AU2019101844A4 - Thick NM500 wear-resistant steel and production method therefor - Google Patents
Thick NM500 wear-resistant steel and production method therefor Download PDFInfo
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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
- 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
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel 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
- C22C38/40—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
Abstract
The present invention discloses a large-thickness NM500 wear-resistant steel,
which relates to the technical field of metallurgy. It comprises the following
chemical components by mass percentage: C: 0.26%-0.30%, Si: 0.20%-0.60%,
Mn: 0.60%-1.00%, P: <0.012%, S: <0.003%, Cr: 0.60%-0.90%, Mo:
0.35%-0.50%, Ni: 0.40%-0.60%, Ti: 0.008%-0.030%, Nb: 0.015%-0.050%, B:
0.0008%-0.0025%, Ceq: <0.75%, and the balance is Fe and unavoidable
impurities. The present invention is simple, easy to implement, short in
production process, low in cost, and the produced steel has excellent mechanical
properties, with large thickness, high hardness, good toughness and good welding
performance.
1/1
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444
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Fig. 2
Description
1/1
F4g. 444
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Fig. 2
THICK NM500 WEAR-RESISTANT STEEL AND PRODUCTION METHOD THEREFOR
The present invention relates to the field of metallurgical technology, in particular to a large-thickness NM500 wear-resistant steel and a production method thereof. BACKGROUNDART Compared with traditional wear-resistant cast steel, low-alloy wear-resistant steel plate has good comprehensive properties such as low alloy content, high low-temperature impact toughness, bendable for formation, and has the advantages of being flexible and convenient in production and low production cost. It is widely used in engineering, mining, construction, agriculture, cement, ports, power and metallurgy and other mechanical equipment manufacturing with harsh work conditions and requiring high strength and hardness and good wear resistance, such as bulldozers, loaders, excavators, dump trucks, ball mills and various mining machinery, grabs, stackers and reclaimers, conveying bending structures, etc. Such parts generally work in extremely harsh conditions such as dry and wet environments, and are difficult to replace. The steel plate is required to have high !0 strength and hardness, excellent wear resistance and good welding performance, etc. so as to ensure longer service life of the equipment. At present, there have been many patent reports on low-alloy wear-resistant steel. However, it is relatively thin, the uniformity of the cross-section hardness is not ideal, the welding performance is poor, and it cannot have excellent wear !5 resistance and corrosion resistance at the same time, which is difficult to satisfy the large-scale, lightweight and long-life requirements for equipment manufacturing. Especially, for low-alloy wear-resistant NM400 steel plates with a thickness of 90mm and a uniform cross-section, there are very few technologies that can be referred to.
Taking into account that the 90mm large-thickness wear-resistant steel plates with the best performance require not only high hardness and toughness but also good welding performance, and all requirements must be easy to produce and ensure low cost, in the present application the chemical components and production process of large-thickness NM500 wear-resistant steel plates are studied and a large-thickness NM500 wear-resistant steel and a production method thereof are designed. SUMMARY OF THE INVENTION In order to solve the above technical problems, the present invention provides a large-thickness NM500 wear-resistant steel, wherein it comprises the following chemical components by mass percentage: C: 0.26%-0.30%, Si: 0.20%-0.60%, Mn: 0.60%-1.00%, P: <0.012%, S: <0.003%, Cr: 0.60%-0.90%, Mo: 0.35%-0.50%, Ni: 0.40%-0.60%, Ti: 0.008%-0.030%, Nb: 0.015%-0.050%, B: 0.0008%-0.0025%, Ceq: <0.75%, Ceq=C+Mn/6+(Cr+Mo+V)/5+(Cu+Ni)/15 and the balance is Fe and unavoidable impurities.
Technical effects: The large-thickness NM500 wear-resistant steel and production method thereof provided by the present invention are simple, easy to implement, short in production process, low in cost, and the produced steel has excellent mechanical properties, with large thickness, high hardness, good !0 toughness and good welding performance.
The technical solution further limited by the present invention is as follows:
The aforementioned large-thickness NM500 wear-resistant steel, wherein it comprises the following chemical components by mass percentage: C: 0.27%, Si: 0.28%,Mn:0.83%,P:<0.009%,S:<0.0015%, Cr:0.80%,Ni:0.48%,Mo:0.45%, !5 Ti: 0.013%, B: 0.0015%, Alt: 0.033% and Ceq: 0.69%.
