CN114164332B - Production method of high-temperature-wear-resistant and wear-resistant steel plate - Google Patents
Production method of high-temperature-wear-resistant and wear-resistant steel plate Download PDFInfo
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- CN114164332B CN114164332B CN202111420423.5A CN202111420423A CN114164332B CN 114164332 B CN114164332 B CN 114164332B CN 202111420423 A CN202111420423 A CN 202111420423A CN 114164332 B CN114164332 B CN 114164332B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 62
- 239000010959 steel Substances 0.000 title claims abstract description 62
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- 238000005096 rolling process Methods 0.000 claims abstract description 57
- 238000010438 heat treatment Methods 0.000 claims abstract description 32
- 238000005496 tempering Methods 0.000 claims abstract description 31
- 238000010791 quenching Methods 0.000 claims abstract description 26
- 230000000171 quenching effect Effects 0.000 claims abstract description 26
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000000126 substance Substances 0.000 claims abstract description 7
- 238000003723 Smelting Methods 0.000 claims abstract description 3
- 238000009749 continuous casting Methods 0.000 claims abstract description 3
- 238000001514 detection method Methods 0.000 claims abstract description 3
- 238000007689 inspection Methods 0.000 claims abstract description 3
- 229910052742 iron Inorganic materials 0.000 claims abstract description 3
- 238000007670 refining Methods 0.000 claims abstract description 3
- 238000009489 vacuum treatment Methods 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 32
- 238000001816 cooling Methods 0.000 claims description 14
- 230000001186 cumulative effect Effects 0.000 claims description 2
- 238000001953 recrystallisation Methods 0.000 claims 1
- 239000011573 trace mineral Substances 0.000 abstract description 6
- 235000013619 trace mineral Nutrition 0.000 abstract description 6
- 229910052720 vanadium Inorganic materials 0.000 abstract description 4
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 2
- 238000005299 abrasion Methods 0.000 description 7
- 230000032683 aging Effects 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000010079 rubber tapping Methods 0.000 description 4
- 238000002791 soaking Methods 0.000 description 4
- 229910001566 austenite Inorganic materials 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910000734 martensite Inorganic materials 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 229910000599 Cr alloy Inorganic materials 0.000 description 1
- 229910001182 Mo alloy Inorganic materials 0.000 description 1
- 229910000756 V alloy Inorganic materials 0.000 description 1
- 210000003850 cellular structure Anatomy 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
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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
- C21D8/0205—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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- 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
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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
- 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
- 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
- C22C33/06—Making ferrous alloys by melting using master alloys
-
- 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
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
-
- 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
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
-
- 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
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
-
- 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
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- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The production process of the high temperature wear resistant steel comprises the steps of molten iron pretreatment, converter smelting, LF external refining, VD vacuum treatment, continuous casting, heating, rolling, straightening, quenching, tempering, finishing, performance inspection and flaw detection; the steel comprises the following chemical components in percentage: c C =0.15 to 0.20%, si is less than or equal to 0.10%, mn is 1.00 to 1.50%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, mo is 0.30 to 0.60%, cr is 0.60 to 1.0%, V is 0.08 to 0.12%, ti is less than or equal to 0.025%, als is 0.060 to 0.10%, B is 0.0008 to 0.0025%, and the balance is Fe and other trace elements. The invention provides a production method of NM360 and NM400 wear-resistant steel, which can still meet standard requirements in the use hardness under the high-temperature environment of 300-500 ℃, and the production method can reduce high-temperature wear and prolong the service life of the steel.
Description
Technical Field
The invention belongs to the technical field of steelmaking, and particularly relates to a production method of high-temperature-wear-resistant and wear-resistant steel.
Background
The wear-resistant steel is a steel material suitable for various wear working conditions and is widely applied to the equipment fields of coal mine machinery, engineering machinery, ore transportation vehicles and the like. The working conditions of the wear-resistant equipment are different in actual use, the hardness loss of the common wear-resistant steel is serious at the working temperature of 300 ℃, and the wear resistance is rapidly reduced. Under specific working conditions, such as loading of substances such as high-temperature steel slag and the like, the high-temperature environment seriously affects the wear resistance of the wear-resistant steel and the service life of equipment.
