material in the fan industry due to its good low temperature performance. Now the fan impeller is usually connected to the disc and the blade by welding. The welding quality of the impeller affects the service life of the fan. One of the key issues, which requires a large number of welding materials that match the impeller material and have excellent mechanical properties, corrosion resistance and ultra-low temperature performance. Since the existing welding rods matching 1Ni9 steel are mainly imported from abroad, the price is expensive, so the development of special welding materials for low-temperature martensitic 1Ni9 steel has broad market prospects and economic benefits.

Contents of the invention

The object of the present invention is to provide a low-hydrogen basic electrode for welding 1Ni9 low-temperature steel, which solves the problem that the existing electrode used for welding 1Ni9 steel needs to be imported from abroad, which is expensive and has poor performance.

Another object of the present invention is to provide a method for preparing the above welding rod.

The technical solution adopted in the present invention is: 1Ni9 low-temperature steel welding low-hydrogen alkaline electrode, including welding core and coating, welding core is composed of the following components according to mass percentage: carbon 0.01%-0.03%, manganese 0.5%-0.9 %, silicon 0.2%-0.4%, chromium 21%-24%, iron 2.5%-3.5%, molybdenum 8.5%-9.5%, titanium 0.02%-0.04%, niobium 4%-4.5%, nitrogen 0.15%-0.20% , sulfur<0.01%, phosphorus<0.01%, the balance is nickel, the sum of the mass percentages of the above components is 100%; the drug skin is composed of the following components by mass percentage: 34%-48% of marble, 17%- 24% fluorite, 2%-6% zircon sand, 1%-4% ferrosilicon, 5%-12% ferrotitanium, 3%-5% medium carbon ferromanganese, 2%-5% Titanium dioxide, 2%-5% rutile, 2%-6% mica, 0.7%-1% alkali, 1%-3% mixed rare earth, the sum of the weight percentages of the above components is 100%.

Another technical solution adopted by the present invention is that the preparation method of the above-mentioned welding rod comprises the following steps:

step 1,

Put industrial pure nickel with a mass ratio of 65%, ores containing C, Si, Ti, Nb, N, and Fe, Mo, Cr, and Mn together in an induction furnace for smelting. When the industrial pure nickel is completely melted, the molten alloy steel When the temperature reaches 1450°C, when the molten steel is calm, power off to cool and exhaust, and then power on for heating and refining. When the temperature continues to drop to the tapping temperature, the steel is tapped, and the furnace is filled with argon 5 minutes before tapping to make the furnace pressure reach 33. -47KPa, then add Mn to the molten steel and stir for 2 minutes before tapping, the tapping temperature is 1450°C, when pouring, the surface of the molten steel is required to be calm, pour evenly, cool to room temperature to obtain a steel ingot, so that the mass percentage of the steel ingot is: carbon 0.01%- 0.03%, manganese 0.5%-0.9%, silicon 0.2%-0.4%, chromium 21%-24%, iron 2.5%-3.5%, molybdenum 8.5%-9.5%, titanium 0.02%-0.04%, niobium 4%-4.5% %, nitrogen 0.15%-0.20%, sulfur <0.01%, phosphorus <0.01%, the balance is nickel, and the sum of the mass percentages of the above components is 100%;

Step 2,

盘条后机械剥壳，再在耐酸混凝土酸洗池中进行酸洗去锈后烘干，用回转式拉丝机进行干法拉丝后卷取，热处理后用回转式拉丝机再次干法拉丝，缠绕成直径为4.0mm的焊丝，即焊芯；After peeling the steel ingot obtained in step 1, forge it into a billet with a 750kg steam hammer, remove the black skin and cracks on the surface of the billet after cooling to room temperature, and cut off the riser, and then roll the billet into a billet with a rolling mill.

After the wire rod is mechanically peeled off, it is pickled in an acid-resistant concrete pickling pool to remove rust and then dried. It is coiled after dry drawing with a rotary wire drawing machine. After heat treatment, it is again dry drawn with a rotary wire drawing machine and wound. Form a welding wire with a diameter of 4.0mm, that is, the welding core;

Step 3,

Weigh 34%-48% marble, 17%-24% fluorite, 2%-6% zircon sand, 1%-4% ferrosilicon, 5%-12% ferrosilicon according to mass percentage , 3%-5% medium carbon ferromanganese, 2%-5% titanium dioxide, 2%-5% rutile, 2%-6% mica, 0.7%-1% alkali, 1%-3% The mixed rare earth, the sum of the mass percentages of the above components is 100%; put the above coating material and binder together in a mixer and mix, and then put the mixed powder into a compactor and press it into a cylinder shaped drug group;

Step 4,

Add the cylindrical drug pellets prepared in step 3 into the welding rod press coater, and press-coat the cylindrical pellets on the welding cores prepared in step 2, and then put them into a box furnace for step-by-step heating and drying, namely Get welding rods.

The present invention is also characterized in that,

In step 1, the time for cooling and exhausting is 10-20 minutes, and the time for heating and refining is 15-25 minutes.

In step 2, pickling adopts hydrochloric acid with a volume concentration of 15%, and the pickling time is 10-20min.

In step 2, a chain-type drying furnace is used for drying, the drying temperature is 145-150° C., and the drying speed is 1.5-2.5 m/s.

The heat treatment in step 2 is to heat the coiled wire to 670-680°C and then cool it naturally to room temperature.

In step 3, the traditional Chinese medicine powder binder is potassium sodium mixed water glass, and the addition amount is 30%-33% of the quality of the medicine skin.

The step-by-step drying steps in step 4 are as follows: firstly dry at 60°C for 10 hours, then dry at 120°C for 1 hour, 180°C for 1 hour, 250°C for 1 hour, and 350°C for 1 hour.

The beneficial effects of the present invention are: the low-hydrogen basic electrode for welding 1Ni9 low-temperature steel of the present invention solves the problem that the existing electrode matching the 1Ni9 steel needs to be imported from abroad, which is expensive and has poor performance, and its arc stability performance is good, The fluidity of the molten pool is good, the spatter particles are small, the slag is easy to remove after welding, the slag is evenly covered, the weld shape is meticulous and beautiful, and its preparation method is simple. The ultra-low temperature performance of the deposited metal of the electrode meets the needs of the enterprise.

