CN102528324B - Method for preparing alloy powder for manufacturing tubular welding wire - Google Patents
Method for preparing alloy powder for manufacturing tubular welding wire Download PDFInfo
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- CN102528324B CN102528324B CN201210014701.1A CN201210014701A CN102528324B CN 102528324 B CN102528324 B CN 102528324B CN 201210014701 A CN201210014701 A CN 201210014701A CN 102528324 B CN102528324 B CN 102528324B
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Abstract
The invention belongs to the technical field of welding, in particular to alloy powder for manufacturing a tubular welding wire and a preparation method of the tubular welding wire. In the invention, according to the alloy phase change theory, the prefabricated alloy powder formula is changed, so that the repeatability and stability of alloying component in the batch production of the prefabricated alloy powder can be improved greatly. In the invention, the improved melting and pouring process of producing metal powder by being atomized by high pressure water is adopted, and the uniformity of the alloying components of the prefabricated alloy powder can be ensured. A method of test panel overlaying welding, welding layer component detection and heat cracking resistance test is adopted for checking the uniformity and good heat cracking resistance performance of components of an intermediate alloy tube wire overlaying layer prepared by the prefabricated powder. The tube wire product developed by the method of the invention is adopted and is matched with corresponding welding flux, the overlaying welding of physical rolls such as cold-heat pinch rolls, support rolls and vertical rolls shows that during the overlaying welding process, little fume is produced, the slag detachability is good, the welding pass forming property is good, pores and cracks do not exist on the overlaying layer and a crust, and the welding quality and the service life completely meet the engineering requirements.
Description
Technical field
The invention belongs to welding technology field, be specifically related to a kind of alloyed powder that flux cored wire uses and preparation method thereof of manufacturing.
Background technology
Traditional submerged-arc welding alloy tube wire is to adopt conventional mixed type alloy tube wire, and preparing the alloy powder that alloy tube wire uses is to prepare various alloy powders by a pipe silk component prescription, adopts mixing tank carry out mechanical mixture and obtain.This method be difficult to be eliminated the layer uneven components that the difference of specific gravity due to formula alloy material causes.
And the technique of prealloy powder manufacture pipe silk, first pipe silk alloy formula is adopted to non-vacuum induction furnace melting, in fusion process, the electromagnetic stirring force that especially refining period, induction furnace produced stirs the metal bath of prealloy, thereby guarantees the alloying component uniformity of prealloy powder.Purposes according to flux cored wire for submerged arc overlay welding technique, the present invention has designed the alloy formula of the pearlite heat-resistance stainless steel of Cr5 series, in development process, run into prealloy composition and in batch production process, be difficult to the stable reproduction that is difficult for, induction furnace furnace lining is short service life, prealloy liquation easily stops up the problems such as ladle graphite crucible passage in cast water atomization process, in order to overcome above-mentioned drawback, in applicant's labor Cr5 alloy system, C, Mn, Si, Cr, Mo, V, in the alloying elements such as W, especially C, Mn, S point (eutectoid point carbon part point) in the phase transformation of tri-kinds of element alloy iron carbon of Si, E point (the high-carbon part point of austenite), C point (eutectic point) and A1(eutectoid temperature), A3(eutectic temperature) impact is maximum, in order to stablize and reappear alloying component in prealloy production process from now on, first emphasis is determined C, Mn, the amount of allocating into of Si and rationally definite, Cr, Mo, V, the amount of allocating into of W (optimum formula design) solves prealloy ingredient stability and reappearance, next transforms the melting of traditional hydraulic atomized production alloy powder, the techniques such as cast, adopt bulk alloy material, determine the buying technical standard (mainly determining that permitting of alloying component can scope) of bulk alloy material, by contrast smelting trial, select basic lining, can extend furnace lining service life: adopt and control tapping temperature in refining period (to 1580 ℃) and drag for most scum silica frost and the technical measures of 600 ℃ of steel ladle pouring mouth preheatings, guarantee that prealloy liquid pours into a mould smoothly, do not stop up crucible.