The aforementioned large-thickness NM500 wear-resistant steel, wherein it comprises the following chemical components by mass percentage: C: 0.28%, Si: 0.27%, Mn: 0.83%, P<0.009%, S<0.0020%, Cr: 0.79%, Ni: 0.49%, Mo: 0.43%,
Ti: 0.015%, B: 0.0016%, Alt: 0.033% and Ceq: 0.70%.
The aforementioned large-thickness NM500 wear-resistant steel, wherein it comprises the following chemical components by mass percentage: C: 0.28%, Si: 0.27%, Mn: 0.83%, P: <0.009%, S<0.0020%, Cr: 0.78%, Ni: 0.47%, Mo: 0.42%, Ti: 0.014%, B: 0.0015%, Alt: 0.033% and Ceq: 0.70%
Another object of the present invention is to provide a method for producing large-thickness NM500 wear-resistant steel, wherein it comprises the following processes: carrying out desulfurization pretreatment on molten iron, smelting in a converter, refining LF and RH, continuously casting, stacking casting blanks for slow-cooling, inspecting the casting blanks, judging the casting blanks, checking the casting blanks, pre-heating the casting blanks, heating the casting blanks, dephosphorizing, rolling, air cooling, carrying out flaw detection, shot blasting, quenching, tempering, straightening, cutting and sampling, spray printing logos, inspecting and storing, wherein
at the time of heating the casting blanks, the temperature in the heating zone is 1,180°C-1,230 0 C, the temperature in the soaking zone is controlled at 1,215°C-1,220C, the tapping temperature is 1,180°C-1,200C, and the time in furnace is 350min-420min;
two-stage rolling method is adopted during rolling, the initial rolling !0 temperature at the second stage is <9500 C, the thickness of the finished product is 90mm, the thickness of the temperature-holding casting blanks is controlled at 130mm or more, and the final rolling temperature at the second stage is 850°C-860C, and it is cooled in the air after rolling;
during quenching and tempering, the quenching temperature is controlled at !5 0 the heating rate is 1.5±0.1min/mm, and the time in furnace is 900°C-930 C, 170min-190min; after quenching, the tempering temperature is controlled at 150°C-220C, and the heating rate is 2.5 ±0.1min/mm, the time in furnace is 360min-450min, and it is slowly cooled to room temperature; and at the time of hot-rolled straightening, pre-straightening is first performed at 790°C-830 0 C.
The aforementioned method for producing a large-thickness NM500 wear-resistant steel, wherein during rolling, rolling in the recrystallization zone requires a pass reduction rate of>12% and a final rolling temperature of>9800 C, rolling in the recrystallization zone requires a cumulative reduction rate of>50%, and rolling in the non-recrystallization zone requires a cumulative reduction rate of >40%, the initial rolling temperature of <950 0 C and the final rolling temperature of
>830 0 C.
The aforementioned method for producing a large-thickness NM500 wear-resistant steel, wherein the thickness of the blanks is 320mm.
The beneficial effects of the present invention are as follows:
(1) The present invention is designed by adding a small amount of Cr, Ni and Mo alloy and Nb+Ti+V+B microalloying components, with carbon equivalent of <0.75, so as to lead to short production process and low cost;
(2) In the present invention, a reasonable controlled rolling process is adopted to produce a wear-resistant steel with a thickness of 90mm. Through the optimal heat treatment process, each mechanical performance index meets the material design standard requirements of large domestic and foreign machinery and !0 equipment enterprises, and the surface hardness is >470HB, the hardness in the
core is greater than 360HB, andAkv impact energy value at -200 C is >17J;
(3) The present invention successfully solves the technical difficulties of the influence of high hardness, low plasticity, low impact energy value and high carbon equivalent of the 90mm large thickness wear-resistant steel on welding !5 performance. The prepared steel has excellent mechanical properties, large thickness and high hardness, good toughness and good welding performance;
(4) In the present invention, due to the high strength of the 90mm steel plate after rolling, it needs to be pre-straightened at 790°C-840°C to ensure the original plate shape. On the basis of adhering to the low-cost production requirements, it can ensure that the quenching can be hardened. In the design, a small amount of Cr, Mo and B elements that can improve hardenability are added to a medium carbon so as to meet the requirements for producing high-level equipment from the view of improving the cooling speed;
(5) In the present invention, due to the high strength of the experimental steel, the 90mm steel plate is rolled at high temperature and high pressure in a controlled manner, and the overall compression ratio is higher than 3 times. Therefore, 320mm thick blanks are selected, and the soaking temperature is controlled at about 1,220°C. The time in furnace is properly extended to ensure the overall uniformity of the blank steel temperature and avoid "red and black" steel temperature;
(6) In the present invention, the thickness of the finished product is 90mm. In order to avoid the occurrence of core segregation during rolling to affect the strength and impact value, the two-stage rolling method is adopted, and the rolling deformation rate at the first stage is >50%. The total deformation rate at the second stage is >40% to ensure that there is no obvious difference between the surface and the core;
(7) The present invention successfully ensures that the production line with a rolling force of 12,000 tons can produce high-hardness, high-toughness and large-thickness wear-resistant steel, which is applied to large-scale domestic machinery and equipment, thereby greatly reducing the high cost due to relying on import.