Most of the currently used wear-resistant steels are common wear-resistant steels, the performance indexes of which mainly ensure the strength, hardness and toughness, and the production process generally adopts quenching and low-temperature tempering at about 200 ℃. According to the method, ni, cr and Mo hardenability elements and Nb, V and Ti fine crystal elements are added, and the rolled steel plate is quenched at 925+/-10 ℃ and tempered at 230+/-5 ℃ to obtain the wear-resistant steel with the Brinell hardness value of 470-510 HBW and the longitudinal impact energy at-20 ℃ of more than or equal to 35J. CN201711058288.8 'a wear-resistant steel plate with low-temperature impact toughness and a preparation method thereof', the method is characterized in that the surface hardness of the produced steel plate is HBW 360-HBW 460 through quenching at 860-910 ℃ and tempering at 150-250 ℃, the low-temperature impact energy at minus 40 ℃ reaches more than 50J, and the production process mainly focuses on improving the impact toughness of the wear-resistant steel. CN101775539A is a high-toughness wear-resistant steel plate and a manufacturing method thereof, wherein the carbon content C is 0.04-0.11 wt%, the carbon content is low, and proper amount of alloy is added to improve the impact toughness of NM 360.
The production method related to the patent mainly improves the hardness and the low-temperature impact toughness, the tempering temperature is generally about 200 ℃, the use environment temperature is mostly normal temperature, and the hardness is not influenced. When the service environment temperature exceeds 300 ℃, the hardness is obviously reduced, the abrasion of the abrasion-resistant part is accelerated, and the service life is seriously influenced.
Disclosure of Invention
The invention aims to provide a production method of high-temperature wear-resistant and abrasion-resistant steel, wherein various performance indexes of the produced steel plate meet standard requirements, and the hardness of the steel plate is not obviously reduced when the steel plate is used at 300-500 ℃.
The technical scheme of the invention is as follows:
a production method of high-temperature wear-resistant and abrasion-resistant steel comprises the following steps of molten iron pretreatment, converter smelting, LF external refining, VD vacuum treatment, continuous casting, heating, rolling, straightening, quenching, tempering, finishing, performance inspection and flaw detection. The steel comprises the following chemical components, by weight, C=0.15-0.20, si is less than or equal to 0.10, mn=1.00-1.50, P is less than or equal to 0.015, S is less than or equal to 0.005, mo=0.30-0.60, cr=0.60-1.0, V=0.08-0.12, ti is less than or equal to 0.025, als=0.060-0.10, B=0.0008-0.0025, and the balance of Fe and other microelements. The key process steps comprise:
(1) The plate blank is heated and discharged at 1200-1250 ℃ for 30-50 minutes; rough rolling ensures that the three single pass reduction is more than or equal to 30mm;
(2) The initial rolling temperature of the finish rolling is less than or equal to Tnr, the cumulative rolling reduction is more than or equal to 50%, and the final rolling model temperature of the finish rolling Ar < 3+ > (50-150) DEGC;
(3) The cooling process comprises the following steps: performing online quenching after rolling, wherein the cooling speed is more than or equal to 30 ℃/s, and the reddening temperature is less than or equal to Msf;
(4) An off-line heat treatment process comprises the following steps: the quenching temperature AC < 3+ > (20-30) DEG C, the heating time is plate thickness +30min when the thickness is less than or equal to 20mm, and the heating time is 2.5 times of plate thickness when the thickness is more than 20 mm; the tempering temperature is 500-550 ℃, and the tempering time is 4 times of the plate thickness.
Where Tnr is the critical temperature of rolling unrecrystallized, and Ar3 is the starting temperature of ferrite transformation upon cooling.
Further, the hardness of the abrasion-resistant steel is 360HB, the abrasion-resistant steel is easy to weld and easy to mold, the chemical composition of the steel is as follows: c=0.15 to 0.17%, si is less than or equal to 0.10%, mn=1.00 to 1.15%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, mo=0.30 to 0.40%, cr=0.60 to 0.80%, v=0.08 to 0.10%, ti is less than or equal to 0.025%, als=0.060 to 0.10%, b=0.0008 to 0.0025%, and the balance being Fe and other microelements. Preferably, in the key process steps, the finish rolling start temperature is less than or equal to 950 ℃, the finish rolling temperature is 790-840 ℃, the quenching temperature is 880-890 ℃, and the tempering temperature is 530-550 ℃.