Applicant is in order to verify the superiority of prealloy pipe silk technique, composition and the performance of the overlay cladding of the flux cored wire that prealloy powder is manufactured (claiming intermediate alloy pipe silk) detect, found that intermediate alloy pipe silk overlay cladding alloying component is even, and there is good cracking resistance energy.
It is the 324M pipe silk of HRC48-50 and the 324L pipe thread that layer hardness is HRC41-43 that the prealloy powder that applicant refines Cr5 alloy series is used for respectively rolling hardness, success surfacing roll diameter is from the branched roller footpath of Φ 500mm to Φ 1400mm different pinch roll and backing roll, intermediate alloy pipe silk bead-welding technology performance and layer good mechanical properties.
Summary of the invention
The object of the present invention is to provide a kind of layer composition that can make full and uniform, thereby can improve alloyed powder of alloy tubulose Quality of Final Welding Wire and preparation method thereof.
The preparation method of the alloyed powder that the present invention proposes, the pipe silk product ovality that combines traditional uniform technical characterstic of hydraulic atomized explained hereafter metal dust alloying component and the production of conventional pipe silk rolling mill practice is little, alloying component densification and the high technical advantage of production efficiency, the method that employing is learnt from other's strong points to offset one's weaknesses, the alloyed powder that the uniform prealloy powder of hydraulic atomized explained hereafter alloying component is replaced to the mixing tank mechanical mixture of conventional mixed type pipe silk, be supplied to pipe silk production line, through rolling and drawing process, finally make layer composition uniformly and the good intermediate alloy pipe silk of overlay cladding cracking resistance.
The present invention is under steel alloy phase transformation theory instructs, through tens stove formula smelting process tests, continue to optimize prealloy powder formula Design, to C, Mn, Si, Cr, Mo, V, the W seven element amounts of allocating into determine, sum up strengthening C, Mn, Si three elements is rationally allocated (suitable low C, Si and suitable high Mn) into and adopted bulk alloy material, by technical standard, purchases alloy raw material; Select basic lining, extend stove service life; Improve tapping temperature in refining period (to 1580 ℃) and drag for most scum silica frost and the technical measures of 600 ℃ of steel ladle pouring mouth preheatings etc., the carrying out smoothly and guarantee that prealloy composition and quality are substantially good of assurance prealloy powder production process.
The preparation method of the prealloy powder that the present invention proposes, adopts non-vacuum induction furnace furnace lining; C, Mn, Si, Cr, Mo, V, the component formula of W seven elements is by weight percentage:
C ： 1.5-2.0%
Mn ： 8.5-10.5%
Si ： 1-1.6%
Cr ： 25-30%
Mo ： 3.5-4.5%
W ： 3.5-4.5%
V ： 0.8-1.6%
All the other are iron.Total amount is 100%.
Smelting technology parameter is as follows:
Alternating voltage: 415 ~ 420V;
DC voltage: 400 ~ 415V;
DC current: 120 ~ 200A;
Voltage of intermediate frequency: 600 ~ 620V;
IF-FRE (Hz): 750 ~ 800 (Hz);
Smelter flowsheet is:
Before blow-on, add whole iron (concrete available scrap iron and steel), ferrotungsten, carbon dust and vanadium iron, and half low-carbon ferrochromium;
Indirect current:
Switch on 25 ~ 30 minutes time, add second half low-carbon ferrochromium;
Switch on 30 ~ 35 minutes time, add monocrystalline silicon;
Switch on 35 ~ 50 minutes time, add whole molybdenum-iron;
Switch on 50 ~ 55 minutes time, add electrolytic manganese;
Switch on 55 ~ 60 minutes time, add silico-calcium, deoxidation;
Switch on 60 ~ 65 minutes time, have a power failure, drag for slag, in 4 ~ 5 minutes, drag for most scum silica frost;
Strengthen energising power: logical direct current: 180 ~ 200A, heat 8 ~ 12 minutes, when furnace temperature rises to 1550 ℃ ~ 1600 ℃, have a power failure, open water under high pressure (hydraulic pressure is generally 90 ~ 110 atmospheric pressure), carry out hydraulic atomized cast, obtain water atomization alloyed powder.