Description of drawings

Fig. 1 is the metallographic diagram of the deposited metal of the welding rod that the embodiment of the present invention 1 makes;

Fig. 2 is the metallographic diagram of the deposited metal of the welding rod that the embodiment of the present invention 4 makes;

Fig. 3 is the metallographic diagram of the cross-section of the deposited metal weld seam of the electrode produced in Example 4 of the present invention.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

The low-hydrogen alkaline electrode for welding 1Ni9 low-temperature steel of the present invention includes a welding core and a coating, and the welding core is composed of the following components in terms of mass percentage: carbon 0.01%-0.03%, manganese 0.5%-0.9%, silicon 0.2%-0.4 %, chromium 21%-24%, iron 2.5%-3.5%, molybdenum 8.5%-9.5%, titanium 0.02%-0.04%, niobium 4%-4.5%, nitrogen 0.15%-0.20%, sulfur <0.01%, phosphorus <0.01%, the balance is nickel, the sum of the mass percentages of the above components is 100%; the coating is composed of the following components by mass percentage: 34%-48% marble, 17%-24% fluorite, 2 %-6% zircon sand, 1%-4% ferrosilicon, 5%-12% ferro-titanium, 3%-5% medium carbon ferromanganese, 2%-5% titanium dioxide, 2%- 5% rutile, 2%-6% mica, 0.7%-1% alkali, 1%-3% mixed rare earth, the sum of the weight percentages of the above components is 100%.

The preparation method of above-mentioned welding rod, comprises the following steps:

step 1,

Put industrial pure nickel with a mass ratio of 65%, ores containing C, Si, Ti, Nb, N, and Fe, Mo, Cr, and Mn together in an induction furnace for smelting. When the industrial pure nickel is completely melted, the molten alloy steel When the temperature reaches 1450°C and the molten steel is calm, cut off the power to cool and exhaust for 10-20 minutes, then turn on the power for heating and refining for 15-25 minutes. When the pressure in the furnace reaches 33-47KPa, add Mn to the molten steel and stir for 2 minutes before tapping. The tapping temperature is 1450°C. When pouring, the surface of the molten steel is required to be calm, pour evenly, and cool to room temperature to obtain steel ingots. During the smelting process, control Carbon 0.01%-0.03%, Manganese 0.5%-0.9%, Silicon 0.2%-0.4%, Chromium 21%-24%, Iron 2.5%-3.5%, Molybdenum 8.5%-9.5%, Titanium 0.02%-0.04%, Niobium 4%-4.5%, nitrogen 0.15%-0.20%, sulfur<0.01%, phosphorus<0.01%, the balance is Ni, the sum of the mass percentages of the above components is 100%;

Step 2,

盘条后机械剥壳，再在耐酸混凝土酸洗池中用体积浓度为15%的盐酸洗10-20min后采用链条式烘干炉在145-155℃烘干，烘干速度为1.5-2.5m/s，用回转式拉丝机进行干法拉丝后卷取，将卷取的焊丝加热至670-680℃后自然冷却至室温后用回转式拉丝机再次干法拉丝，缠绕成直径为4.0mm的焊丝，即焊芯；After peeling the steel ingot obtained in step 1, forge it into a billet with a 750kg steam hammer, remove the black skin and cracks on the surface of the billet after cooling to room temperature, and cut off the riser, and then roll the billet into a billet with a rolling mill.

After the wire rod is mechanically peeled off, it is washed with hydrochloric acid with a volume concentration of 15% in the acid-resistant concrete pickling pool for 10-20 minutes, and then dried in a chain-type drying furnace at 145-155 ° C, and the drying speed is 1.5-2.5m /s, use a rotary wire drawing machine for dry drawing and coiling, heat the coiled welding wire to 670-680°C, cool it to room temperature naturally, then dry draw again with a rotary wire drawing machine, and wind it into a wire with a diameter of 4.0mm Welding wire, that is, welding core;

Step 3,

Weigh 34%-48% marble, 17%-24% fluorite, 2%-6% zircon sand, 1%-4% ferrosilicon, 5%-12% ferrosilicon according to mass percentage , 3%-5% medium carbon ferromanganese, 2%-5% titanium dioxide, 2%-5% rutile, 2%-6% mica, 0.7%-1% alkali, 1%-3% Mixed rare earths (a mixture of 20% yttrium oxide, 20% cerium oxide and 60% lanthanum oxide), the sum of the weight percentages of the above components is 100%; the above powder materials and potassium sodium mixed water glass Put it into the blender and mix for 15 minutes, then put the mixed medicine powder into the ball press machine and press it into a cylindrical medicine ball; the amount of potassium sodium mixed water glass is 30%-33% of the medicine skin quality;

Step 4,

Add the cylindrical drug ball prepared in step 3 to the electrode press coater, and press-coat the cylindrical drug ball on the welding core prepared in step 2, and then put it into a box furnace at a low temperature of 60 ° C for 10 h, Then carry out step-by-step heating and drying at high temperature of 120°C×1h, 180°C×1h, 250°C×1h, 350°C×1h to make welding rods.

The low-hydrogen alkaline electrode for welding 1Ni9 low-temperature steel of the present invention solves the problem that the existing electrode matching 1Ni9 steel needs to be imported from abroad with high price and poor performance. The electrode produced by the present invention is compatible with the existing imported OK92. Compared with 55 electrode, it has good arc stability performance, good molten pool fluidity, fine spatter particles, easy slag removal after welding, uniform slag coverage, fine and beautiful weld shape, especially improved the problem of serious redness of electrode, and its The preparation method is simple, and the ultra-low temperature performance of the electrode deposited metal meets the needs of enterprises.

The role of each component in the welding core:

Carbon: Carbon is a strong austenite former. Due to the precipitation of carbides along the grain boundaries, the weld metal will be embrittled, and the phenomenon of chromium deficiency in the grain boundaries will occur, which will reduce the corrosion resistance of the weld metal; and the strengthening effect of the carbides at the grain boundaries can increase the strength and resistance of the weld metal. Increased abrasiveness. Therefore, for stainless steel welds that are mainly corrosion-resistant, it is better to have a lower carbon content; and for stainless steel welds that require high-temperature strength, their carbon content should be appropriate. Based on the above reasons, the present invention determines that the composition range of C in the welding core is 0.01%-0.03%.

