CN116121644A - High-toughness mine disc saw blade steel plate and manufacturing method thereof - Google Patents

High-toughness mine disc saw blade steel plate and manufacturing method thereof Download PDF

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CN116121644A
CN116121644A CN202211663161.XA CN202211663161A CN116121644A CN 116121644 A CN116121644 A CN 116121644A CN 202211663161 A CN202211663161 A CN 202211663161A CN 116121644 A CN116121644 A CN 116121644A
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steel plate
percent
saw blade
toughness
equal
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刘俊
武金明
杨洋
韩步强
王小双
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Jiangyin Xingcheng Special Steel Works Co Ltd
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Jiangyin Xingcheng Special Steel Works Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • 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
    • 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")
    • C—CHEMISTRY; METALLURGY
    • 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
    • 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
    • C21D1/60—Aqueous agents
    • C—CHEMISTRY; METALLURGY
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • C—CHEMISTRY; METALLURGY
    • 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
    • C—CHEMISTRY; METALLURGY
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Abstract

The invention relates to a high-toughness mine disc saw blade steel plate and a production method thereof, wherein the steel plate comprises the following chemical components in percentage by weight: c:0.47 to 0.52 percent, si:0.40 to 0.60 percent, mn:1.30 to 1.50 percent, V:0.08 to 0.12 percent, al:0.03 to 0.06 percent, cr:0.10 to 0.30 percent, P: less than or equal to 0.012 percent, S: less than or equal to 0.002 percent, ca:0.0010 to 0.0030 percent, O: less than or equal to 0.002 percent, N: less than or equal to 0.004 percent, H: less than or equal to 0.0002 percent, and the balance being Fe and unavoidable impurity elements. The production process comprises the following steps: 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 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 at 400-500 ℃ and has longer service life.

Description

High-toughness mine disc saw blade steel plate and manufacturing method thereof
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 a method for producing the same. The carbon content of the invention is 0.72-0.80%, needle martensite is easy to generate after quenching, and the invention has high strength, good wear resistance but 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 method for producing the same. 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 of manufacturing the same. The invention adopts 0.35-0.45% medium carbon design, combines Nb/V/Ti microalloying, and simultaneously adds noble metals such as Mo, ni and the like to increase the toughness of the steel plate. 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 the hardness of the saw blade is rapidly reduced when the saw blade works at the temperature of more than 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 invention solves the problems by adopting the following technical scheme: a high-toughness mine circular saw blade steel plate comprises the following chemical components in percentage by mass: 0.47 to 0.52 percent, si:0.40 to 0.60 percent, mn:1.30 to 1.50 percent, V:0.08 to 0.12 percent, al:0.03 to 0.06 percent, cr:0.10 to 0.30 percent, P: less than or equal to 0.012 percent, S: less than or equal to 0.002 percent, ca:0.0010 to 0.0030 percent, O: less than or equal to 0.002 percent, N: less than or equal to 0.004 percent, H: less than or equal to 0.0002 percent, and the balance being 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:
c: 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. The carbon content in the invention is controlled to be 0.47-0.52% based on the hardness requirement of the steel plate.
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: the critical transformation temperature Ar3 is reduced, the hardenability of the steel is improved, the solid solution strengthening effect is achieved in the steel, and the strength of the steel is obviously improved. 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 added in the range of 1.30-1.50%.
V: the grain elements are refined, 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; the V content is too high, which deteriorates toughness and weldability of the steel sheet. 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 ℃. Too low content, insignificant refining effect, too high content, and easy formation of Al 2 O 3 Inclusion has adverse effect on toughness. The Al content is 0.03-0.06%.
Cr: is an element for improving the hardenability of steel, promotes the transformation of martensite, and improves the strength of the 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 between 0.10 and 0.30 percent.
Ca: the inclusion modifying element can react with strip MnS to generate spherical CaS, change the anisotropy of the steel plate and enable Al generated by Al deoxidization to be changed 2 O 3 The inclusion is denatured into spherical low-melting-point inclusions, so that the floating removal of the inclusions is promoted, and the toughness of the steel plate is improved. The invention controls the Ca content to be 0.0010 to 0.0030 percent.
P: harmful elements in the steel are easy to segregate, and have adverse effects 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 cause. The invention provides that P: 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. Since the present invention adopts a high Mn design, the S content must be controlled at a low level, specifying S: 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 content of O is strictly controlled to be not higher than 0.002%; the N content is not higher than 0.004%; the H content is 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 processes: molten iron pretreatment is carried out, smelting is carried out by adopting an electric furnace or converter mode, then the molten iron is sent into an LF refining furnace for refining, and vacuum treatment is carried out by VD or RH. 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 at 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 comprises the following steps: because the casting blank C content is high, cracks are easy to generate, the casting blank is fast at the lower limit and is directly sent to the 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 the 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 comprises the following steps: and after the casting blank is discharged from the furnace, the casting blank is subjected to high-pressure water descaling treatment and then enters a steckel mill or a wide-thick plate mill for rolling, and the maximum width can reach 4000mm. The steel plate adopts a high-temperature hot rolling mode, the initial rolling temperature is between 1000 and 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.
The quenching process comprises the following steps: and (5) after the steel plate is slowly cooled, performing off-line quenching treatment. In order to increase the toughness of saw blade steel and avoid quenching cracks, the quenching of the steel plate is performed 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 reaches the temperature.
Tempering: after quenching, the steel sheet needs to be tempered at 400-500 ℃. And after the core of the steel plate reaches the temperature, tempering and heat preserving time is 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 hot feeding furnace is used, the heating rate is not higher than 8.5min/cm, 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 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 at 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.
Description of the 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 the following steps: 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 the 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) Steelmaking continuous casting: smelting by adopting a 150 ton converter, then sending into an LF furnace for refining, carrying out RH vacuum degassing treatment, and carrying out Ca treatment by breaking the air. 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: and (3) hot-feeding 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. And (3) after the casting blank is discharged from the furnace, the casting blank enters a steckel mill or a wide and thick plate mill for rolling after being subjected to high-pressure water descaling treatment. The steel plate adopts a high-temperature hot rolling mode, the initial rolling temperature is between 1000 and 1100 ℃, and the final rolling temperature is more than or equal to 900 ℃.
(3) Slowly cooling: 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.
(4) Quenching: and (5) after the steel plate is slowly cooled, performing off-line quenching treatment. In order to increase the toughness of saw blade steel and avoid quenching cracks, the quenching of the steel plate is performed 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 reaches the temperature.
(5) Tempering: after quenching, the steel sheet needs to be tempered at 400-500 ℃. And after the core of the steel plate reaches the temperature, tempering and heat preserving time is 30-90 min.
The specific components and the technological parameters are shown in tables 1 to 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
Figure BDA0004014777500000051
TABLE 3 Heat treatment Process control
Figure BDA0004014777500000052
TABLE 4 tensile, impact and flexural Properties of examples of the invention
Figure BDA0004014777500000053
Figure BDA0004014777500000061
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 (8)

