CN111471928A - Wear-resistant steel plate with basket braided martensite metallographic structure and production method thereof - Google Patents
Wear-resistant steel plate with basket braided martensite metallographic structure and production method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 147
- 239000010959 steel Substances 0.000 title claims abstract description 147
- 229910000734 martensite Inorganic materials 0.000 title claims abstract description 56
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 29
- 238000005496 tempering Methods 0.000 claims abstract description 31
- 238000010791 quenching Methods 0.000 claims abstract description 27
- 230000000171 quenching effect Effects 0.000 claims abstract description 27
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 16
- 238000005516 engineering process Methods 0.000 claims abstract description 15
- 238000005096 rolling process Methods 0.000 claims abstract description 13
- 238000009628 steelmaking Methods 0.000 claims abstract description 13
- 239000013078 crystal Substances 0.000 claims abstract description 9
- 230000006911 nucleation Effects 0.000 claims abstract description 9
- 238000010899 nucleation Methods 0.000 claims abstract description 9
- 239000000126 substance Substances 0.000 claims abstract description 8
- 239000012535 impurity Substances 0.000 claims abstract description 7
- 238000010008 shearing Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 12
- 238000005272 metallurgy Methods 0.000 claims description 9
- 238000009941 weaving Methods 0.000 claims 1
- 238000003466 welding Methods 0.000 abstract description 9
- 229910045601 alloy Inorganic materials 0.000 abstract description 8
- 239000000956 alloy Substances 0.000 abstract description 8
- 238000003723 Smelting Methods 0.000 abstract description 6
- 238000005452 bending Methods 0.000 abstract description 3
- 229910000599 Cr alloy Inorganic materials 0.000 abstract 1
- 229910001182 Mo alloy Inorganic materials 0.000 abstract 1
- 229910001257 Nb alloy Inorganic materials 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 10
- 239000000463 material Substances 0.000 description 8
- 229910052799 carbon Inorganic materials 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 238000011056 performance test Methods 0.000 description 5
- 238000005299 abrasion Methods 0.000 description 4
- 238000005336 cracking Methods 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- 230000000717 retained effect Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 244000137852 Petrea volubilis Species 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 238000009954 braiding Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007542 hardness measurement Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 238000010183 spectrum analysis Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
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- 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
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- 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
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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
- C22C38/002—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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- 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
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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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- 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
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Abstract
The invention discloses a wear-resistant steel plate with a basket-knitted martensite metallographic structure and a production method thereof, belonging to the technical field of steel smelting, wherein the wear-resistant steel plate comprises the following chemical components in percentage by mass: c = 0.15-0.25, Si = 0.8-2.0, Mn = 1.0-2.0, P is less than or equal to 0.020, S is less than or equal to 0.005, Ti = 0.070-0.20, B = 0.0010-0.0025, and the balance is Fe and inevitable impurities; the metallographic structure of the wear-resistant steel plate is a basket-woven martensite structure formed by shearing and growing of an original austenite crystal inner nucleation; the production method comprises the following steps: producing a plate blank by steelmaking; rolling a steel plate; off-line quenching; and (6) tempering. The invention reduces the alloy content without adopting Cr, Mo and Nb alloy elements; adopting Ti oxide smelting technology; the tempering temperature is increased; the wear-resistant steel plates of all levels are flexibly produced, and the cold-bending forming performance and the welding performance of the wear-resistant steel plates are effectively improved.
Description
Technical Field
The invention relates to the technical field of steel smelting, in particular to a wear-resistant steel plate with a basket braided martensite metallographic structure and a production method thereof.
Background
The high-strength wear-resistant steel plate is used as an important steel material and is widely applied to industries such as mining machinery, vehicles, ships, bridges and the like. With the rapid development of national economy, the demand for high-strength wear-resisting plates is rapidly increased. At present, domestic wear-resistant steel has poor cold-bending forming performance and welding performance. China also needs a considerable amount of wear-resistant steel plates to be imported, in particular to high-strength wear-resistant plates above 400 HB.
At present, the wear-resistant steel has two different production process routes: off-line quenching and tempering, and on-line quenching and tempering.