In above-mentioned technique, described ferrotungsten, vanadium iron, ferrochrome, molybdenum-iron, is tungsten, vanadium, chromium, the raw alloy of molybdenum; The consumption of these raw alloys, according to the content of elemental tungsten, vanadium, chromium, molybdenum in raw alloy, and elemental tungsten, vanadium, chromium, the consumption of molybdenum in filler alloys powder, calculate.
The present invention is by the intermediate alloy pipe silk built-up welding test plate (panel) of the various different-thickness of composting, detect respectively the overlay cladding alloying component of various thickness, find overlay cladding alloying component with its layer varied in thickness rule, with the uniformity of actual product formal verification intermediate alloy pipe silk overlay cladding alloying component.The present invention introduces the technical experience of Ministry of Aerospace Industry's thermal cycling screening material, identical to two kinds of alloying components, but adopt respectively alkalescence identical with alloying component with two kinds of intermediate alloy pipe silks of acid lining refining, but the pipe silk overlay cladding of mixed type technique rolling carries out the strong contrast test of heat resistanceheat resistant routinely, result of the test finds that intermediate alloy pipe silk overlay cladding has good cracking resistance energy.
(1), intermediate alloy pipe silk overlay cladding has unique alloying component uniformity.
With seven layers of built-up welding of the intermediate alloy pipe silk of stove lot number 08#, its overlay cladding thickness is the large test plate (panel) of 15 millimeters, be step and get 10 millimeters, 8 millimeters and 6 millimeters of three thickness levels and three different parts of each level (not every 75 millimeters, 150 millimeters, the distance of 225 millimeters) materials, i.e. three aspects, 3 positions of each aspect, the actual measurement layer of totally 9 tests is example, measured result is as follows
。
(2) intermediate alloy pipe silk overlay cladding has good cracking resistance
3 close built-up welding test plate (panel)s of layer alloying component are carried out to following thermal shock resistance test simultaneously: three test plate (panel)s are put into resistance furnace simultaneously, be heated to 1000 ℃ of insulations 2 hours, take out test plate (panel) and put into rapidly three water tanks, carrying out 1000 ℃ of above rapid heat cycles of the temperature difference processes, after slow test plate (panel) such as grade is fully cooling, check whether test plate (panel) surface cracks (dye penetrant inspection), the rapid heat cycle number of times before cracking with test plate (panel) overlay cladding represents the quality of its cracking resistance.The numbering of three test plate (panel)s is respectively the test plate (panel) of 0# basic lining refining intermediate alloy pipe silk composting; 1# is the test plate (panel) of the intermediate alloy pipe silk composting of acid lining refining; 2# is the test plate (panel) of conventional mixed type pipe silk composting.
The result of thermal crack resistant test is as follows:
0# test plate (panel) is through six thermal cyclings, and crackle does not appear in overlay cladding surface;
1# test plate (panel) is through three thermal cyclings, and two micro-cracks appear in overlay cladding surface;
2# test plate (panel) is through secondary thermal cycling, and numerous crackles appear in overlay cladding surface;
Above-mentioned result of the test shows: the intermediate alloy pipe silk overlay cladding especially intermediate alloy pipe silk overlay cladding of basic lining refining has good heat crack resistance.
In embodiment, the flux cored wire product that the prealloy powder of the present invention's refining successfully produces two kinds of Cr5 alloy series is 324M and 324L product.
