CN116121644B - A high-toughness mining circular saw blade steel plate and its manufacturing method - Google Patents
A high-toughness mining circular saw blade steel plate and its manufacturing method Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
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- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
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- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
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Abstract
The invention relates to a high-toughness mine disc saw blade steel plate and a production method thereof, wherein the chemical components of the steel plate contain ：C：0.47～0.52％,Si：0.40～0.60％,Mn：1.30～1.50％,V：0.08～0.12％,Al：0.03～0.06％,Cr：0.10～0.30％,P：≤0.012％,S：≤0.002％,Ca：0.0010～0.0030％,O：≤0.002％,N：≤0.004％,H：≤0.0002％, weight percent of Fe and unavoidable impurity elements as the rest. The production process comprises the steps of converter steelmaking- > LF refining- > VD or RH vacuum degassing- > Ca treatment- > continuous casting- > hot delivery- > heating- > rolling- > slow cooling- > quenching- > tempering of the steel plate. The thickness of the steel plate is less than or equal to 12mm, the width of the steel plate can reach 4000mm, the toughness of the steel plate is excellent, the impact Akv at 20 ℃ is more than or equal to 27J, and the hardness is 30-40 HRC. The saw blade can stably run within the temperature range of 400-500 ℃ and has longer service life.
Description
Technical Field
The invention belongs to the field of special steel smelting, and particularly relates to a high-toughness mine disc saw blade steel plate and a manufacturing method thereof.
Background
The steel for the mine disc saw blade is mainly used for cutting stone materials such as granite, marble and the like. In the cutting process, the saw blade can vibrate to a certain extent, so that the steel for the saw blade has high hardness and high wear resistance, and meanwhile, has excellent toughness for resisting impact load, and avoids brittle fracture such as tooth breakage. In addition, the steel for saw blades must have a certain heat resistance because a large amount of heat is generated during the rotation of the saw blade at a high speed and the working temperature is rapidly increased.
With the development of the steel industry in China, the production and application of the steel for the saw blade in China are gradually connected with the international rail in recent years. Chinese patent CN110284061a discloses a high temperature deformation resistant 75Cr1 saw blade steel and its production method. The carbon content of the alloy is 0.72-0.80%, needle martensite is easy to generate after quenching, and the alloy has high strength, good wear resistance and insufficient toughness. The hot rolling delivery of the invention adopts laminar cooling and curls at about 700 ℃. The hardness of the steel plate is less than or equal to 325HB, and the steel plate needs to be leveled and oil quenched before subsequent application, thereby increasing the application cost. Meanwhile, the steel for the large-diameter saw blade with the diameter of more than 3000mm cannot be produced due to the limitation of continuous rolling and crimping equipment.
Chinese patent CN105063478B discloses a 50Mn2V steel plate for saw blade and its production method. The steel plate is subjected to secondary cogging rolling by adopting a continuous casting blank, and the problem of flatness of the steel plate is solved by repeated straightening. The invention can only provide hot rolled semi-finished products, customers need to carry out subsequent heat treatment, and the use cost is increased.
Chinese patent CN104532150a discloses an ultra-wide saw blade steel and a method for manufacturing the same. According to the invention, 0.35-0.45% of medium carbon design is adopted, nb/V/Ti microalloying is combined, and meanwhile, noble metals such as Mo, ni and the like are added, so that the toughness of the steel plate is improved. In order to reduce the cost, the steel plate is produced in an online quenching and offline tempering mode, but the online quenching can lead to uneven head and tail performance of the steel plate and influence the service life of the saw blade.
Chinese patent CN113684421a discloses a method for producing steel for mine ultra-wide disc saw blade. The steel plate adopts a low-carbon design of 0.17-0.20%, and B element is added to increase the hardenability of the steel plate. The steel plate is quenched at 870 ℃ and tempered at a low temperature of 250-300 ℃ and has a tempered martensite structure. The invention is added with Cr/Mo/V and other elements, does not have heat resistance and tempering resistance, and can rapidly reduce the hardness of the saw blade when working above 300 ℃ to cause failure.