The structure of the wear-resistant steel plate produced by the off-line quenching and tempering process is as follows: the tempered lath martensite and a small amount of retained Austenite (AR) are mainly used for strengthening the martensite by virtue of a large amount of alloy elements, so that the hardenability and the tempering resistance of the martensite are improved, the hardenability of the steel plate is improved, the requirements of the steel plate on high strength and high hardness are met, and the requirement of the steel plate on wear resistance is met; however, after the tempered martensite steel is welded, the hardness of the heat affected zone is reduced, cold cracks are generated in the heat affected zone at the same time, and the cracks generated after the steel plate is cut by flame can be expanded if the treatment is not performed in time.
The structure of the wear-resistant steel plate produced by the on-line quenching and tempering process is as follows: lath martensite + retained Austenite (AR). The current production process route of typical wear-resistant steel plates is shown in table 1:
table 1 typical wear-resistant steel plate production process route chart
The technical conditions for delivering the wear-resistant steel plates in various factories are different, and the analysis on the microscopic structures of the wear-resistant steel plates in various factories is different at present.
The WNM-400 steel wear plate has an OM shape of on-line quenching and tempering, and the combination of X-ray diffraction and TEM analysis shows that the structure consists of lath martensite and retained austenite. As shown in fig. 1 and 2.
The ANM-360 and ANM-400 wear-resistant steel consists of lath martensite and fine residual austenite films among laths; the spherical second-phase particles are distributed relatively uniformly, the size is 10-30 nm, and energy spectrum analysis shows that the second-phase particles are Nb and Ti composite carbonitride mainly containing Nb; the residual austenite amount measured by the X-ray diffractometer is 7%. As shown in fig. 3.
The structure of the wear-resisting plate made of the JNM-400 steel is typical tempered low-carbon lath martensite, and the structure of the lath of the martensite is relatively coarse. As shown in fig. 4.
The structure of the SNM-400 steel wear plate (shown in figures 5 and 7) is typical of low-carbon tempered lath martensite like the structure of the JNM-400 steel wear plate (shown in figure 6), except for part of large laths, the grains are finer, the laths are finer than the JNM-400, and the impact toughness is higher.
The mechanical properties of WNM-400, JNM-400 and SNM-400 wear-resistant steel plates are shown in Table 2:
TABLE 2 WNM-400, JNM-400 and SNM-400 mechanical properties
WNM-400, JNM-400 and SNM-400 wear-resistant steel plates have different hardness, and are shown in Table 3:
TABLE 3 hardness properties of WNM-400 and JNM-400, SNM-400
| Steel grade | Hardness measurement value HB | Average value HB |
| WNM-400 | 388 389 390 393 391 401 401 398 390 398 | 394 |
| JNM-400 | 373 390 375 390 375 378 390 393 385 390 | 384 |
| SNM-400 | 375 392 368 372 381 380 390 390 392 372 | 381 |
WNM-400 is different from JNM-400 and SNM-400 in wear resistance, and is shown in Table 4. the two-body abrasive wear test is carried out on an M L10 type abrasive wear testing machine, the size of a wear sample is 4 × 24mm, the test parameters are a grinding distance 10.409M, the size of the wear sample is 180# silicon carbide water sand paper, the load is 19.3N, the motion state of the sample is horizontally fed by 4mm/rad, the mass of the wear sample before and after wear is measured by a TG328 type balance at a rotating speed of 60r/min, and the mass loss after wear is calculated.
TABLE 4 WNM-400, JNM-400 and SNM-400 for wear resistance
As can be seen from Table 4, WNM-400 steel plate produced by off-line quenching had the best wear resistance.
As can be seen from FIG. 8, the lath structure formed by different heat treatment processes is shear-grown from austenite grain boundary nucleation to grain interior, so that the crack propagates along the lath direction when the material is broken, and the toughness of the material is lower.
As can be seen from fig. 9, the dislocation density in on-line quenching is large, the plasticity of the material is low, and the internal stress is large.
The defects of the prior art are as follows: the lath martensite structure of the wear-resistant steel generates shear growth in grain boundary nucleation to form a bundle of cutting prior austenite grains, when the material is fractured, cracks rapidly expand between the laths along the bundle direction of the structure, and the plasticity and the toughness of the material are low; the martensite structure of the tempered lath enables the steel plate to crack after flame cutting, and the steel plate naturally cracks under the action of internal stress after long-time storage; the tempered lath has poor low-temperature toughness of a martensite structure; a large amount of alloy elements are added for improving the wear resistance of a martensite structure of a tempered lath, so that the production cost is high, the alloy content is high, and surface cracks are easy to generate on a continuous casting billet.