Manganese: Manganese is an austenitization forming element. When the state of austenite + ferrite structure is not changed, manganese can improve the crack resistance of the weld and increase the plasticity of the weld; but when the manganese content is too high, it will cause the austenite of the weld to coarsen, and the weld The ability of seams to resist intergranular corrosion is reduced. The present invention determines that the content of manganese in the welding core is 0.5%-0.9%.

Silicon: Silicon is a ferrite former which increases the strength of the weld. In the austenite + ferrite duplex steel, it can reduce the low temperature impact toughness, but it can effectively increase the crack resistance of the austenite + ferrite duplex stainless steel weld. In oxidizing acids, silicon can increase the corrosion resistance of the weld, and can increase the intergranular corrosion resistance of the weld without coarsening the ferrite phase of the weld. Therefore, the content of silicon in the welding core is controlled at 0.2%-0.4%.

Chromium: Chromium is a ferrite forming element, which can increase the yield strength and ultimate strength of the weld, reduce the elongation and reduction of area, and sometimes reduce the impact toughness; and chromium can improve the intergranular corrosion resistance of the weld and improve Corrosion resistance of duplex stainless steel welds in oxidizing acids. Therefore, the range of the welding core network is controlled at 21%-24%.

Titanium and niobium: The addition of titanium and niobium to martensitic steels promotes the formation of carbides, thereby stabilizing the carbon and preventing intergranular corrosion. These two elements form MC-type carbides, which are insoluble during welding and heat treatment, and can prevent the formation of chromium-rich M ₂₃ C ₆ -type carbides, which prevents intergranular corrosion. In the present invention, it is determined that the content of titanium in the welding core is 0.02%-0.04%, and the content of niobium is 4%-4.5%.

Nitrogen: Nitrogen is a strong austenitization forming element, which can increase the plasticity of the weld without causing hot cracks in the weld. When the nickel content leads to the coarsening of the austenite phase in the weld, it will reduce the intergranular corrosion resistance of the weld, but increase the corrosion resistance of the weld in reducing acid. Nitrogen, like nickel, has an important influence on the formation of austenite. They are all elements that form and expand austenite, but the ability of nitrogen is much greater than that of nickel. At high temperature, the ability of nitrogen to stabilize austenite is greater than that of nickel, which can prevent single-phase ferrite after welding and prevent the precipitation of harmful metal phases. In order to suppress the excessive increase of ferrite in the weld, it is the welding trend of 1Ni9 steel to use austenite-dominated weld metal. Generally, the nickel content or nitrogen is added to the welding material. Usually the content of nickel is 2%-4% higher than that of the base metal. It is better to use nitrogen-containing filler materials than to only increase nickel. Both elements can increase the proportion of austenite and stabilize it, but Adding nitrogen can not only delay the precipitation of intermetallic phases, but also improve the strength and corrosion resistance of the weld metal. The content of nitrogen in the welding core determined by the present invention is 0.15%-0.20%.

Molybdenum: Molybdenum is a ferrite forming element that can improve the high temperature strength and crack resistance of stainless steel welds. When the molybdenum content is 8.5%-9.5%, it can significantly improve the corrosion resistance of welds in various acids, especially reducing acids, and can significantly improve the pitting resistance of weld metal. Therefore, the composition of molybdenum determined in the present invention is 8.5%-9.5%.

Sulfur and phosphorus: Sulfur and phosphorus are impurity elements. Sulfur increases the hot cracking tendency of the weld, and the lower the content in the weld, the better. The more ferrite phase in the weld, the weaker the harmful effect of phosphorus, at this time, phosphorus will not cause hot cracks. Sulfur and phosphorus are restrictive impurity elements, but reducing the content of sulfur and phosphorus indefinitely will inevitably lead to an increase in production costs, so the content of sulfur and phosphorus is controlled to be sulfur < 0.01% and phosphorus < 0.01%.

The role of each component in the drug skin:

The main chemical composition of marble is CaCO ₃ , and its main function in electrode coating is to generate slag and gas. The CaO decomposed from marble can not only stabilize the arc, but also has good desulfurization ability. Excessive use of marble will increase the melting point of the powder, slow down the welding speed, make the weld shape rough, and increase the viscosity of the slag, which will easily cause internal pores in the weld.

The main chemical composition of fluorite is CaF ₂ , which has a low melting point and has the effect of diluting slag, which will reduce the melting point of slag, thereby improving the conductivity and fluidity of slag. CaF ₂ decomposes during welding, forming The [F] captures the [O] produced by the reduction reaction in the slag, inhibits the transition of [O] to the deposited metal, thereby reducing the [O] content in the deposited metal, and reduces the [H] in the arc atmosphere Partial pressure, improving the plasticity and toughness of the weld and the performance of the welding process.

The main chemical composition of zircon sand is ZrO ₂ , with a melting point of 2715°C. It has two variants, one is monoclinic crystal stable below 1000°C, and the other is tetragonal crystal stable above 1000°C. When changing from one crystal to another, the volume changes by about 7%. Using this property can improve the slag removal performance of the flux and is beneficial to slag removal.

The addition of titanate is mainly based on rutile and titanium dioxide. Titanium dioxide can make the electrode coating have better plasticity and can improve the pressure coating process performance of the electrode, but if its dosage is too high, it will not only increase the cost but also make the electrode coating redden severely during the welding process. Rutile can make the electrode coating realize the characteristics of "short slag" in the process of welding melting. Because TiO ₂ has a low viscosity at high welding temperature, it is very beneficial to the spreading of molten metal in the weld, and when the arc moves away from a certain area , the viscosity of TiO ₂ in this area will increase sharply, which can effectively ensure the adaptability of the electrode to all-position vertical downward welding; at the same time, rutile can also play a role in stabilizing the arc. In the electrode coating, when the content of TiO ₂ is small, the arc will be unstable during welding, but if the content is too large, the arc blowing force will decrease. In a large number of production practices, it has also been found that when the content of TiO ₂ in the electrode coating is controlled reasonably, it not only stabilizes the arc, but also reduces welding spatter, and can also promote the spreading of molten pool metal, so that the weld shape is good to reduce welding. The formation of pores in the crevice.