!5 Brief Description of the Drawings
Fig. 1 and Fig. 2 are the metallographic photos of the 1/4 thickness and 1/2 thickness of the large-thickness NM500 wear-resistant steel after tempering at 180°C at a heating rate of 2.6min/mm and with time in furnace of 420min.
DETAILED DESCRIPTION Embodiment 1
A large-thickness NM500 wear-resistant steel provided by the present embodiment, wherein it comprises the following chemical components by mass percentage: C: 0.27%, Si: 0.28%, Mn: 0.83%, P: <0.009%, S: <0.0015%, Cr:
0.80%, Ni: 0.48%, Mo: 0.45%, Ti: 0.013%, B: 0.0015%, Alt: 0.033%, Ceq:
0.69%, Ceq=C+Mn/6+(Cr+Mo+V)/5+(Cu+Ni)/15, and the balance is Fe and unavoidable impurities.
The production method comprises the following processes: carrying out desulfurization pretreatment on molten iron, smelting in a converter, refining LF and RH, continuously casting, stacking casting blanks for slow-cooling, inspecting the casting blanks, judging the casting blanks, checking the casting blanks, pre-heating the casting blanks, heating the casting blanks, dephosphorizing, rolling, air cooling, carrying out flaw detection, shot blasting, quenching, tempering, straightening, cutting and sampling, spray printing logos, inspecting and storing, wherein
the thickness of the blanks is 320mm; at the time of heating the casting blanks, the temperature in the heating zone is 1,200°C-1,220°C, the temperature in the soaking zone is controlled at 1,215°C, the tapping temperature is 1,195°C, and the !0 time in furnace is 405min;
two-stage rolling is used during rolling; the initial rolling temperature at the second stage is 886°C, the thickness of the finished product is 90mm, the thickness of the temperature-holding casting blanks is controlled at 150mm, and the final rolling temperature at the second stage is 856°C, and it is cooled in the air after !5 rolling; rolling in the recrystallization zone requires a pass reduction rate of>12% and a final rolling temperature of>980°C, rolling in the recrystallization zone requires a cumulative reduction rate of >50%, and rolling in the non-recrystallization zone requires a cumulative reduction rate of>40%, the initial rolling temperature of <950°C and the final rolling temperature of >830°C; during quenching and tempering, the quenching temperature is controlled at 912 0C, the heating rate is 1.4min/mm, and the time in furnace is 185min; after quenching, the tempering temperature is controlled at 200 0 C, and the heating rate is 2.4min/mm, the time in furnace is 410min, and it is slowly cooled to room temperature; and at the time of hot-rolled straightening, pre-straightening is first performed at 828 0 C.
Embodiment 2
A large-thickness NM500 wear-resistant steel provided by the present embodiment, wherein it comprises the following chemical components by mass percentage: C: 0.28%, Si: 0.27%, Mn: 0.83%, P: <0.009%, S: <0.0020%, Cr:
0.79%, Ni: 0.49%, Mo: 0.43%, Ti: 0.015%, B: 0.0016%, Alt: 0.033%, Ceq:
0.70%, Ceq=C+Mn/6+(Cr+Mo+V)/5+(Cu+Ni)/15, and the balance is Fe and unavoidable impurities.