Chinese patent application No. 201110358240.5, "a method for producing wear-resistant steel plate", the heat treatment adopts Q-P (quenching-carbon distribution) process, and the steel plate structure is (lath M + AR), as shown in fig. 10.
Chinese patent application No. 201010260178.1 'A low-cost high-strength wear-resistant steel plate and a production method thereof', the process is Q + T, and the component system is C-Si-Mn-Cr-Ti. The production process of the steel plate comprises quenching and tempering, the structure of the steel plate is a coarse lath tempered martensite structure, and the residual austenite of the traditional tempered wear-resistant steel after quenching is less than or equal to 3 percent.
The wear-resistant steel plate in the extremely cold region is required to have better low-temperature impact toughness, the structure of the existing general wear-resistant steel plate cannot meet the use requirement, and the wear-resistant steel plate needs to be improved to meet the use requirement. The structure of the wear-resistant steel plate (lath M + AR) can not meet the requirement of high-heat input welding of the steel plate, and the tempering resistance of a heat affected zone is poor.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a wear-resistant steel plate with a basket-knitted martensite metallographic structure and a production method, wherein the metallographic structure of the wear-resistant steel plate is the basket-knitted martensite structure with long original austenite crystal internal nucleation length; the basket braided martensite nucleates in original austenite crystal and generates shear growth towards the periphery, so that the basket braided martensite structure has better capability of preventing crack propagation, the appearance of a low-temperature impact fracture at minus 40 ℃ still has a large amount of tough pits, and the material with the structure has high low-temperature impact toughness and meets the use requirement in extremely cold regions; the oxide smelting technology of Ti is adopted in steel making, so that the martensite woven by the crystal inner nucleation basket can meet the requirement of high heat input welding, and the welding efficiency is improved; the basket-knitted martensite structure has high tempering resistance, and by utilizing the characteristics, wear-resistant steel plates (NM400, NM450 and NM500) of various grades can be flexibly produced; the temperature of the tempering process of the basket braiding martensite structure is increased, so that the cracking of flame cutting of the steel plate and the natural cracking tendency of the steel plate are reduced.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the wear-resistant steel plate with the basket braided martensite metallographic structure comprises the following chemical components in percentage by mass: 0.15-0.25% of C, 0.8-2.0% of Si, 1.0-2.0% of Mn, less than or equal to 0.020% of P, less than or equal to 0.005% of S, 0.070-0.20% of Ti, 0.0010-0.0025% of B, and the balance of Fe and inevitable impurities; the metallographic structure of the wear-resistant steel plate is a basket-woven martensite structure formed by shearing and growing of an original austenite crystal inner nucleation.
A method of producing a wear resistant steel sheet having a basket-knitted martensitic metallographic structure comprising the steps of:
(1) steel-making and slab production: producing a high-quality plate blank by adopting Ti oxide metallurgy technology;
(2) rolling a steel plate: adopting a controlled rolling technology to produce a steel plate with corresponding thickness;
(3) off-line quenching: quenching and heating at 890-910 ℃ for no less than 30min, and cooling;
(4) tempering, heating at 200-400 deg.C for 4-5 min/mm × plate thickness, and air cooling.
The technical proposal of the invention is further improved in that the furnace time in the step (3) is 1.8min/mm × plate thickness.
Due to the adoption of the technical scheme, the invention has the technical progress that:
1. the martensite of the invention nucleates in the prior austenite crystal and generates shear growth towards the periphery to form a basket-knitted martensite metallographic structure; as shown in fig. 11 and 12.
2. The basket braided martensite metallographic structure has better capability of preventing crack propagation, a large number of tough pits exist in the appearance of a low-temperature impact fracture at minus 40 ℃, and a material with the structure has high low-temperature impact toughness and meets the use requirement in extremely cold regions; the wear-resistant steel with the martensite metallographic structure braided by the basket has better wear resistance than that of the wear-resistant steel with the lath structure; the oxide smelting technology of Ti is adopted in steel making, so that the martensite woven by the inner basket of the crystal can meet the requirement of high heat input welding, and the welding efficiency is improved.
3. According to the invention, the basket-knitted martensite metallographic structure steel plate has high tempering resistance, and various grades of wear-resistant steel plates (NM400, NM450 and NM500) can be flexibly produced by utilizing the characteristics; the tempering process temperature is increased, so that the cracking tendency of flame cutting of the steel plate and the natural cracking tendency of the steel plate are reduced.