(1) 324M pipe silk, 3.2 millimeters of its pipe filament diameter Φ, material ratio 27%, coupling SSD-II solder flux.Surfacing hardness HRC48-50.
Overlay cladding composition:
| C | Mn | Si | Cr | Mo | V | W |
| 0.17-0.19 | 0.95-1.05 | 0.55-0.7 | 4.5-4.7 | 1.0-1.1 | 0.15-0.2 | 0.6-0.8 |
324M pipe silk+SSD-II solder flux can be used for Technology of Welded Roller footpath Φ 1000-1400 millimeter, the bead-welding technology of the medium-sized cold and hot backing roll pinch roll of monolateral built-up welding bed thickness 30-50 millimeter and edger roll etc.
(2) 324L pipe silk, 4 millimeters of pipe filament diameter Φ, material ratio 31%, coupling SSD-II solder flux, built-up welding hardness HRC41-45.
Built-up welding composition:
| C | Mn | Si | Cr | Mo | V | W |
| 0.10-0.13 | 0.95-1.05 | 0.6-0.7 | 4.4-5.0 | 1.0-1.2 | 0.2-0.25 | 0.8-1.0 |
324L pipe silk+SSD-II solder flux can be used for the bead-welding technology of large-scale supporting roller and pinch roll.
The feature (comprehensively) of prealloy powder of the present invention and intermediate alloy pipe silk
1, the optimum formula by alloying component designs, adopt by the bulk alloy material of buying technical standard (alloying component permit can scope), select basic lining, the measures such as 600 ℃ of preheatings of stablizing process for making and improving cast tapping temperature and steel ladle pouring, can guarantee that prealloy powder production process carries out reappearance and the stability with prealloy composition smoothly.
2, intermediate alloy pipe silk overlay cladding alloying component is stable, and layer heat crack resistance is good, for adopting the various rolls of intermediate alloy pipe silk composting, can obviously reduce the risk of roll crown cracking, improves the success rate of bead-welding technology.
3, the present invention, through great many of experiments, has obtained about the various tempering heat treatment process of intermediate alloy pipe silk overlay cladding and the relation curve between surfacing hardness, and concrete data are as follows:
As can be seen here, intermediate alloy pipe silk overlay cladding is through 520 ℃ of temper, and roll surface roll surface hardness number is for the highest.User adopts roll and the roll surface much higher hard of intermediate alloy pipe silk built-up welding, can adopt 550 ℃ and 480 ℃ of tempering heat treatment process, roll surface hardness is suitably finely tuned, thus the risk of reduction bead-welding technology.
The specific embodiment
The invention is further illustrated by the following examples.
Embodiment 1:
Take stove lot number 10# as example explanation prealloy powder smelting technology and powder process operation
1, furnace lining: non-vacuum induction furnace furnace lining;
2, melting weight 120Kg;
3, smelting technology parameter:
Alternating voltage: 415 ~ 420V;
DC voltage: 400 ~ 415V;
DC current: 120 ~ 200A;
Voltage of intermediate frequency: 600 ~ 620V;
IF-FRE (Hz): 750 ~ 800;
4, add furnace charge program and smelting technology flow process
Before blow-on, add whole steel scraps, ferrotungsten, carbon dust and vanadium iron, and half low-carbon ferrochromium;
Switch on and within 25 minutes, add second half low-carbon ferrochromium;
Switch on and within 30 minutes, add monocrystalline silicon;
Switch on and within 35 minutes, add whole molybdenum-iron;
Switch on and within 50 minutes, add electrolytic manganese;
Switch on and within 55 minutes, add silico-calcium deoxidation;
Switching on has a power failure for 60 minutes drags for slag, drags for most scum silica frost in 5 minutes;
Energising strengthened power heating about 10 minutes, surveyed furnace temperature and rose to 1580 ℃ of left and right, had a power failure, and opened water under high pressure (100 pressure), carried out hydraulic atomized pouring technology;
5, the alloyed powder that makes water fogging is poured iron plate electric furnace into, dries 200 ~ 250 ℃ * 2 hours;
6,60 ~ 250 order vibratory sieves sieve;
7,500Kg mixing tank closes to criticize and mixes inlet pipe silk production line making intermediate alloy pipe silk.