Currently, saw blade steels are gradually forming a high to low carbon range of products. The low-carbon steel can be quenched by water, has good toughness, but has poor heat resistance, and cannot be used at higher temperature. The medium and high carbon steel has high hardness and good wear resistance, but has the problems of poor toughness and easy cracking. Meanwhile, in order to avoid quenching cracking, a middle-high carbon saw blade steel factory is generally only used as a hot-rolled semi-finished product, customers carry out salt bath heating and oil quenching, the heat treatment process is complex, the cost is high, and oil smoke generated during oil quenching is not beneficial to environmental protection.
Disclosure of Invention
The technical problem to be solved by the invention is to provide the high-toughness mine disc saw blade steel plate and the manufacturing method thereof aiming at the prior art, wherein water quenching is directly adopted, and the cost is low and the environment protection is facilitated.
The technical scheme adopted by the invention for solving the problems is that the high-toughness mine disc saw blade steel plate comprises the following chemical components in percentage by mass C：0.47～0.52％,Si：0.40～0.60％,Mn：1.30～1.50％,V：0.08～0.12％,Al：0.03～0.06％,Cr：0.10～0.30％,P：≤0.012％,S：≤0.002％,Ca：0.0010～0.0030％,O：≤0.002％,N：≤0.004％,H：≤0.0002％, and the balance of Fe and unavoidable impurity elements.
The thickness of the high-toughness mine disc saw blade steel plate is less than or equal to 12mm, and the maximum width of the high-toughness mine disc saw blade steel plate can reach 4000mm.
The reasons for limiting the steel composition in the present invention are set forth below:
carbon as a solid solution element can remarkably improve the strength and hardness of the steel plate, but the toughness and welding performance of the steel plate are adversely affected. Based on the hardness requirement of the steel plate, the carbon content is controlled to be 0.47-0.52%.
Si, silicon enters ferrite to play a solid solution strengthening role, so that the elastic limit and yield strength of steel can be obviously improved, the fatigue strength is improved, and the wear resistance and the service life of saw blade steel are improved. Meanwhile, si element has the effect of reducing volume change when austenite is transformed into martensite, so that the generation of quenching cracks is effectively controlled. But when the content is higher, the toughness of the steel can be reduced. The Si content of the invention is controlled to be 0.40-0.60%.
Mn, reducing the critical transformation temperature Ar3, improving the hardenability of steel, playing a solid solution strengthening role in the steel, and obviously improving the strength of the steel. The Mn content is too high, segregation is easy to generate, and the toughness of the steel plate is reduced. The invention provides that the manganese content is in the range of 1.30-1.50%.
V is refined grain element, V (C/N) is precipitated during tempering, and obvious precipitation strengthening effect and heat resistance can be achieved. The V content is too low, and the saw blade steel can be softened at high temperature to cause failure, and the V content is too high, so that the toughness and the welding performance of the steel plate can be deteriorated. Therefore, the V content of the invention is controlled to be 0.08-0.12%.
Al, deoxidizing and refining the grain elements. The invention cancels the addition of Nb and Ti and mainly refines grains by using Al at the temperature of more than 900 ℃. The content is too low, the refining effect is not obvious, the content is too high, al 2O3 inclusion is easy to form, and the toughness is not good. The present invention provides Al content of 0.03-0.06%.
Cr is an element for improving the hardenability of steel, promotes the transformation of martensite and improves the strength of steel. However, too high Cr content will affect the toughness of the steel and reduce the weldability of the steel sheet. The chromium content of the invention is controlled to be 0.10-0.30%.
Ca is inclusion modifying element, can react with strip MnS to generate spherical CaS, changes the anisotropy of the steel plate, can also enable Al 2O3 inclusion generated by Al deoxidation to be modified into spherical low-melting-point inclusion, promotes the floating removal of the inclusion, and improves the toughness of the steel plate. The Ca content is controlled to be 0.0010-0.0030%.
P is a harmful element in steel, is easy to segregate and has adverse effect on the plasticity and toughness of the material. The P content is high, the brittleness of the steel plate is increased, and the cold bending cracking of the steel plate is easy to be caused. The invention provides that P is less than or equal to 0.012 percent
S, harmful elements in the steel are easy to segregate, mnS segregation inclusions are easy to form with Mn elements, the steel plate is layered and cracked, and the cold bending performance of the steel plate is obviously reduced. Because the invention adopts a high Mn design, the S content must be controlled at a lower level, and S is specified to be less than or equal to 0.002 percent.