Further, the hardness 400HB of the easily welded and easily molded wear-resistant steel comprises, by weight, C=0.18 to 0.20, si less than or equal to 0.10, mn=1.16 to 1.30, P less than or equal to 0.015, S less than or equal to 0.005, mo=0.41 to 0.50, cr=0.81 to 1.0%, V=0.11 to 0.12, ti less than or equal to 0.025, als=0.060 to 0.10, B=0.0008 to 0.0025, and the balance of Fe and other trace elements.
Preferably, in the key process steps, the finish rolling start temperature is less than or equal to 970 ℃, the finish rolling temperature is 810-860 ℃, the quenching temperature is 870-880 ℃, and the tempering temperature is 500-520 ℃.
The principle of the invention:
the chemical composition design: the increase of the C content is beneficial to improving the strength and the hardness of the steel, the weldability is greatly reduced when the carbon content is more than or equal to 0.30, and the low carbon content influences the hardenability and the hardenability of the steel. The hardenability of the wear-resistant steel plate is improved by utilizing Cr, mo and B, the uniformity of the thickness section structure and the hardness performance is ensured, and meanwhile, the tempering softening resistance is improved by utilizing the precipitation of Cr, mo and V in the tempering process. Besides good deoxidizing capability, the Al can refine essential grains of steel, in addition, the Al element can be combined with N to play a role in nitrogen fixation of B-containing steel, and the ideal Al content is controlled to be 0.060-0.10% by combining with the actual N control range.
The rolling process comprises the following steps: the heating temperature of the blank is low, alloy components cannot be completely dissolved in solid, and the abnormal growth of crystal grains can be caused by the excessive heating temperature. According to the invention, a certain amount of Cr, mo and V alloy is added, the alloy elements are ensured to be dissolved in solid as much as possible in the heating process, the coarsening temperature of steel is increased by utilizing Al elements, rapid growth of crystal grains in the heating process is prevented, and the heating temperature is controlled to be 1200-1250 ℃.
The heat treatment process comprises the following steps: the deformed austenite substructure of the unrecrystallized area is inherited through online quenching after rolling, and martensite laths are thinned, so that fine original grains are provided for the subsequent offline quenching process. And determining an off-line quenching process, calculating the AC3 temperature according to the chemical composition of the steel, and controlling the heating temperature on the premise of ensuring the solid solution of the alloy to prevent abnormal growth of crystal grains. The heating time affects the uniformity of the composition and tissue, and is controlled to achieve a desired uniform tissue. The wear-resistant steel is generally tempered at a low temperature, dislocation gradually merges and disappears along with the rise of the tempering temperature, the structure is restored, and the strength and the hardness are gradually reduced. In order to ensure that the hardness of the steel is not obviously reduced in the use process, the tempering temperature of the steel is required to be higher than the use environment temperature, and the tempering temperature designed by the invention is 500-550 ℃.
According to the technical scheme of the invention, the high-temperature wear resistant and abrasion resistant steel with the specification of 8-50mm can reach the following performance indexes:
NM360: tensile strength is more than or equal to 1100MPa, and surface hardness: 330-390HBW, the impact energy at minus 40 ℃ is more than or equal to 35J, the isothermal aging is carried out for 8 hours at 300 ℃, 400 ℃ and 500 ℃, the hardness meets 330-390HBW, and the impact energy at minus 40 ℃ is more than or equal to 24J.
NM400: tensile strength is more than or equal to 1200MPa, and surface hardness: 370-430HBW, the impact energy at minus 20 ℃ is more than or equal to 35J, the isothermal aging is carried out for 8 hours at 300 ℃, 400 ℃ and 500 ℃, the hardness meets 370-430HBW, and the impact energy at minus 40 ℃ is more than or equal to 24J.