4. The basket-knitted martensite metallographic structure steel plate only needs low-component alloy content, does not adopt alloy elements such as Cr, Mo, Nb and the like, and has low production cost.
Drawings
FIG. 1 is a metallographic structure diagram of a WNM-400 steel plate subjected to hot rolling;
FIG. 2 is a metallographic structure diagram of a WNM-400 steel plate;
FIG. 3 is a metallographic structure diagram of an ANM-400 steel plate;
FIG. 4 is a metallographic structure diagram of a JNM-400 steel plate;
FIG. 5 is a metallographic structure diagram of a SNM-400 steel plate;
FIG. 6 is a metallographic structure diagram of a normal-temperature impact fracture of JNM-400G steel;
FIG. 7 is a metallographic structure diagram of SNM-400 steel-40 ℃ impact fractures;
FIG. 8 is a lath metallographic structure morphology of the experimental steel plate under different quenching states;
FIG. 9 is a dislocation metallographic structure morphology of an experimental steel plate in different quenching states;
FIG. 10 is a metallographic structure diagram of a Q-P treated wear-resistant steel plate;
FIG. 11 is a quenched metallographic structure of a steel plate;
FIG. 12 is a diagram showing the martensite nucleation position within prior austenite grains;
FIG. 13 is a diagram of the metallographic structure series temperature tempered metallographic structure and the morphology of a low-temperature impact fracture at-40 ℃ of the wear-resistant steel plate of the invention;
FIG. 14 is a graph of the morphology of a PYNM500 steel plate tempered metallographic structure and a-40 ℃ low-temperature impact fracture;
FIG. 15 is a graph of the morphology of a PYNM450 steel plate tempered structure and a low-temperature impact fracture at-40 ℃;
FIG. 16 is a graph of the PYNM400 steel plate tempered metallographic structure and the appearance of a low-temperature impact fracture at-40 ℃.
Detailed Description
The invention is described in further detail below with reference to the following figures and examples:
the wear-resistant steel plate with the basket braided martensite metallographic structure comprises the following chemical components in percentage by mass: 0.15-0.25% of C, 0.8-2.0% of Si, 1.0-2.0% of Mn, less than or equal to 0.020% of P, less than or equal to 0.005% of S, 0.070-0.20% of Ti, 0.0010-0.0025% of B, and the balance of Fe and inevitable impurities; the metallographic structure of the wear-resistant steel plate is a basket-woven martensite structure formed by shearing and growing of an original austenite crystal inner nucleation.
A method of producing a wear resistant steel sheet having a basket-knitted martensitic metallographic structure comprising the steps of:
(1) steel-making and slab production: producing a high-quality plate blank by adopting Ti oxide metallurgy technology;
(2) rolling a steel plate: adopting a controlled rolling technology to produce a steel plate with corresponding thickness;
(3) off-line quenching, namely, quenching at the heating temperature of 890-910 ℃ for 1.8min/mm × plate thickness in a furnace for not less than 30min, and cooling;
(4) tempering, heating at 200-400 deg.C for 4-5 min/mm × plate thickness, and air cooling.
The mechanical properties of the wear-resistant steel plate with the basket-braided martensite metallographic structure produced by the invention are shown in Table 5:
TABLE 5 mechanical performance of 20mm thick wear-resistant steel plate
From table 5, it can be seen that the tempering temperature has the following effect on the mechanical properties of the steel plate when producing the wear-resistant steel plate with the thickness of 20 mm:
when the tempering temperature is 200 ℃, the yield strength is more than or equal to 1145MPa, Rm is more than or equal to 1689MPa, the elongation is more than or equal to 20.5 percent, and the temperature is minus 40 ℃ AKV2Not less than 59J, and hardness not less than 515 HB.
When the tempering temperature is 300 ℃, the yield strength is more than or equal to 990MPa, Rm is more than or equal to 1391MPa, the elongation is more than or equal to 18 percent, and the temperature is minus 40 ℃ AKV2Not less than 46J and hardness not less than 448 HB.
When the tempering temperature is 400 ℃, the yield strength is more than or equal to 941MPa, Rm is more than or equal to 1317MPa, the elongation is more than or equal to 18 percent, and the temperature is minus 40 ℃ AKV2More than or equal to 48J, and the hardness is more than or equal to 403 HB.
