CN116288015A - Wear-resistant steel plate and production method thereof - Google Patents
Wear-resistant steel plate and production method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 48
- 239000010959 steel Substances 0.000 title claims abstract description 48
- 238000004519 manufacturing process Methods 0.000 title claims description 5
- 238000010438 heat treatment Methods 0.000 claims abstract description 33
- 238000005096 rolling process Methods 0.000 claims abstract description 31
- 238000000034 method Methods 0.000 claims abstract description 19
- 238000009749 continuous casting Methods 0.000 claims abstract description 15
- 238000003723 Smelting Methods 0.000 claims abstract description 9
- 239000000126 substance Substances 0.000 claims abstract description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 6
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 5
- 238000007670 refining Methods 0.000 claims abstract description 5
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 4
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 4
- 238000005452 bending Methods 0.000 claims abstract description 3
- 239000012535 impurity Substances 0.000 claims abstract description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 3
- 238000010079 rubber tapping Methods 0.000 claims description 14
- 238000010791 quenching Methods 0.000 claims description 10
- 230000000171 quenching effect Effects 0.000 claims description 10
- 238000005496 tempering Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 6
- 229910001096 P alloy Inorganic materials 0.000 claims description 4
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 4
- 238000005275 alloying Methods 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- 238000002791 soaking Methods 0.000 claims description 4
- 230000001276 controlling effect Effects 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 238000009489 vacuum treatment Methods 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 238000009849 vacuum degassing Methods 0.000 abstract 1
- 229910052799 carbon Inorganic materials 0.000 description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 238000005070 sampling Methods 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229910000604 Ferrochrome Inorganic materials 0.000 description 2
- 229910000616 Ferromanganese Inorganic materials 0.000 description 2
- 229910000914 Mn alloy Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- CYUOWZRAOZFACA-UHFFFAOYSA-N aluminum iron Chemical compound [Al].[Fe] CYUOWZRAOZFACA-UHFFFAOYSA-N 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 description 2
- PYLLWONICXJARP-UHFFFAOYSA-N manganese silicon Chemical compound [Si].[Mn] PYLLWONICXJARP-UHFFFAOYSA-N 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 239000010426 asphalt Substances 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000013585 weight reducing agent Substances 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
-
- 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
-
- 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
- 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
- C22C38/04—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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
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- 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 wear-resistant steel plate comprises the following chemical components, by weight, C=0.25 to 0.28%, si=0.15 to 0.45%, mn=0.95 to 1.25%, P is less than or equal to 0.012%, S is less than or equal to 0.005%, cr=0.45 to 0.75%, ni=0.40 to 0.70%, nb=0.010 to 0.030%, ti=0.008 to 0.030%, al=0.060 to 0.090%, B=0.0012 to 0.0035%, H is less than or equal to 0.0002%, N is less than or equal to 0.0060%, O is less than or equal to 0.0015%, and the balance Fe and unavoidable impurities; the process steps comprise converter smelting, LF refining, vacuum degassing, continuous casting, heating, rolling and heat treatment. The produced wear-resistant steel plate has the surface hardness of 470-540 HBW, the yield strength of 1300-1480 MPa, the tensile strength of 1550-1750 MPa, the elongation of more than or equal to 12 percent, and the requirements of 4a radius of 90 degrees cold bending, 0 ℃ impact Akv of more than or equal to 70J, 20 ℃ impact Akv of more than or equal to 40J and 40 ℃ impact Akv of more than or equal to 30J are met.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and relates to a wear-resistant steel plate and a production method thereof.
Background
The wear-resistant steel is widely applied to industries such as engineering machinery, coal machinery, agricultural machinery and the like, and has higher wear resistance and hardness requirements and poorer impact resistance. However, the wear-resistant steel for the cutting boards of the excavator and the electric shovel is required to have not only excellent wear resistance but also a certain impact resistance, so that the high requirements on hardness and impact resistance are simultaneously met.
Disclosure of Invention
The invention aims to provide a wear-resistant steel plate and a production method thereof, wherein the thickness specification of the produced wear-resistant steel plate is 6-30 mm, the requirements of high wear resistance and high impact toughness are met, the hardness is 470-540 HBW, the yield strength is 1300-1480 MPa, the tensile strength is 1550-1750 MPa, the elongation is more than or equal to 12%, the radius of 4a is 90 degrees, the impact Akv at 0 ℃ is more than or equal to 70J, the impact Akv at-20 ℃ is more than or equal to 40J, and the impact Akv at 40 ℃ is more than or equal to 30J.