Ferroalloy: Ferro-titanium is the main deoxidizer, and the product TiO ₂ after deoxidation has a certain effect of thinning slag, and ferro-titanium is beneficial to improve the process performance of welding rods. Ferrosilicon usually adopts low-grade ferrosilicon, with a Si content of about 45%. Low-grade ferrosilicon has good pressure coating performance, and the coating generally does not bubble during the process of drying the electrode. Generally, the amount of ferrosilicon is less than 5%. Excessive ferrosilicon will intensify the metallurgical reaction in the molten pool, increase the explosive splash, increase the fluidity of slag, deteriorate the forming, and increase the silicon content of the weld metal. The amount of medium-carbon ferromanganese is generally less than 8%. Excessive ferromanganese will increase the amount of MnO, increase the basicity of slag, lead to poor fluidity of slag, poor weld formation, and difficulty in slag removal.

Mica: The main function of mica is to improve the pressure coating performance and slag formation of the coating, and help to improve arc stability, but because it contains crystal water, it will increase the hydrogenation of the weld metal. Mica has the following characteristics: 1) Corrosion resistance: Mica does not react with ordinary acid-base solutions, nor does it react with water, so it does not have a layer, no scaling, and no rupture. 2) Thermal properties: Since synthetic mica does not contain (OH) ^- , its high temperature resistance and thermal stability are much higher than those of natural mica, and synthetic mica can withstand temperatures above 1200°C. Decomposes slowly, and loses weight significantly above 1100°C; 3) Vacuum degassing performance: the vacuum degassing capacity of synthetic mica is low, and the trace gases released are only adsorbed gases such as O ₂ , N ₂ and Ar, as measured by mass spectrometer, because no H ₂ is released O steam is very suitable as an electrical vacuum insulation material, which will greatly improve the service life of vacuum devices; 4) The water content of synthetic mica is small, which is conducive to reducing hydrogen pores, thereby ensuring the strength of the weld.

Mixed rare earth can significantly improve the low temperature impact toughness of weld metal. Rare earth reacts with sulfur and oxygen in the process of welding metallurgy to produce rare earth sulfides, rare earth oxides and rare earth sulfur oxides, most of which float into the slag to effectively purify the weld; it can significantly improve the weld metal structure and refine Grain: It can significantly improve the shape, size and distribution of inclusions in the weld metal, reduce the number and size of inclusions.

Example 1

Step 1, putting industrial pure nickel with a mass ratio of 65%, ores containing C, Si, Ti, Nb, N, and Fe, Mo, Cr, and Mn together in an induction furnace for smelting, when all industrial pure nickel is melted, When the molten steel temperature reaches 1450°C, when the molten steel is calm, power off to cool and exhaust for 15 minutes, then power on for heating and refining for 15 minutes, and when the temperature continues to drop to the tapping temperature, the steel is tapped, and the furnace is filled with argon gas 5 minutes before tapping. The pressure in the furnace reaches 40KPa, and then add Mn to the molten steel and stir for 2 minutes before tapping. The tapping temperature is 1450°C. When pouring, the surface of the molten steel is required to be calm, pour evenly, and cool to room temperature to obtain steel ingots. During the smelting process, control 0.01% C, 0.5% Mn, 0.2% Si, 21% Cr, 2.5% Fe, 8.5% Mo, 0.02% Ti, 4% Nb, 0.15% N, S<0.01%, P< 0.01%, the balance is Ni, and the sum of the mass percentages of the above-mentioned components is 100%;

盘条后机械剥壳，再在耐酸混凝土酸洗池中用体积浓度为15%的盐酸洗15min后采用链条式烘干炉在145℃烘干，烘干速度为2m/s，用回转式拉丝机进行干法拉丝后卷取，将卷取的焊丝加热至670℃后自然冷却至室温后用回转式拉丝机再次干法拉丝，缠绕成直径为4.0mm的焊丝，即焊芯；Step 2, after peeling the steel ingot obtained in step 1, forge it into a billet with a 750kg steam hammer, remove the black skin and cracks on the surface of the billet after cooling to room temperature, and cut off the riser, and then use a rolling mill to roll the billet into

After the wire rod is mechanically peeled off, it is washed with hydrochloric acid with a volume concentration of 15% in the acid-resistant concrete pickling pool for 15 minutes, and then dried in a chain-type drying furnace at 145°C with a drying speed of 2m/s. After dry wire drawing by the machine, it is coiled, the coiled wire is heated to 670°C, cooled to room temperature naturally, and then dry wire is drawn again with a rotary wire drawing machine, and wound into a wire with a diameter of 4.0mm, that is, the welding core;

Step 3, take by weight respectively 44% marble, 22% fluorite, 4% zircon sand, 3% ferrosilicon, 6% ferrotitanium, 4% medium carbon ferromanganese, 5% Titanium dioxide, 5% rutile, 3% mica, 1% alkali, 3% mixed rare earth (a mixture of 20% yttrium oxide, 20% cerium oxide and 60% lanthanum oxide); the above powder materials Put 31% potassium sodium mixed water glass of the above-mentioned medicinal powder material together into a blender and mix for 15 minutes, then put the mixed medicinal powder into a compactor and press into a cylindrical medicinal mass;

Step 4, add the cylindrical drug ball prepared in step 3 to the welding rod press coater, and press-coat the cylindrical drug ball on the welding core prepared in step 2, and then put it into a box furnace at a low temperature of 60 ° C ×10h, and then step by step heating and drying at high temperature of 120°C×1h, 180°C×1h, 250°C×1h, 350°C×1h to make welding rods. Table 1 shows the comparison of the mechanical properties and technological properties of the deposited metal between this electrode and the imported electrode OK92.55.

Table 1 Mechanical properties and process properties of electrode deposited metal

The metallographic structure diagram of the deposited metal of the electrode produced in Example 1 of the present invention is shown in FIG. 1 . It can be seen from Figure 1 that the structure is mainly single austenite, which is mainly composed of γ-phase solid solution and precipitated phase, and the crystallization form is dendrite, which has a certain directionality, and dendrite occurs during the crystallization process Segregation or grain boundary segregation, so it has good low temperature toughness.