From the data, the wear-resistant steel plate produced by the production method has stable performance and can meet the relevant use requirements.
The comparison result of the impact wear test of the PYNM400 wear-resistant steel plate produced by the invention and the WNM400 steel plate quenched off line is shown in Table 6:
TABLE 6 comparative results of impact abrasion test
As can be seen from table 6: the wear resistance of the PYNM400 wear-resistant steel plate produced by the invention is obviously higher than that of the WNM400 steel plate quenched off line.
As shown in FIG. 13, the metallographic structure of the wear-resistant steel plate produced by the method is obviously different from that of the wear-resistant steel plate produced by other methods as can be seen from FIG. 13.
The following are specific examples
Example 1
The PYNM500 wear-resistant steel plate with the basket braided martensite metallographic structure is produced by the following process:
the steel making uses Ti oxide metallurgy to produce high quality steel billet, the chemical composition mass percent of the steel is C0.20, Si 1.05, Mn 1.33, P0.015, S0.003, Ti 0.078, B0.0020, Ni 0.18, the rest is Fe and inevitable impurity.
The production process route is as follows: steel-making production plate blank → rolled steel plate → off-line quenching → tempering.
(1) And (3) producing a steel plate blank, namely producing a high-quality 320 × 2000mm section plate blank by adopting Ti oxide metallurgy technology.
(2) And (3) rolling the steel plate, namely producing the 30 × 2200 × 12000mm steel plate by adopting a controlled rolling technology, wherein the thickness of the steel plate is 30 mm.
(3) Off-line quenching, namely quenching at the heating temperature of 910 ℃ for 54min in a furnace for 1.8 × 30, and cooling.
(4) Tempering, heating at 200 deg.C for 5 × 30min, and air cooling.
The results of the performance test of the PYNM500 wear-resistant steel sheet having a basket braid martensite metallographic structure produced in this example are shown in table 7:
TABLE 7 PYNM500 abrasion-resistant steel plate performance test results
As can be seen from table 7: the thickness specification of the PYNM500 wear-resistant steel plate is 30mm, the yield strength is more than or equal to 1149MPa, the Rm is more than or equal to 1678MPa, the elongation is more than or equal to 20.5 percent, and the temperature is minus 40 ℃ AKV2The hardness is more than or equal to 61J and more than or equal to 507HB, and the steel plate produced by the production method has stable performance and can meet the use requirement as can be seen from the example.
The PYNM500 wear-resistant steel plate with the basket braided martensite metallographic structure produced in the embodiment has the metallographic structure after tempering and the appearance of a low-temperature impact fracture at the temperature of minus 40 ℃, as shown in FIG. 14.
Example 2
The PYNM450 wear-resistant steel plate with the basket braided martensite metallographic structure is produced by the following process:
the steel making uses Ti oxide metallurgy to produce high quality steel billet, the chemical composition mass percent of the steel is C0.20, Si 1.05, Mn 1.33, P0.015, S0.003, Ti 0.078, B0.0020, Ni 0.18, the rest is Fe and inevitable impurity.
The production process route is as follows: steel-making production plate blank → rolled steel plate → off-line quenching → tempering.
(1) And (3) producing a steel plate blank, namely producing a high-quality 320 × 2000 section plate blank by adopting Ti oxide metallurgy technology.
(2) And (3) rolling the steel plate, namely producing the 30 × 2200 × 12000mm steel plate by adopting a controlled rolling technology, wherein the thickness of the steel plate is 30 mm.
(3) Off-line quenching, namely quenching at the heating temperature of 900 ℃ for 54min in a furnace for 1.8 × 30, and cooling.
(4) Tempering, heating at 300 deg.C for 5 × 30min, and air cooling.
The results of the performance test of the PYNM450 wear-resistant steel sheet having a basket-braided martensitic microstructure produced in this example are shown in table 8:
TABLE 8 PYNM450 abrasion-resistant steel plate performance test results
As can be seen from table 8: the thickness specification of the PYNM450 wear-resistant steel plate is 30mm, the yield strength is not less than 991MPa, the Rm is not less than 1392MPa, the elongation is not less than 18.5 percent, and the temperature of minus 40 ℃ AKV2The hardness is more than or equal to 448HB, and the wear-resistant steel plate produced by the production method has stable performance and can meet the use requirement.
The PYNM450 steel plate with the basket-woven martensite metallographic structure produced in the example has the metallographic structure after tempering and the appearance of the low-temperature impact fracture at the temperature of minus 40 ℃, as shown in figure 15.