The technical scheme of the invention is as follows:
the steel comprises the chemical components of C=0.25-0.28%, si=0.15-0.45%, mn=0.95-1.25%, P is less than or equal to 0.012%, S is less than or equal to 0.005%, cr=0.45-0.75%, ni=0.40-0.70%, nb=0.010-0.030%, ti=0.008-0.030%, al=0.060-0.090%, B=0.0012-0.0035%, H is less than or equal to 0.0002%, N is less than or equal to 0.0060%, O is less than or equal to 0.0015%, and the balance Fe and unavoidable impurities; the key process steps comprise:
(1) Smelting in a converter: controlling the tapping temperature of the top-bottom combined blown converter to 1590-1620 ℃, wherein the tapping P of the converter is less than or equal to 0.010%, and adding a deoxidizer and an alloy for deoxidizing alloying in the tapping process, wherein the alloy adopts a low P alloy, so that the expansion P of molten steel is avoided;
(2) Refining: the chemical components of the ladle molten steel are accurately regulated after the LF furnace is powered on and heated up, and then the ladle molten steel enters an RH furnace or a VD furnace for vacuum treatment, wherein the molten steel is not more than 0.0002 percent, N is not more than 0.0060 percent and O is not more than 0.0015 percent;
(3) Continuous casting: the superheat degree of the tundish is 12-25 ℃, the internal quality of the continuous casting billet is improved by adopting a dynamic soft pressing or heavy pressing technology in continuous casting, the thickness dimension of the continuous casting billet is 180-450 mm, and the width dimension is 1700-2500 mm;
(4) Heating: the slab is hot-packed or cold-packed, the temperature of the preheating section is 650-800 ℃, the temperature of the heating section is 1100-1260 ℃, the temperature of the soaking section is 1150-1240 ℃, and the furnace time is 120-300 min;
(5) Rolling: adopting two-stage controlled rolling, wherein the rough rolling temperature is 1150-980 ℃, the rough rolling accumulated compression ratio is more than or equal to 2, the thickness of an intermediate billet is 60-90 mm, the finish rolling initial rolling temperature is 880-990 ℃, the finish rolling accumulated compression ratio is more than or equal to 2.5, the finish rolling final rolling temperature is 760-840 ℃, water cooling is adopted after rolling, and the final cooling temperature is 660-720 ℃;
(6) And (3) heat treatment: adopting a quenching and tempering process, wherein the quenching heating temperature is 850-900 ℃, the heating speed is 1.4-2.2 min/mm, the heat preservation time is 10-30 min, and the quenching cooling rate is 20-40 ℃/s; tempering heating temperature is 180-230 ℃, heating speed is 3.0-4.5 min/mm, and heat preservation time is 10-20 min.
The wear-resistant steel plate obtained by the method has 490-540 HBW surface hardness, 1300-1480 MPa yield strength, 1550-1750 MPa tensile strength, elongation of more than or equal to 12 percent, and meets the requirements of 4a radius of 90 degrees cold bending, 0 ℃ impact Akv of more than or equal to 70J, 20 ℃ impact Akv of more than or equal to 40J and 40 ℃ impact Akv of more than or equal to 30J.
The principle of the invention: the wear-resistant steel has excellent mechanical property, impact property and wear resistance matching. The hardenability and impact toughness of the steel plate are ensured through proper control of C, and the hardness of the steel plate is reduced when the C is too high and the toughness is too low, so that the C content is designed to be 0.25-0.28%; si, mn, cr, B, the hardenability of the steel plate is improved by reasonable matching, and the consistency of the steel plate in the full thickness range is ensured; ni is added to further improve toughness of the steel; the addition of Nb, ti and Al can refine grains and form carbonitride to improve the comprehensive mechanical property and wear resistance of the steel plate; p, S, H, N, O, and reduces the influence of harmful inclusions so as to improve the comprehensive mechanical properties of the steel plate. In addition, the temperature of the preheating section of the slab is controlled, surface or internal cracks are avoided in the heating process of the slab, the austenite grain size before heat treatment is refined through two-stage rolling control, and the quenching and tempering process of quenching and low-temperature tempering finally achieves excellent comprehensive performance.
The invention has the beneficial effects that: the wear-resistant steel produced by the method has the characteristics of high hardness and high toughness, and has excellent comprehensive mechanical properties, and the mechanical properties are as follows: the hardness is 470-540 HBW, the yield strength is 1300-1480 MPa, the tensile strength is 1550-1750 MPa, the elongation is more than or equal to 12%, the 4a radius 90-degree cold bend is satisfied, the 0 ℃ impact Akv is more than or equal to 70J, the-20 ℃ impact Akv is more than or equal to 40J, and the-40 ℃ impact Akv is more than or equal to 30J. The high-strength high-toughness high-strength high-wear-resistance steel product can be used for wear-resistant structural parts such as crushers, vibrating screens, feed hoppers, loaders, excavators, bulldozers, buckets and blades, coal shovels, coal conveying machines, scraper conveyors, dump trucks, mine cars, pavers, asphalt mixing stations, cutters, gears, slurry pipeline systems, cement plant equipment, screw conveyors and the like, and can effectively realize equipment weight reduction due to excellent toughness and wear resistance.