Example 2

Step 1, putting industrial pure nickel with a mass ratio of 65%, ores containing C, Si, Ti, Nb, N, and Fe, Mo, Cr, and Mn together in an induction furnace for smelting, when all industrial pure nickel is melted, When the temperature of molten alloy steel reaches 1450°C, when the molten steel is calm, power off to cool and exhaust for 10 minutes, and then power on for heating and refining for 15 minutes. When the pressure in the furnace reaches 33KPa, add Mn to the molten steel and stir for 2 minutes before tapping. The tapping temperature is 1450°C. When pouring, the surface of the molten steel is required to be calm, pour evenly, and cool to room temperature to obtain steel ingots. During the smelting process, control 0.02% C, 0.7% Mn, 0.25% Si, 22% Cr, 2.5% Fe, 9% Mo, 0.03% Ti, 4% Nb, 0.17% N, S<0.01%, P< 0.01%, the balance is Ni, and the sum of the mass percentages of the above-mentioned components is 100%;

盘条后机械剥壳，再在耐酸混凝土酸洗池中用体积浓度为15%的盐酸洗20min后采用链条式烘干炉在155℃烘干，烘干速度为1.5m/s，用回转式拉丝机进行干法拉丝后卷取，将卷取的焊丝加热至675℃后自然冷却至室温后用回转式拉丝机再次干法拉丝，缠绕成直径为4.0mm的焊丝，即焊芯；Step 2, after peeling the steel ingot obtained in step 1, forge it into a billet with a 750kg steam hammer, remove the black skin and cracks on the surface of the billet after cooling to room temperature, and cut off the riser, and then use a rolling mill to roll the billet into

After the wire rod is mechanically peeled off, it is washed with hydrochloric acid with a volume concentration of 15% in the acid-resistant concrete pickling pool for 20 minutes, and then dried in a chain-type drying furnace at 155°C with a drying speed of 1.5m/s. The wire drawing machine is dry-drawn and then coiled. The coiled welding wire is heated to 675°C, cooled to room temperature naturally, and then dry-drawn again with a rotary wire drawing machine, and wound into a welding wire with a diameter of 4.0mm, that is, the welding core;

Step 3, take by weight respectively 42% marble, 21% fluorite, 4% zircon sand, 2% ferrosilicon, 8% ferrotitanium, 5% medium carbon ferromanganese, 4% Titanium dioxide, 5% rutile, 5% mica, 1% alkali, 3% mixed rare earth (a mixture of 20% yttrium oxide, 20% cerium oxide and 60% lanthanum oxide); the above powder materials Put 31% potassium sodium mixed water glass of the above-mentioned medicinal powder material together into a blender and mix for 15 minutes, then put the mixed medicinal powder into a compactor and press into a cylindrical medicinal mass;

Step 4, add the cylindrical drug ball prepared in step 3 to the welding rod press coater, and press-coat the cylindrical drug ball on the welding core prepared in step 2, and then put it into a box furnace at a low temperature of 60 ° C ×10h, and then step by step heating and drying at high temperature of 120°C×1h, 180°C×1h, 250°C×1h, 350°C×1h to make welding rods. Table 2 shows the comparison of the mechanical properties and technological properties of the deposited metal between this electrode and the imported electrode OK92.55.

Table 2 Mechanical properties and process properties of electrode deposited metal

Example 3

Step 1, putting industrial pure nickel with a mass ratio of 65%, ores containing C, Si, Ti, Nb, N, and Fe, Mo, Cr, and Mn together in an induction furnace for smelting, when all industrial pure nickel is melted, The temperature of the molten alloy steel reaches 1450°C. When the molten steel is calm, turn off the power to cool and exhaust for 20 minutes, and then turn on the power for heating and refining for 20 minutes. When the temperature continues to drop to the tapping temperature, the steel is tapped. When the pressure in the furnace reaches 47KPa, add Mn to the molten steel and stir for 2 minutes before tapping. The tapping temperature is 1450°C. When pouring, the surface of the molten steel is required to be calm, pour evenly, and cool to room temperature to obtain steel ingots. During the smelting process, control 0.03% C, 0.7% Mn, 0.2% Si, 23% Cr, 3.0% Fe, 9.5% Mo, 0.03% Ti, 4.5% Nb, 0.2% N, S<0.01%, P< 0.01%, the balance is Ni, and the sum of the mass percentages of the above-mentioned components is 100%.

盘条后机械剥壳，再在耐酸混凝土酸洗池中用体积浓度为15%的盐酸洗10min后采用链条式烘干炉在148℃烘干，烘干速度为2.5m/s，用回转式拉丝机进行干法拉丝后卷取，将卷取的焊丝加热至680℃后自然冷却至室温后用回转式拉丝机再次干法拉丝，缠绕成直径为4.0mm的焊丝，即焊芯；Step 2, after peeling the steel ingot obtained in step 1, forge it into a billet with a 750kg steam hammer, remove the black skin and cracks on the surface of the billet after cooling to room temperature, and cut off the riser, and then use a rolling mill to roll the billet into

After the wire rod is mechanically peeled off, it is washed with hydrochloric acid with a volume concentration of 15% in the acid-resistant concrete pickling tank for 10 minutes, and then dried in a chain-type drying furnace at 148°C with a drying speed of 2.5m/s. The wire drawing machine is coiled after dry drawing, the coiled welding wire is heated to 680°C, cooled to room temperature naturally, and then dry drawn again with a rotary wire drawing machine, and wound into a welding wire with a diameter of 4.0mm, that is, the welding core;

Step 3, take by weight respectively 39% marble, 20% fluorite, 6% zircon sand, 1.2% ferrosilicon, 10% ferrotitanium, 5% medium carbon ferromanganese, 5% Titanium dioxide, 5% rutile, 6% mica, 0.8% alkali, 2% mixed rare earth (a mixture of 20% yttrium oxide, 20% cerium oxide and 60% lanthanum oxide); the above powder materials Put 31% potassium sodium mixed water glass of the above-mentioned medicinal powder material together into a blender and mix for 15 minutes, then put the mixed medicinal powder into a compactor and press into a cylindrical medicinal mass;

Step 4, add the cylindrical drug ball prepared in step 3 to the welding rod press coater, and press-coat the cylindrical drug ball on the welding core prepared in step 2, and then put it into a box furnace at a low temperature of 60 ° C ×10h, and then step by step heating and drying at high temperature of 120°C×1h, 180°C×1h, 250°C×1h, 350°C×1h to make welding rods. Table 3 shows the comparison of the mechanical properties and technological properties of the deposited metal between this electrode and the imported electrode OK92.55.