O, N, H harmful gas elements, high content, more inclusions, reduced plasticity and toughness of the steel plate and high cracking risk of the steel plate. The invention strictly controls the content of O to be not higher than 0.002%, the content of N to be not higher than 0.004% and the content of H to be not higher than 0.0002%.
The invention also provides a preparation method of the high-toughness mine disc saw blade steel plate, which comprises the following specific processes,
Smelting and continuous casting, namely, molten iron pretreatment is carried out, smelting is carried out in an electric furnace or converter mode, then the molten iron is sent into an LF refining furnace for refining, and VD or RH vacuum treatment is carried out. The molten steel is degassed and then subjected to a trace Ca treatment. The continuous casting adopts low superheat degree casting, whole argon protection casting and dynamic soft reduction control. The superheat degree of molten steel is controlled to be 5-20 ℃, the center segregation is not higher than C1.0 level, and the center porosity is not higher than 1.0 level.
The heating process is that the casting blank has high C content, is easy to crack, has a fast lower limit, and is directly sent to a step heating furnace without slow cooling. The temperature of the casting blank hot feeding furnace is not lower than 400 ℃, and the heating rate is less than or equal to 8.5min/cm. In order to avoid decarburization on the surface of a casting blank in the heating process, the casting blank adopts a low-temperature soaking process, the soaking temperature is 1150-1180 ℃, and the soaking time is 25-50 min.
The steel rolling process includes the steps of taking casting blank out of the furnace, descaling with high pressure water, and rolling in a steckel mill or a wide-thick plate mill with maximum width up to 4000mm. The steel plate adopts a high-temperature hot rolling mode, the initial rolling temperature is 1000-1100 ℃, and the final rolling temperature is more than or equal to 900 ℃. After the steel plate is rolled, the steel plate is rapidly taken off line for stacking and slow cooling, the slow cooling time is more than or equal to 48 hours, and the generation of cooling stress is avoided.
And the quenching process is to perform off-line quenching treatment after the steel plate is slowly cooled. In order to increase the toughness of saw blade steel and avoid quenching cracks, the steel plate is quenched in an Ac 1-Ac 3 two-phase region, the quenching temperature is 720-780 ℃, and the heat preservation time is 30-60 min after the core of the steel plate is at the temperature.
And tempering, namely tempering the steel plate at 400-500 ℃ after quenching. And after the core of the steel plate is heated, tempering and heat preserving for 30-90 min.
Compared with the prior art, the invention has the advantages that:
the invention adopts an economic component design, only contains low-cost metal elements of C, si, mn, cr, V and Ca, and has low cost.
The invention adopts the hot feeding and hot charging process to roll, the temperature of the casting blank is not lower than 400 ℃ when the casting blank is hot fed into the furnace, and the heating rate is not higher than 8.5min/cm, so that the problem of cracking of the middle and high carbon saw blade steel casting blank is solved, the heat of the casting blank is utilized, the heating energy consumption is reduced, the production rhythm is accelerated, the mass production is facilitated, and the cost is further reduced.
The steel plate is rolled by adopting a steckel mill or a wide-thick plate rolling mill, and compared with the traditional hot continuous rolling production process of saw blade steel, the diameter of the produced saw blade is larger and can reach 4000mm. Meanwhile, the steel plate is rolled without curling, so that the subsequent flattening working procedures of customers are reduced, the flatness is high, and the cost is low.
The invention eliminates laminar cooling, adopts high-temperature hot rolling and slow cooling after rolling, reduces the internal stress of the steel plate, and avoids the generation of quenching cracks.
Unlike traditional saw blade steel oil quenching heat treatment, the invention adopts water quenching directly, has low cost and is beneficial to environmental protection. Quenching the steel plate in a two-phase region to obtain a martensite and ferrite two-phase structure. The martensitic matrix provides high hardness and strength, and the ferritic matrix greatly improves the toughness of the saw blade steel, so that the risk of brittle fracture is reduced during subsequent use.