Embodiment 2
Continue to optimize prealloy Composition Design, or C is high or Si is high or Mn is low, all causes intermediate prefabricated alloy tube wire surfacing hardness higher, have C only, Si is suitably on the low side, and Mn is suitably higher, just can guarantee that intermediate alloy pipe silk obtains suitable surfacing hardness.
(1) take stove lot number 11# is example, C in alloying component formula is described, the higher impact of Si
(2) take stove lot number 12# is example, and the impact that Mn is higher is described in alloying component formula Design
3, take stove lot number 13# is example, illustrate in prealloy formula Design, and C, Si is suitably on the low side, and Mn is suitably higher, can guarantee that intermediate alloy pipe silk overlay cladding obtains suitable hardness number
Embodiment 3
The impact experiment in the corresponding induction furnace of induction furnace furnace lining type service life and refining period steel tapping casting temperature steel ladle pouring mouth congestion affects is tested.
1, same alloying component, adopts acid lining, and induction lining durability is 3 stoves only, and adopt basic lining, and induction lining durability can reach 58 stoves.
2, same prealloy composition, adopts basic lining equally, and refining period, steel tapping casting temperature was 1285 ℃, continuous pouring 3 stoves, and steel ladle pouring mouth stops up; And refining period 1585 ℃ of steel tapping casting mouth temperature, continuous pouring 18 stoves, steel ladle pouring mouth does not stop up.
Embodiment 4
Take that to inspect the Z324M of 2 stove lot numbers and Z324L pipe silk overlay cladding composition and hardness number by random samples be example, intermediate alloy pipe silk overlay cladding homogeneity of ingredients and the stability of prealloy powder manufacture be described.
1, Z324M pipe silk (coupling SSD solder flux)
2, Z324L pipe silk (coupling SSD solder flux)
Embodiment 5:
The prealloy powder of refining Cr5 alloy series is used for the 324M pipe silk that rolling layer hardness is HRC48-50, its bead-welding technology performance confirms through built-up welding, can be at various material (9Cr2Mo, 70Cr3Mo and 66CrNiMo) different roll kind (cold and hot backing rolls, rollcogging-roll, pinch roll and edger roll etc.) (Φ 500, and Φ 1000 in various differential rollers footpath, with 1100 millimeters of Φ etc.) roller surfacing technology in kind of various difference monolateral overlay cladding thickness (25,35 and 45 millimeters).Its removability of slag is good, automatic deslag continuously, and figuration of bead is good, and layer is without slag inclusion, and roll surface flawless, meets and produce actual technological requirement its service life.