The invention has the beneficial effects that: the non-recrystallized region is rolled under control, so that austenite is transformed into deformation accumulated austenite which appears in the forms of dislocation, deformation zone, cellular structure and the like, the phase transformation nucleation position is increased, and the grains are refined; the phase change driving force is increased by the large cooling speed, and the grain structure is further refined; the unique component design is utilized to refine the essential grains, and the uniform and fine grain size of the steel is controlled by the on-line quenching and off-line quenching technology, so that good low-temperature impact toughness is obtained; by using multiple carbide-forming elements, the disappearance of martensite dislocation is delayed in the tempering process, and V is precipitated at the same time 4 C 3 、Mo 2 C and Cr 7 C 3 The carbide particles have high hardness, so that the loss of tempering hardness is reduced, and the tempering stability and tempering softening resistance of the wear-resistant steel are improved.
Detailed Description
The present invention will be further described with reference to examples.
Example 1: production of 12mmNM360 steel plate
The steel comprises the following components in percentage by mass: c=0.16, si=0.07, mn=1.05, p is less than or equal to 0.012, s is less than or equal to 0.002, mo=0.32, cr=0.65, v=0.085, ti=0.008, als=0.072, b=0.0013, the balance being Fe and other trace elements; the key process steps comprise:
(1) The heating tapping temperature of the plate blank is 1230 ℃, and the soaking time is 38 minutes; rough rolling, wherein three single pass reduction of 35, 33 and 36mm;
(2) The finish rolling initial rolling temperature is 950, the accumulated rolling reduction is 63%, and the finish rolling final rolling temperature is 800-830 ℃;
(3) The cooling process comprises the following steps: carrying out online quenching after rolling, wherein the average cooling speed is 41 ℃/s, and the reddening temperature is less than or equal to 210 ℃;
(4) An off-line heat treatment process comprises the following steps: quenching temperature is 880 ℃, and heating time is 42min; tempering temperature is 540 ℃, and tempering time is 48min.
Example 2: production of 30mmNM360 steel plate
The steel comprises the following components in percentage by mass: c=0.17, si=0.08, mn=1.10, p.ltoreq.0.009, s.ltoreq.0.001%, mo=0.35, cr=0.72, v=0.093, ti=0.010, als=0.079, b=0.0015, the balance being Fe and other trace elements; the key process steps comprise:
(1) The heating tapping temperature of the plate blank is 1235 ℃, and the soaking time is 41 minutes; rough rolling, wherein three single pass reduction amounts 33, 32 and 30mm;
(2) The initial rolling temperature of finish rolling is 890, the accumulated rolling reduction is 55%, and the final rolling temperature of finish rolling is 800-840 ℃;
(3) The cooling process comprises the following steps: carrying out online quenching after rolling, wherein the average cooling speed is 36 ℃/s, and the reddening temperature is less than or equal to 200 ℃;
(4) An off-line heat treatment process comprises the following steps: quenching temperature 890 ℃, heating time 75min; tempering temperature is 530 ℃, and tempering time is 120min.
Example 3: production of 10mmNM400 steel sheet
The steel comprises the following components in percentage by mass: c=0.18, si=0.05, mn=1.21, p=0.010, s=0.001, mo=0.43, cr=0.90%, v=0.113, ti=0.011, als=0.081, b=0.0017, the balance being Fe and other trace elements; the key process steps comprise:
(1) The heating tapping temperature of the plate blank is 1233 ℃, and the soaking time is 45 minutes; rough rolling, wherein three single pass reduction of 35, 33 and 37mm;
(2) The initial rolling temperature of finish rolling is 970, the accumulated rolling reduction is 65%, and the final rolling temperature of finish rolling is 810-850 ℃;
(3) The cooling process comprises the following steps: carrying out online quenching after rolling, wherein the average cooling speed is 42 ℃/s, and the reddening temperature is less than or equal to 200 ℃;
(4) An off-line heat treatment process comprises the following steps: quenching temperature is 870 ℃, and heating time is 40min; tempering temperature is 520 ℃ and tempering time is 40min.