Example 3
The PYNM400 wear-resistant steel plate with the basket braided martensite metallographic structure is produced by the following process:
the steel making uses Ti oxide metallurgy to produce high quality steel billet, the chemical composition mass percent of the steel is C0.20, Si 1.05, Mn 1.33, P0.015, S0.003, Ti 0.078, B0.0020, Ni 0.18, the rest is Fe and inevitable impurity.
The production process route is as follows: steel-making production plate blank → rolled steel plate → off-line quenching → tempering.
(1) And (3) producing a steel plate blank, namely producing a high-quality 320 × 2000 section plate blank by adopting Ti oxide metallurgy technology.
(2) And (3) rolling the steel plate, namely producing the 30 × 2200 × 12000mm steel plate by adopting a controlled rolling technology, wherein the thickness of the steel plate is 30 mm.
(3) Off-line quenching, namely, quenching at the heating temperature of 890 ℃, cooling for 54min in a furnace with the time of 1.8 × 30.
(4) Tempering, heating at 400 deg.C for 5 × 30min, and air cooling.
The results of the performance test of the PYNM400 wear-resistant steel sheet having a basket-braided martensitic microstructure produced in this example are shown in table 9:
TABLE 9 PYNM400 abrasion resistant steel sheet property test results
As can be seen from table 9: the thickness specification of the PYNM400 wear-resistant steel plate is 30mm, the yield strength is more than or equal to 942MPa, the Rm is more than or equal to 1309MPa, the elongation is more than or equal to 19 percent, and the temperature of minus 40 ℃ AKV247J or more and 398HB or more in hardness, and as can be seen from the examples, the wear-resistant steel plate produced by the invention has stable performance and can meet the use requirements.
The PYNM400 wear-resistant steel plate with the basket braided martensite metallographic structure produced in the embodiment has the metallographic structure after tempering and the appearance of a low-temperature impact fracture at the temperature of minus 40 ℃, as shown in figure 16.
The upper and lower limit values and interval values of the process parameters (such as chemical component mass percentage, temperature, time and the like) of the invention can realize the invention, and the examples are not listed.
In conclusion, the invention provides the wear-resistant steel plate with the basket-knitted martensite metallographic structure and the production method thereof, which are developed aiming at the poor cold-bending forming performance and welding performance of the wear-resistant steel plate produced by the prior art, and the alloy content is reduced without adopting alloy elements such as Cr, Mo, Nb and the like; the smelting of Ti oxide is adopted in the steel making; the tempering process temperature is increased; the wear-resistant steel plates (NM400, NM450 and NM500) of all levels are flexibly produced, the cold roll forming performance and the welding performance of the wear-resistant steel plates are effectively improved, and the requirements for use in extremely cold regions can be met.
Claims (3)
1. The utility model provides a wear-resisting steel sheet with basket weaving martensite metallographic structure which characterized in that: the wear-resistant steel plate comprises the following chemical components in percentage by mass: c = 0.15-0.25, Si = 0.8-2.0, Mn = 1.0-2.0, P is less than or equal to 0.020, S is less than or equal to 0.005, Ti = 0.070-0.20, B = 0.0010-0.0025, and the balance is Fe and inevitable impurities; the metallographic structure of the wear-resistant steel plate is a basket-woven martensite structure formed by shearing and growing of an original austenite crystal inner nucleation.
2. A method for producing wear-resistant steel plates with basket-knitted martensite metallographic structures is characterized by comprising the following steps of: the method comprises the following steps:
(1) steel-making and slab production: producing a high-quality plate blank by adopting Ti oxide metallurgy technology;
(2) rolling a steel plate: adopting a controlled rolling technology to produce a steel plate with corresponding thickness;
(3) off-line quenching: quenching and heating at 890-910 ℃ for no less than 30min, and cooling;
(4) tempering, heating at 200-400 deg.C for 4-5 min/mm × plate thickness, and air cooling.
3. The method for producing a wear-resistant steel sheet having a basket-knitted martensitic microstructure as claimed in claim 2, wherein the furnace time in the step (3) is 1.8min/mm × sheet thickness.
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| CN113025916A (en) * | 2021-03-04 | 2021-06-25 | 河北普阳钢铁有限公司 | Q355NE steel plate for right-angle bending and production method thereof |
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