Claims (1)
1. a preparation method who manufactures the alloyed powder that flux cored wire uses, is characterized in that adopting non-vacuum induction furnace furnace lining; C, Mn, Si, Cr, Mo, V, the component formula of W seven elements is by weight percentage:
C ； 1.5-2.0%
Mn ； 8.5-10.5%
Si ； 1-1.6%
Cr ； 25-30%
Mo ； 3.5-4.5%
W ； 3.5-4.5%
V ； 0.8-1.6%
All the other are iron; Total amount is 100%;
Smelting technology parameter is as follows:
Alternating voltage: 415 ~ 420V;
DC voltage: 400 ~ 415V;
DC current: 120 ~ 200A;
Voltage of intermediate frequency: 600 ~ 620V;
IF-FRE Hz:750 ~ 800Hz;
Smelter flowsheet is:
Before blow-on, add whole iron, ferrotungsten, carbon dust and vanadium iron, and half low-carbon ferrochromium;
Indirect current:
Switch on 25 ~ 30 minutes time, add second half low-carbon ferrochromium;
Switch on 30 ~ 35 minutes time, add monocrystalline silicon;
Switch on 35 ~ 50 minutes time, add whole molybdenum-iron;
Switch on 50 ~ 55 minutes time, add electrolytic manganese;
Switch on 55 ~ 60 minutes time, add silico-calcium, deoxidation;
Switch on 60 ~ 65 minutes time, have a power failure, drag for slag, in 4--5 minute, drag for most scum silica frost;
Strengthen energising power: logical direct current: 180 ~ 200A, heat 8 ~ 12 minutes, when furnace temperature rises to 1550 ℃ ~ 1600 ℃, have a power failure, open water under high pressure, hydraulic pressure is 90 ~ 110 atmospheric pressure, carries out hydraulic atomized cast, obtains water atomization alloyed powder;
In above-mentioned technique, described ferrotungsten, vanadium iron, ferrochrome, molybdenum-iron, is tungsten, vanadium, chromium, the raw alloy of molybdenum; The consumption of these raw alloys, according to the content of elemental tungsten, vanadium, chromium, molybdenum in raw alloy, and elemental tungsten, vanadium, chromium, the consumption of molybdenum in filler alloys powder, calculate;
Described non-vacuum induction furnace furnace lining is basic lining.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210014701.1A CN102528324B (en) | 2012-01-18 | 2012-01-18 | Method for preparing alloy powder for manufacturing tubular welding wire |
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| CN201210014701.1A CN102528324B (en) | 2012-01-18 | 2012-01-18 | Method for preparing alloy powder for manufacturing tubular welding wire |
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| CN102528324B true CN102528324B (en) | 2014-04-09 |
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| CN112921236A (en) * | 2021-01-14 | 2021-06-08 | 上海欣冈贸易有限公司 | Metal composition for high-strength welding |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB821822A (en) * | 1954-10-05 | 1959-10-14 | Energy Ltd | Improvements in and relating to heat engines operating on the stirling or ericsson heat cycles |
| CN1316311A (en) * | 2001-05-28 | 2001-10-10 | 宝山钢铁股份有限公司 | Hard-surface alloy wire for build-up welding roller surface |
| CN1413793A (en) * | 2002-10-09 | 2003-04-30 | 天津大学 | Repairing cold-rolled intermediat roll working lining build-up welding agent core welding stick |
| US6916444B1 (en) * | 2002-02-12 | 2005-07-12 | Alloy Technology Solutions, Inc. | Wear resistant alloy containing residual austenite for valve seat insert |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62259867A (en) * | 1986-05-07 | 1987-11-12 | Toshiba Corp | Printing wire for printer |
| CN1078512C (en) * | 1998-07-14 | 2002-01-30 | 王玉彬 | Special flux-cored wirecord for repairing continuous-casting roller |
-
2012
- 2012-01-18 CN CN201210014701.1A patent/CN102528324B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB821822A (en) * | 1954-10-05 | 1959-10-14 | Energy Ltd | Improvements in and relating to heat engines operating on the stirling or ericsson heat cycles |
| CN1316311A (en) * | 2001-05-28 | 2001-10-10 | 宝山钢铁股份有限公司 | Hard-surface alloy wire for build-up welding roller surface |
| US6916444B1 (en) * | 2002-02-12 | 2005-07-12 | Alloy Technology Solutions, Inc. | Wear resistant alloy containing residual austenite for valve seat insert |
| CN1413793A (en) * | 2002-10-09 | 2003-04-30 | 天津大学 | Repairing cold-rolled intermediat roll working lining build-up welding agent core welding stick |
Non-Patent Citations (2)
| Title |
|---|
| 新型系列硬面堆焊材料的研制及应用;王俊明;《机械工人》;20060531(第5期);33-37 * |
| 王俊明.新型系列硬面堆焊材料的研制及应用.《机械工人》.2006,(第5期),33-37. |
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