Example 4: production of 50mmNM400 steel sheet
The steel comprises the following components in percentage by mass of C=0.20, si=0.09, mn=1.25, P=0.007, S is less than or equal to 0.002, mo=0.47, cr=0.95, V=0.115, ti=0.012, als=0.077, B=0.0015 and the balance of Fe and other trace elements; the key process steps comprise:
(1) The heating tapping temperature of the plate blank is 1243 ℃ and the soaking time is 48 minutes; rough rolling, wherein three single pass reduction rates 31, 35 and 32mm;
(2) The initial rolling temperature of finish rolling is 850, the accumulated rolling reduction is 52%, and the final rolling temperature of finish rolling is 800-850 ℃;
(3) The cooling process comprises the following steps: carrying out online quenching after rolling, wherein the average cooling speed is 32 ℃/s, and the reddening temperature is less than or equal to 190 ℃;
(4) An off-line heat treatment process comprises the following steps: quenching temperature is 870 ℃, and heating time is 125min; tempering temperature is 500 ℃ and tempering time is 200min.
Table 1 tensile Strength after Heat treatment and isothermal aging of Steel sheets
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TABLE 2 Low temperature impact after heat treatment and isothermal aging treatment of Steel sheets
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TABLE 3 hardness of steel sheets after heat treatment and isothermal aging treatment
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Claims (5)
1. The production process of the high-temperature wear-resistant and wear-resistant steel comprises the steps of molten iron pretreatment, converter smelting, LF external refining, VD vacuum treatment, continuous casting, heating, rolling, straightening, quenching, tempering, finishing, performance inspection and flaw detection, and is characterized in that: the steel comprises the following chemical components in percentage by weight of C=0.15-0.20, si <0.10, mn=1.00-1.50, P < 0.015, S < 0.005, mo=0.30-0.60, cr=0.60-1.0, V=0.08-0.12, ti < 0.025, als=0.081-0.10, B=0.0008-0.0025, and the balance of Fe and other microelements; the key process steps comprise:
(1) The plate blank is heated and discharged at 1200-1250 ℃ for 30-50 minutes; rough rolling ensures that the three single pass reduction is more than or equal to 30mm;
(2) The initial rolling temperature of finish rolling is less than or equal to the non-recrystallization critical temperature of Tnr rolling, the cumulative rolling reduction is more than or equal to 50%, and the final rolling model temperature of finish rolling Ar < 3+ > (50-150) DEGC;
(3) The cooling process comprises the following steps: performing online quenching after rolling, wherein the cooling speed is more than or equal to 30 ℃/s, and the reddening temperature is less than or equal to Mf;
(4) An off-line heat treatment process comprises the following steps: the quenching temperature AC < 3+ > (20-30) DEG C, the heating time is plate thickness +30min when the thickness is less than or equal to 20mm, and the heating time is 2.5 times of plate thickness when the thickness is more than 20 mm; the tempering temperature is 500-550 ℃, and the tempering time is 4 times of the thickness of the plate.
2. The method for producing the high-temperature wear resistant steel according to claim 1, wherein the method comprises the following steps: the high-temperature resistant and wear-resistant steel with the hardness of 360HB comprises, by mass, C=0.15-0.17, si less than or equal to 0.10, mn=1.00-1.15, P less than or equal to 0.015, S less than or equal to 0.005, mo=0.30-0.40, cr=0.60-0.80, V=0.08-0.10, ti less than or equal to 0.025, als=0.060-0.10, B=0.0008-0.0025 and the balance of Fe and other microelements.
3. The method for producing the high-temperature wear resistant steel according to claim 2, wherein the method comprises the following steps: in the key process steps, the finish rolling start temperature is less than or equal to 950 ℃, the finish rolling temperature is 790-840 ℃, the quenching temperature is 880-890 ℃, and the tempering temperature is 530-550 ℃.
4. The method for producing a high temperature wear resistant steel according to claim 1, wherein: the high-temperature resistant and wear-resistant steel with the hardness of 400HB comprises, by mass, C=0.18-0.20, si less than or equal to 0.10, mn=1.16-1.30, P less than or equal to 0.015, S less than or equal to 0.005, mo=0.41-0.50, cr=0.81-1.0, V=0.11-0.12, ti less than or equal to 0.025, als=0.060-0.10, B=0.0008-0.0025 and the balance of Fe and other microelements.
5. The method for producing a high temperature wear resistant steel according to claim 4, wherein: in the key process steps, the finish rolling start temperature is less than or equal to 970 ℃, the finish rolling temperature is 810-860 ℃, the quenching temperature is 870-880 ℃, and the tempering temperature is 500-520 ℃.
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