Table 3 Mechanical properties and process properties of electrode deposited metal

Example 4

Step 1, putting industrial pure nickel with a mass ratio of 65%, ores containing C, Si, Ti, Nb, N, and Fe, Mo, Cr, and Mn together in an induction furnace for smelting, when all industrial pure nickel is melted, The temperature of the molten alloy steel reaches 1450°C. When the molten steel is calm, cut off the power to cool and exhaust for 17 minutes, and then turn on the power for heating and refining for 25 minutes. When the temperature continues to drop to the tapping temperature, the steel is tapped. When the pressure in the furnace reaches 43KPa, add Mn to the molten steel and stir for 2 minutes before tapping. The tapping temperature is 1450°C. When pouring, the surface of the molten steel is required to be calm, pour evenly, and cool to room temperature to obtain steel ingots. During the smelting process, control 0.02% C, 0.9% Mn, 0.4% Si, 24% Cr, 3.0% Fe, 9.5% Mo, 0.03% Ti, 4.5% Nb, 0.2% N, S<0.01%, P< 0.01%, the balance is Ni, and the sum of the mass percentages of the above-mentioned components is 100%;

Step 2, after peeling the steel ingot obtained in step 1, forge it into a billet with a 750kg steam hammer, remove the black skin and cracks on the surface of the billet after cooling to room temperature, and cut off the riser, and then use a rolling mill to roll the billet into After the wire rod is mechanically peeled off, it is washed with hydrochloric acid with a volume concentration of 15% in the acid-resistant concrete pickling pool for 13 minutes, and then dried in a chain-type drying furnace at 152°C with a drying speed of 2.2m/s. The wire drawing machine is dry-drawn and then coiled. The coiled welding wire is heated to 677°C, cooled to room temperature naturally, and then dry-drawn again with a rotary wire drawing machine, and wound into a welding wire with a diameter of 4.0mm, that is, the welding core;

Step 3, take by weight 38% marble, 19% fluorite, 6% zircon sand, 1% ferrosilicon, 12% ferrotitanium, 5% medium carbon ferromanganese, 5% Titanium dioxide, 5% rutile, 6% mica, 1% alkali, 2% mixed rare earth (a mixture of 20% yttrium oxide, 20% cerium oxide and 60% lanthanum oxide); the above powder materials Put into the mixer together with 33% potassium sodium mixed water glass of the above-mentioned medicine powder material and mix for 15 minutes, then put the mixed medicine powder into a ball press and press into a cylindrical medicine ball;

Step 4, add the cylindrical drug ball prepared in step 3 to the welding rod press coater, and press-coat the cylindrical drug ball on the welding core prepared in step 2, and then put it into a box furnace at a low temperature of 60 ° C ×10h, and then step by step heating and drying at high temperature of 120°C×1h, 180°C×1h, 250°C×1h, 350°C×1h to make welding rods. Table 4 shows the comparison of the mechanical properties and technological properties of the deposited metal between this electrode and the imported electrode OK92.55.

Table 4 Mechanical properties and process properties of electrode deposited metal

The metallographic structure diagram of the deposited metal of the electrode produced in Example 4 of the present invention is shown in FIG. 2 . It can be seen from Figure 2 that the structure is mainly single austenite, which is mainly composed of γ-phase solid solution and precipitated phase, and the crystallization form is dendrite, which has a certain directionality, and dendrite occurs during the crystallization process Segregation or grain boundary segregation, so it has good low temperature toughness.

The metallographic diagram of the cross-section of the deposited metal weld of the electrode produced in Example 4 of the present invention is shown in FIG. 3 . It can be seen from Figure 3 that the structure is mainly honeycomb structure, and the bright colored ones are the branches of dendrites, which is the typical morphology of the cross-section of columnar crystals. Due to the large temperature gradient in the weld area, the crystals grow branches laterally on the columnar crystal trunk, thus forming columnar dendrites and forming a smaller honeycomb shape, thereby improving the toughness of the welded joint.

Example 5

Step 1, putting industrial pure nickel with a mass ratio of 65%, ores containing C, Si, Ti, Nb, N, and Fe, Mo, Cr, and Mn together in an induction furnace for smelting, when all industrial pure nickel is melted, The temperature of the molten alloy steel reaches 1450°C. When the molten steel is calm, cut off the power to cool and exhaust for 18 minutes, and then turn on the power for heating and refining for 17 minutes. When the temperature continues to drop to the tapping temperature, the steel is tapped. The pressure in the furnace reaches 36KPa, and then add Mn to the molten steel and stir for 2 minutes before tapping. The tapping temperature is 1450°C. When pouring, the surface of the molten steel is required to be calm, pour evenly, and cool to room temperature to obtain steel ingots. During the smelting process, control 0.02% C, 0.7% Mn, 0.3% Si, 22% Cr, 3.5% Fe, 9% Mo, 0.04% Ti, 4.5% Nb, 0.18% N, S<0.01%, P< 0.01%, the balance is Ni, and the sum of the mass percentages of the above-mentioned components is 100%;

Step 2, after peeling the steel ingot obtained in step 1, forge it into a billet with a 750kg steam hammer, remove the black skin and cracks on the surface of the billet after cooling to room temperature, and cut off the riser, and then use a rolling mill to roll the billet into After the wire rod is mechanically peeled off, it is washed with hydrochloric acid with a volume concentration of 15% in the acid-resistant concrete pickling tank for 20 minutes, and then dried in a chain-type drying furnace at 146°C with a drying speed of 1.6m/s. The wire drawing machine is coiled after dry drawing, the coiled welding wire is heated to 680°C, cooled to room temperature naturally, and then dry drawn again with a rotary wire drawing machine, and wound into a welding wire with a diameter of 4.0mm, that is, the welding core;

Step 3, take by weight respectively 34% marble, 24% fluorite, 6% zircon sand, 4% ferrosilicon, 12% ferrotitanium, 5% medium carbon ferromanganese, 5% Titanium dioxide, 5% rutile, 2% mica, 0.7% alkali, 2.3% mixed rare earth (a mixture of 20% yttrium oxide, 20% cerium oxide and 60% lanthanum oxide); the above powder materials Put into the mixer together with 33% potassium sodium mixed water glass of the above-mentioned medicine powder material and mix for 15 minutes, then put the mixed medicine powder into a ball press and press into a cylindrical medicine ball;

Step 4, add the cylindrical drug ball prepared in step 3 to the welding rod press coater, and press-coat the cylindrical drug ball on the welding core prepared in step 2, and then put it into a box furnace at a low temperature of 60 ° C ×10h, and then step by step heating and drying at high temperature of 120°C×1h, 180°C×1h, 250°C×1h, 350°C×1h to make welding rods.