The steel plate has excellent toughness, 20 ℃ impact Akv is more than or equal to 27J, and the hardness is 30-40 HRC. The saw blade can stably run within the temperature range of 400-500 ℃ and has longer service life.
The method can be popularized and applied to the production of other high-carbon or low-carbon steel for saw blades.
Drawings
FIG. 1 is a metallographic photograph of a typical quenched structure of a test steel according to example 1 of the present invention.
Detailed Description
The present invention is further illustrated by the following examples.
The production process flow of the high-strength steel comprises converter or electric furnace steelmaking- > LF refining- > VD or RH vacuum degassing- > Ca treatment- > continuous casting- > hot delivery- > heating- > rolling- > slow cooling- > quenching- > tempering of a steel plate.
The production method of the high-toughness mine disc saw blade steel plate in the embodiment 1-2 comprises the following steps:
(1) Smelting in 150 ton converter, refining in LF furnace, RH vacuum degassing, and Ca treating. Molten steel is cast into a continuous casting blank with the thickness of 150 mm. The casting temperature is controlled to be 5-20 ℃ above the liquidus line. Dynamic soft pressing is performed during casting. Center segregation is not higher than C1.0 level, and center porosity is not higher than 1.0 level. The final composition control of the molten steel is shown in Table 1.
(2) And (3) heating and rolling, namely, conveying the continuous casting blank obtained in the step (1) to a step heating furnace. The temperature of the casting blank hot feeding furnace is not lower than 400 ℃, and the heating rate is less than or equal to 8.5min/cm. The casting blank adopts a low-temperature soaking process, the soaking temperature is 1150-1180 ℃, and the soaking time is 25-50 min. The casting blank is treated by high-pressure water descaling after being discharged from the furnace and (5) entering a steckel mill or a wide and thick plate mill for rolling. The steel plate adopts a high-temperature hot rolling mode, the initial rolling temperature is 1000-1100 ℃, and the final rolling temperature is more than or equal to 900 ℃.
(3) And (3) after the steel plate is rolled, rapidly taking off for stacking and slow cooling, wherein the slow cooling time is more than or equal to 48 hours, and the generation of cooling stress is avoided.
(4) Quenching, namely carrying out off-line quenching treatment on the steel plate after slow cooling. In order to increase the toughness of saw blade steel and avoid quenching cracks, the steel plate is quenched in an Ac 1-Ac 3 two-phase region, the quenching temperature is 720-780 ℃, and the heat preservation time is 30-60 min after the core of the steel plate is at the temperature.
(5) Tempering, namely tempering the steel plate at 400-500 ℃ after quenching. And after the core of the steel plate is heated, tempering and heat preserving for 30-90 min.
The specific components and the technological parameters are shown in tables 1-3. The corresponding properties of each example template are shown in Table 4.
TABLE 1 chemical composition (wt%) of ultra-strong steel sheet of example
| Examples | C | Si | Mn | P | S | Al | V | Cr | Ca | O | N | H |
| 1 | 0.51 | 0.50 | 1.45 | 0.010 | 0.001 | 0.040 | 0.11 | 0.25 | 0.0015 | 0.0010 | 0.0030 | 0.0001 |
| 2 | 0.49 | 0.55 | 1.40 | 0.010 | 0.001 | 0.045 | 0.09 | 0.15 | 0.0012 | 0.0008 | 0.0028 | 0.0001 |
Table 2 rolling process control
TABLE 3 Heat treatment Process control
TABLE 4 tensile, impact and flexural Properties of examples of the invention
FIG. 1 shows a metallographic photograph of a typical quenched structure of the test steel of example 1. The quenched structure of the steel sheet is a dual-phase structure composed of martensite and ferrite, ensuring excellent impact toughness of the steel sheet.
The invention adopts a high-cleanliness steelmaking continuous casting process and hot-feeding hot rolling and tempering heat treatment processes, controls from the angles of chemical composition design, base metal structure, rolling deformation, heat treatment temperature, time and the like, ensures that the steel plate has high wear resistance, high toughness and excellent heat resistance, and provides a solution for improving the impact toughness of the steel for the medium-high carbon saw blade.