1. A high-toughness mine disc saw blade steel plate is characterized in that: the steel plate comprises the following components in percentage by weight: c:0.47 to 0.52 percent, si:0.40 to 0.60 percent, mn:1.30 to 1.50 percent, V:0.08 to 0.12 percent, al:0.03 to 0.06 percent, cr:0.10 to 0.30 percent, P: less than or equal to 0.012 percent, S: less than or equal to 0.002 percent, ca:0.0010 to 0.0030 percent, O: less than or equal to 0.002 percent, N: less than or equal to 0.004 percent, H: less than or equal to 0.0002 percent, and the balance being Fe and unavoidable impurity elements.
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 of the steel plate can reach 4000mm.
3. The high-toughness mine disc saw blade steel plate according to claim 1, wherein the steel plate has 20 ℃ impact Akv not less than 27J and hardness of 30-40 HRC, and the manufactured saw blade can stably operate within the range of 400-500 ℃.
4. The high-toughness mine disc saw blade steel plate according to claim 1, wherein the quenched structure of the steel plate is a dual-phase structure consisting of a fine martensitic structure and a ferrite structure.
5. A method of manufacturing a high toughness mine disc saw blade steel plate according to claim 1, wherein: the whole process flow is as follows: smelting, continuous casting, heating, rolling, slow cooling, quenching and tempering, and the specific steps are as follows:
(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: 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: tempering is carried out at 400-500 ℃ after the steel plate is quenched, and the tempering and heat preserving time is 30-90 min after the core of the steel plate reaches the temperature.
6. The method for manufacturing the high-toughness mine disc saw blade steel plate according to claim 5, wherein the method comprises the following steps: the smelting continuous casting process specifically comprises the following steps: molten iron pretreatment is carried out, smelting is carried out by adopting an electric furnace or a converter mode, then the molten iron is sent into an LF refining furnace for refining, and is subjected to VD or RH vacuum treatment, micro Ca treatment is carried out after molten steel is degassed, low superheat degree pouring is adopted in continuous casting, whole-course argon protection pouring is adopted, dynamic soft reduction control is carried out, 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.
7. The method for manufacturing the high-toughness mine disc saw blade steel plate according to claim 5, wherein the method comprises the following steps: in the step (2), in order to avoid decarburization on the surface of the 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.
8. The method for manufacturing the high-toughness mine disc saw blade steel plate according to claim 5, wherein the method comprises the following steps: the steel plate in the step (2) adopts a high-temperature hot rolling mode, the initial rolling temperature is between 1000 and 1100 ℃, and the final rolling temperature is more than or equal to 900 ℃.
CN202211663161.XA 2022-12-23 2022-12-23 High-toughness mine disc saw blade steel plate and manufacturing method thereof Pending CN116121644A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116536592A (en) * 2023-07-04 2023-08-04 长沙中达智能科技有限公司 Steel for circular saw blade matrix and production method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116536592A (en) * 2023-07-04 2023-08-04 长沙中达智能科技有限公司 Steel for circular saw blade matrix and production method thereof
CN116536592B (en) * 2023-07-04 2023-09-01 长沙中达智能科技有限公司 Steel for circular saw blade matrix and production method thereof

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