Drawings
FIG. 1 is a photograph of a metallographic structure of an embodiment of the present invention.
Detailed Description
Example 1
Smelting 1 furnace wear-resistant steel and producing steel plates with the specifications of 16mm, 20mm and 30mm respectively, wherein the chemical composition weight percentages of the steel are shown in table 1; the method comprises the following key process steps:
(1) Smelting in a converter: smelting by adopting a top-bottom combined blown converter, wherein the tapping temperature is 1615 ℃, the tapping endpoint P content of the converter is 0.009%, alloying is carried out in the tapping process, deoxidizers such as aluminum iron, aluminum blocks and the like are added, and low-carbon ferrochrome, silicon-manganese alloy, electrolytic nickel, medium-carbon ferromanganese, medium-carbon ferroboron and other low-phosphorus alloys are added;
(2) Refining: heating to 1580 ℃ in the initial stage of an LF furnace, sampling for fine adjustment of components, vacuumizing the molten steel after component adjustment in an RH furnace, keeping vacuum for 10min, performing soft blowing and standing for 15min after the vacuum breaking, and sampling and detecting H=0.00013%, N=0.0043% and O=0.0008%;
(3) Continuous casting: the liquidus line of molten steel is about 1508 ℃, the ladle temperature is controlled to 1520-1524 ℃, dynamic light pressure is adopted in continuous casting, and the section size of a continuous casting billet is 300 multiplied by 2070mm;
(4) Heating: the steel plate is heated by adopting a hot feeding and hot charging process, the temperature of the plate blank entering the furnace is 350-500 ℃, and the heating system is as follows: preheating section 800 ℃, heating section 1100-1260 ℃, soaking section 1180-1220 ℃, slab tapping temperature 1200-1220 ℃ and furnace time 240-260 min;
(5) Rolling: rolling steel plates with the specifications of 16mm, 20mm and 30mm by adopting two-stage controlled rolling, wherein the rolling process parameters are shown in Table 2;
(6) And (3) heat treatment: the quenching heating temperature is 890 ℃, the tempering temperature is 220 ℃, and the detailed heat treatment parameters are shown in Table 3.
The mechanical property detection results of the obtained steel plates are shown in Table 4.
Example 2
Smelting 1 furnace wear-resistant steel and producing steel plates with the specifications of 8mm, 12mm, 20mm and 30mm respectively, wherein the chemical composition weight percentages of the steel are shown in table 1; the method comprises the following key process steps:
(1) Smelting in a converter: smelting by adopting a top-bottom combined blown converter, wherein the tapping temperature is 1608 ℃, the tapping end point P content of the converter is 0.006%, alloying is carried out in the tapping process, deoxidizers such as aluminum iron, aluminum blocks and the like are added, and low-carbon ferrochrome, silicon-manganese alloy, electrolytic nickel, medium-carbon ferromanganese, medium-carbon ferroboron and other low-phosphorus alloys are added;
(2) Refining: heating to 1603 ℃ in the initial stage of the LF furnace, sampling for fine adjustment of components, vacuum-pumping the molten steel after component adjustment in the VD furnace for 12min in vacuum, soft blowing and standing for 25min after the vacuum breaking, and sampling and detecting H=0.00016%, N=0.0038% and O=0.0008%;
(3) Continuous casting: the liquidus of molten steel is about 1513 ℃, the ladle temperature is controlled to 1525-1528 ℃, dynamic light pressure is adopted in continuous casting, and the section size of a continuous casting billet is 260 multiplied by 2070mm;
(4) Heating: the steel plate is heated by adopting a hot feeding and hot charging process, the temperature of the plate blank entering the furnace is 350-500 ℃, and the heating system is as follows: the preheating section is 800 ℃, the heating section is 1100-1260 ℃, the soaking section is 1180-1220 ℃, the slab tapping temperature is 1200-1220 ℃, and the furnace time is 200-230 min;
(5) Rolling: rolling steel plates with the specifications of 8, 12, 20 and 30mm by adopting two-stage controlled rolling, wherein the rolling process parameters are shown in Table 2;
(6) And (3) heat treatment: the quenching heating temperature is 850 ℃, the tempering temperature is 190 ℃, and the detailed heat treatment parameters are shown in Table 3.