Example 6

Step 1, putting industrial pure nickel with a mass ratio of 65%, ores containing C, Si, Ti, Nb, N, and Fe, Mo, Cr, and Mn together in an induction furnace for smelting, when all industrial pure nickel is melted, The temperature of the molten alloy steel reaches 1450°C. When the molten steel is calm, turn off the power to cool and exhaust for 20 minutes, and then turn on the power for heating and refining for 23 minutes. When the temperature continues to drop to the tapping temperature, the steel is tapped. The pressure in the furnace reaches 38KPa, and then add Mn to the molten steel and stir for 2 minutes before tapping. The tapping temperature is 1450°C. When pouring, the surface of the molten steel is required to be calm, pour evenly, and cool to room temperature to obtain steel ingots. During the smelting process, control 0.01% C, 0.8% Mn, 0.4% Si, 23% Cr, 2.5% Fe, 9% Mo, 0.03% Ti, 4% Nb, 0.15% N, S<0.01%, P< 0.01%, the balance is Ni, and the sum of the mass percentages of the above-mentioned components is 100%;

盘条后机械剥壳，再在耐酸混凝土酸洗池中用体积浓度为15%的盐酸洗12min后采用链条式烘干炉在151℃烘干，烘干速度为2.3m/s，用回转式拉丝机进行干法拉丝后卷取，将卷取的焊丝加热至672℃后自然冷却至室温后用回转式拉丝机再次干法拉丝，缠绕成直径为4.0mm的焊丝，即焊芯；Step 2, after peeling the steel ingot obtained in step 1, forge it into a billet with a 750kg steam hammer, remove the black skin and cracks on the surface of the billet after cooling to room temperature, and cut off the riser, and then use a rolling mill to roll the billet into

After the wire rod is mechanically peeled off, it is washed with hydrochloric acid with a volume concentration of 15% in the acid-resistant concrete pickling tank for 12 minutes, and then dried in a chain-type drying furnace at 151°C with a drying speed of 2.3m/s. The wire drawing machine is dry-drawn and then coiled. The coiled welding wire is heated to 672°C, cooled to room temperature naturally, and then dry-drawn again with a rotary wire drawing machine, and wound into a welding wire with a diameter of 4.0mm, that is, the welding core;

Step 3, weigh 48% of marble, 21% of fluorite, 2% of zircon sand, 4% of ferrosilicon, 10% of ferrotitanium, 3% of medium carbon ferromanganese, 2% of Titanium dioxide, 2% rutile, 6% mica, 1% alkali, 1% mixed rare earth (a mixture of 20% yttrium oxide, 20% cerium oxide and 60% lanthanum oxide); the above powder materials Put into the mixer together with 33% potassium sodium mixed water glass of the above-mentioned medicine powder material and mix for 15 minutes, then put the mixed medicine powder into a ball press and press into a cylindrical medicine ball;

Step 4, add the cylindrical drug ball prepared in step 3 to the welding rod press coater, and press-coat the cylindrical drug ball on the welding core prepared in step 2, and then put it into a box furnace at a low temperature of 60 ° C ×10h, and then step by step heating and drying at high temperature of 120°C×1h, 180°C×1h, 250°C×1h, 350°C×1h to make welding rods.

Example 7

Step 1, putting industrial pure nickel with a mass ratio of 65%, ores containing C, Si, Ti, Nb, N, and Fe, Mo, Cr, and Mn together in an induction furnace for smelting, when all industrial pure nickel is melted, The temperature of the molten alloy steel reaches 1450°C. When the molten steel is calm, the power is turned off for cooling and exhausting for 18 minutes, and then the power is turned on for heating and refining for 22 minutes. When the temperature continues to drop to the tapping temperature, the steel is tapped. When the furnace reaches 45KPa, add Mn to the molten steel and stir for 2 minutes before tapping. The tapping temperature is 1450°C. When pouring, the surface of the molten steel is required to be calm, pour evenly, and cool to room temperature to obtain a steel ingot. During the smelting process, control 0.02% C, 0.6% Mn, 0.2% Si, 22% Cr, 3% Fe, 9% Mo, 0.03% Ti, 4% Nb, 0.2% N, S<0.01%, P<0.01 %, the balance is Ni, and the sum of the mass percentages of the above-mentioned components is 100%;

盘条后机械剥壳，再在耐酸混凝土酸洗池中用体积浓度为15%的盐酸洗15min后采用链条式烘干炉在155℃烘干，烘干速度为2m/s，用回转式拉丝机进行干法拉丝后卷取，将卷取的焊丝加热至676℃后自然冷却至室温后用回转式拉丝机再次干法拉丝，缠绕成直径为4.0mm的焊丝，即焊芯；Step 2, after peeling the steel ingot obtained in step 1, forge it into a billet with a 750kg steam hammer, remove the black skin and cracks on the surface of the billet after cooling to room temperature, and cut off the riser, and then use a rolling mill to roll the billet into

After the wire rod is mechanically peeled off, it is washed with hydrochloric acid with a volume concentration of 15% in the acid-resistant concrete pickling pool for 15 minutes, and then dried in a chain-type drying furnace at 155°C with a drying speed of 2m/s. After dry wire drawing by the machine, it is coiled, the coiled wire is heated to 676°C, cooled to room temperature naturally, and then dry-drawed again with a rotary wire drawing machine, and wound into a wire with a diameter of 4.0mm, that is, the welding core;

Step 3, take by weight respectively 48% marble, 17% fluorite, 5% zircon sand, 3% ferrosilicon, 5% ferrotitanium, 5% medium carbon ferromanganese, 4% Titanium dioxide, 5% rutile, 5% mica, 0.8% alkali, 2.2% mixed rare earth (a mixture of 20% yttrium oxide, 20% cerium oxide and 60% lanthanum oxide); the above powder materials Put into the mixer together with 33% potassium sodium mixed water glass of the above-mentioned medicine powder material and mix for 15 minutes, then put the mixed medicine powder into a ball press and press into a cylindrical medicine ball;

Step 4, add the cylindrical drug ball prepared in step 3 to the welding rod press coater, and press-coat the cylindrical drug ball on the welding core prepared in step 2, and then put it into a box furnace at a low temperature of 60 ° C ×10h, and then step by step heating and drying at high temperature of 120°C×1h, 180°C×1h, 250°C×1h, 350°C×1h to make welding rods.