While the preferred embodiments of the present invention have been described in detail, it is to be clearly understood that the same may be varied in many ways by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A high-toughness mine disc saw blade steel plate is characterized by comprising the following components in percentage by weight, wherein the balance of ：C：0.47～0.52%,Si：0.40～0.60%,Mn：1.30～1.50%,V：0.08～0.12%,Al：0.03～0.06%,Cr：0.10～0.30%,P：≤0.012%,S：≤0.002%,Ca：0.0010～0.0030%,O：≤0.002%,N：≤0.004%,H：≤0.0002%, is Fe and unavoidable impurity elements;
the impact Akv of the steel plate at 20 ℃ is more than or equal to 27J, the hardness is 30-40 HRC, and the manufactured saw blade can stably run within the range of 400-500 ℃;
the quenched structure of the steel sheet is a two-phase structure composed of a fine martensitic structure and a ferritic structure.
2. The high-toughness mine disc saw blade steel plate according to claim 1, wherein the thickness of the steel plate is less than or equal to 12mm and the width is 4000mm.
3. A method for manufacturing a high-toughness mine disc saw blade steel plate according to claim 1 is characterized in that the whole process flow comprises the following steps:
(1) Smelting continuous casting
Smelting in a converter mode according to the formulated chemical components, and further fine-tuning by adopting external refining and vacuum treatment;
(2) Heating and rolling
Directly heating the cast blank after continuous casting to a heating furnace, wherein the temperature of the cast blank is not lower than 400 ℃, the heating rate is not more than 8.5min/cm, and the cast blank is subjected to high-pressure water descaling treatment after being discharged from the furnace and then enters a steckel mill or a wide-thick plate mill for rolling;
(3) Slowly cooling
After the steel plate is rolled, rapidly taking off the coil to stack and slowly cool, wherein the slow cooling time is more than or equal to 48 hours;
(4) Quenching, namely quenching the slowly cooled steel plate in an Ac 1-Ac 3 two-phase region, wherein the quenching temperature is 720-780 ℃, and the heat preservation time is 30-60 min after the core of the steel plate reaches the temperature;
(5) Tempering, namely tempering the steel plate at 400-500 ℃ after quenching, and after the core part of the steel plate reaches the temperature, tempering and preserving the temperature for 30-90 min.
4. The method for manufacturing the high-toughness mine disc saw blade steel plate is characterized in that the smelting continuous casting process is specifically characterized in that molten iron pretreatment is carried out, smelting is carried out in an electric furnace or converter mode, then the molten iron is sent into an LF refining furnace for refining, and after degassing, micro Ca treatment is carried out on molten steel, continuous casting is carried out by adopting low superheat degree pouring, whole argon protection pouring and dynamic soft reduction control, the superheat degree of the molten steel is controlled to be 5-20 ℃, center segregation is not higher than C1.0 level, and center porosity is not higher than 1.0 level.
5. The method for manufacturing the high-toughness mine disc saw blade steel plate according to claim 3, wherein in the step (2), in order to avoid decarburization on the surface of a casting blank in the heating process, the casting blank adopts a low-temperature soaking process, the soaking temperature of the casting blank is 1150-1180 ℃, and the soaking time is 25-50 min.
6. The method for manufacturing the high-toughness mine disc saw blade steel plate according to claim 3, wherein the steel plate in the step (2) is subjected to high-temperature hot rolling, the initial rolling temperature is 1000-1100 ℃, and the final rolling temperature is more than or equal to 900 ℃.
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| CN103173685A (en) * | 2013-01-07 | 2013-06-26 | 宝钢集团新疆八一钢铁有限公司 | Production method of high-strength saw bit steel coil |
| CN104532150A (en) * | 2014-12-19 | 2015-04-22 | 宝山钢铁股份有限公司 | Economical and ultra-wide saw steel and preparation method thereof |
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| CN104532150A (en) * | 2014-12-19 | 2015-04-22 | 宝山钢铁股份有限公司 | Economical and ultra-wide saw steel and preparation method thereof |
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