The mechanical property detection results of the obtained steel plates are shown in Table 4.
Table 1 example chemical composition mass percent (wt.%)
Table 2 example rolling process parameters
Table 3 example heat treatment process parameters
Table 4 results of mechanical property measurements of examples
Note that: the 8mm impact is a thinned sample, and the size is 5mm multiplied by 10mm; impact of 12mm, 16mm, 20mm, 30mm was used as a standard specimen, and the dimensions were 10mm×10mm.
Claims (1)
1. A production method of a wear-resistant steel plate is characterized by comprising the following steps: the steel comprises the chemical components of, by weight, C=0.25 to 0.28%, si=0.15 to 0.45%, mn=0.95 to 1.25%, P.ltoreq.0.012%, S.ltoreq.0.005%, cr=0.45 to 0.75%, ni=0.40 to 0.70%, nb=0.010 to 0.030%, ti=0.008 to 0.030%, al=0.060 to 0.090%, B=0.0012 to 0.0035%, H.ltoreq.0.0002%, N.ltoreq.0.0060%, O.ltoreq.0.0015%, and the balance Fe and unavoidable impurities; the key process steps comprise:
(1) Smelting in a converter: controlling the tapping temperature of the top-bottom combined blown converter to 1590-1620 ℃, wherein the tapping P of the converter is less than or equal to 0.010%, and adding a deoxidizer and an alloy for deoxidizing alloying in the tapping process, wherein the alloy adopts a low P alloy, so that the expansion P of molten steel is avoided;
(2) Refining: the chemical components of the ladle molten steel are accurately regulated after the LF furnace is powered on and heated up, and then the ladle molten steel enters an RH furnace or a VD furnace for vacuum treatment, wherein the molten steel is not more than 0.0002 percent, N is not more than 0.0060 percent and O is not more than 0.0015 percent;
(3) Continuous casting: the superheat degree of the tundish is 12-25 ℃, the internal quality of the continuous casting billet is improved by adopting a dynamic soft pressing or heavy pressing technology in continuous casting, the thickness dimension of the continuous casting billet is 180-450 mm, and the width dimension is 1700-2500 mm;
(4) Heating: the slab is hot-packed or cold-packed, the temperature of the preheating section is 650-800 ℃, the temperature of the heating section is 1100-1260 ℃, the temperature of the soaking section is 1150-1240 ℃, and the furnace time is 120-300 min;
(5) Rolling: adopting two-stage controlled rolling, wherein the rough rolling temperature is 1150-980 ℃, the rough rolling accumulated compression ratio is more than or equal to 2, the thickness of an intermediate billet is 60-90 mm, the finish rolling initial rolling temperature is 880-990 ℃, the finish rolling accumulated compression ratio is more than or equal to 2.5, the finish rolling final rolling temperature is 760-840 ℃, water cooling is adopted after rolling, and the final cooling temperature is 660-720 ℃;
(6) And (3) heat treatment: adopting a quenching and tempering process, wherein the quenching heating temperature is 850-900 ℃, the heating speed is 1.4-2.2 min/mm, the heat preservation time is 10-30 min, and the quenching cooling rate is 20-40 ℃/s; tempering heating temperature is 180-230 ℃, heating speed is 3.0-4.5 min/mm, heat preservation time is 10-20 min, wear-resistant steel plate is obtained, surface hardness is 490-540 HBW, yield strength is 1300-1480 MPa, tensile strength is 1550-1750 MPa, elongation is more than or equal to 12%, 4a radius is 90 DEG cold bending is satisfied, 0 ℃ impact Akv is more than or equal to 70J, 20 ℃ impact Akv is more than or equal to 40J, and 40 ℃ impact Akv is more than or equal to 30J.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116926431A (en) * | 2023-08-03 | 2023-10-24 | 湖南华菱湘潭钢铁有限公司 | High-strength high-toughness NM450 wear-resistant steel plate and production method thereof |
| CN117107155A (en) * | 2023-08-27 | 2023-11-24 | 湖南华菱湘潭钢铁有限公司 | Low-carbon-equivalent high-toughness NM400 wear-resistant steel plate and production method thereof |
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2023
- 2023-04-23 CN CN202310438988.9A patent/CN116288015A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116926431A (en) * | 2023-08-03 | 2023-10-24 | 湖南华菱湘潭钢铁有限公司 | High-strength high-toughness NM450 wear-resistant steel plate and production method thereof |
| CN117107155A (en) * | 2023-08-27 | 2023-11-24 | 湖南华菱湘潭钢铁有限公司 | Low-carbon-equivalent high-toughness NM400 wear-resistant steel plate and production method thereof |
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