Claims (8)

1.1Ni9 the low hydrogen basic electrode is used in the low-temperature steel welding, it is characterized in that, comprises core wire and coating, described core wire is composed of the following components by mass percentage: carbon 0.01%-0.03%, manganese 0.5%-0.9%, silicon 0.2%-0.4%, chromium 21%-24%, iron 2.5%-3.5%, molybdenum 8.5%-9.5%, titanium 0.02%-0.04%, niobium 4%-4.5%, nitrogen 0.15%-0.20%, sulphur<0.01%, phosphorus<0.01%, surplus is nickel, above-mentioned each constituent mass percentage sum is 100%; Described coating is composed of the following components by mass percentage: the marble of 34%-48%, the fluorite of 17%-24%, the zircon sand of 2%-6%, the ferrosilicon of 1%-4%, the ferrotianium of 5%-12%, the mid-carbon fe-mn of 3%-5%, the titanium dioxide of 2%-5%, the rutile of 2%-5%, the mica of 2%-6%, the alkali of 0.7%-1%, the mishmetal of 1%-3%, above-mentioned each component matter percentage by weight sum is 100%.

2.1Ni9 the preparation method of low hydrogen basic electrode for the low-temperature steel welding, is characterized in that, comprises the following steps:

Step 1,

The industrial pure ni that is 65% by mass ratio, containing C, Si, Ti, Nb, the ore of N and Fe, Mo, Cr, Mn puts into together induction furnace and is smelted, when industrial pure ni all melts, the steel alloy liquid temp reaches 1450 ℃, when molten steel is tranquil, the power failure coolant exhaust, power transmission is added heat refining again, when continuing to drop to tapping temperature, temperature taps, before tapping, 5min first makes pressure in stove reach 33-47KPa to applying argon gas in stove, after adding in molten steel Mn to stir 2min, tap again, 1450 ℃ of tapping temperatures, during cast, require the molten steel surface tranquil, cast evenly, be cooled to room temperature and obtain steel ingot, make the percentage by weight of steel ingot be: carbon 0.01%-0.03%, manganese 0.5%-0.9%, silicon 0.2%-0.4%, chromium 21%-24%, iron 2.5%-3.5%, molybdenum 8.5%-9.5%, titanium 0.02%-0.04%, niobium 4%-4.5%, nitrogen 0.15%-0.20%, sulphur<0.01%, phosphorus<0.01%, surplus is nickel, the mass percent sum of above-mentioned each component is 100%,

Step 2,

Steam hammer with 750kg after the ingot scalping that described step 1 is obtained is forged into square billet, is cooled to after room temperature to remove square billet surface casting skin and crackle and cut to begin to crop up, and then with milling train, billet rolling is become

mechanical descaling after wire rod, then carry out the pickling post-drying of derusting in the acid-resisting concrete pickling tube, carry out batching after dry wire drawing with the swinging wire drawing machine, after heat treatment, by swinging wire drawing machine dry wire drawing again, is wound in the welding wire that diameter is 4.0mm, i.e. core wire;

Step 3,

Take respectively the marble of 34%-48% according to mass percent, the fluorite of 17%-24%, the zircon sand of 2%-6%, the ferrosilicon of 1%-4%, the ferrotianium of 5%-12%, the mid-carbon fe-mn of 3%-5%, the titanium dioxide of 2%-5%, the rutile of 2%-5%, the mica of 2%-6%, the alkali of 0.7%-1%, the mishmetal of 1%-3%, the mass percent sum of above-mentioned each component is 100%; Above-mentioned coating material is put into to batch mixer together with binding agent and mix, then mixed medicinal powder is put into to balling press and be pressed into cylindrical medicine group;

Step 4,

The cylindrical medicine group that adds described step 3 to make in electrode extrusion press, and, on the core wire that cylindrical medicine group extrusion is made in described step 2, then put into batch-type furnace and carry out the cascade raising temperature oven dry, welding rod obtained.

3. the 1Ni9 low-temperature steel welds the preparation method with the low hydrogen basic electrode as claimed in claim 2, it is characterized in that, the time of coolant exhaust described in step 1 is 10-20min, and described heating refining time is 15-25min.

4. the 1Ni9 low-temperature steel welds the preparation method with the low hydrogen basic electrode as claimed in claim 2, it is characterized in that, pickling described in step 2 adopts the hydrochloric acid that volumetric concentration is 15%, and pickling time is 10-20min.

5. the 1Ni9 low-temperature steel welds the preparation method with the low hydrogen basic electrode as claimed in claim 2, it is characterized in that, described in step 2, dries and adopts the chain-type drying oven, and bake out temperature is 145-150 ℃, and drying rate is 1.5-2.5m/s.

6. the preparation method of low hydrogen basic electrode for 1Ni9 low-temperature steel welding as claimed in claim 2, is characterized in that, heat treatment described in step 2 is to naturally cool to room temperature after the welding wire that will batch is heated to 670-680 ℃.

7. the 1Ni9 low-temperature steel welds the preparation method with the low hydrogen basic electrode as claimed in claim 2, it is characterized in that, the binding agent of medicinal powder described in step 3 is potassium sodium mixing water glass, the 30%-33% that addition is the coating quality.

8. the 1Ni9 low-temperature steel welds the preparation method with the low hydrogen basic electrode as claimed in claim 2, it is characterized in that, the oven dry of cascade raising temperature described in step 4 concrete steps are: first with 60 ℃ of low temperature baking 10h, then dry 1h, 180 ℃ of oven dry 1h, 250 ℃ of oven dry 1h, 350 ℃ of oven dry 1h with 120 ℃ successively.

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