The production method comprises the following processes: carrying out desulfurization pretreatment on molten iron, smelting in a converter, refining LF and RH, continuously casting, stacking casting blanks for slow-cooling, inspecting the casting blanks, judging the casting blanks, checking the casting blanks, !0 pre-heating the casting blanks, heating the casting blanks, dephosphorizing, rolling, air cooling, carrying out flaw detection, shot blasting, quenching, tempering, straightening, cutting and sampling, spray printing logos, inspecting and storing, wherein
the thickness of the blanks is 320mm; at the time of heating the casting blanks, !5 the temperature in the heating zone is 1220°C-1,220 0 C, the temperature in the soaking zone is controlled at 1230 0 C, the tapping temperature is 11900 C, and the time in furnace is 373min; two-stage rolling is used during rolling; the initial rolling temperature at the second stage is 890°C, the thickness of the finished product is 90mm, the thickness of the temperature-holding casting blanks is controlled at 150mm, and the final rolling temperature at the second stage is 854°C, and it is cooled in the air after rolling; rolling in the recrystallization zone requires a pass reduction rate of>12% and a final rolling temperature of>980°C, rolling in the recrystallization zone requires a cumulative reduction rate of >50%, and rolling in the non-recrystallization zone requires a cumulative reduction rate of>40%, the initial rolling temperature of <950°C and the final rolling temperature of>830°C; during quenching and tempering, the quenching temperature is controlled at 910 0C, the heating rate is 1.5min/mm, and the time in furnace is 180min; after quenching, the tempering temperature is controlled at 180 0 C, and the heating rate is 2.5min/mm, the time in furnace is 400min, and it is slowly cooled to room temperature; and at the time of hot-rolled straightening, pre-straightening is first performed at 810 0 C.
Embodiment 3
A large-thickness NM500 wear-resistant steel provided by the present embodiment, wherein it comprises the following chemical components by mass !0 percentage: C: 0.28%, Si: 0.27%, Mn: 0.83%, P: <0.009%, S: <0.0020%, Cr:
0.78%, Ni: 0.47%, Mo: 0.42%, Ti: 0.014%, B: 0.0015%, Alt: 0.033%, Ceq:
0.70%, Ceq=C+Mn/6+(Cr+Mo+V)/5+(Cu+Ni)/15, and the balance is Fe and unavoidable impurities.
The production method comprises the following processes: carrying out !5 desulfurization pretreatment on molten iron, smelting in a converter, refining LF and RH, continuously casting, stacking casting blanks for slow-cooling, inspecting the casting blanks, judging the casting blanks, checking the casting blanks, pre-heating the casting blanks, heating the casting blanks, dephosphorizing, rolling, air cooling, carrying out flaw detection, shot blasting, quenching, tempering, straightening, cutting and sampling, spray printing logos, inspecting and storing, wherein the thickness of the blanks is 320mm; at the time of heating the casting blanks, the temperature in the heating zone is 1210°C-1,220°C, the temperature in the soaking zone is controlled at 1220°C, the tapping temperature is 1189°C, and the time in furnace is 378min; two-stage rolling is used during rolling; the initial rolling temperature at the second stage is 887°C, the thickness of the finished product is 90mm, the thickness of the temperature-holding casting blanks is controlled at 150mm, and the final rolling temperature at the second stage is 858°C, and it is cooled in the air after rolling; rolling in the recrystallization zone requires a pass reduction rate of>12% and a final rolling temperature of>980°C, rolling in the recrystallization zone requires a cumulative reduction rate of >50%, and rolling in the non-recrystallization zone requires a cumulative reduction rate of>40%, the initial rolling temperature of <950°C and the final rolling temperature of>830°C; during quenching and tempering, the quenching temperature is controlled at 910 0C, the heating rate is 1.5min/mm, and the time in furnace is 125min; after quenching, the tempering temperature is controlled at 180 0 C, and the heating rate !0 is 2.6min/mm, the time in furnace is 420min, and it is slowly cooled to room temperature; and at the time of hot-rolled straightening, pre-straightening is first performed at 825 0 C.
The mechanical properties of the wear-resistant steel produced in !5 Embodiment 1, Embodiment 2 and Embodiment 3 are shown in the table below:
Average Steel Surface Surface Core Core Impact energy impact value standardvalue/average standard plate hardnes requirem hardnes require impactvalue ss (HBW) ents ( ments (-40cAv) requirement ss (HBW) (HBW) (HBW) (HBW) (-40CAkv) s (-20°C, Akv) 90mm 532 >470 433 >360 36, 31, 41/36 >17
90mm 526 >470 399 >360 32, 29, 34/32 >17
90mm 501 >470 416 >360 28, 34, 31/31 >17
From Fig. 1 and Fig. 2, it can be seen that the microstructure is tempered
martensite from 1/4 to 1/2 thickness, and it is tempered martensite from 1/4
thickness to the core, and the grain structure is uniform.
The present invention develops a 90mm thick NM500 wear-resistant steel
through the component design of medium carbon and a small amount of chromium,
nickel, molybdenum alloy, niobium + vanadium + titanium + boron microalloying,
and a reasonable controlled rolling process and heat treatment process. After
controlled rolling and heat treatment, in terms of its mechanical properties, the
surface hardness is >470HB, the core hardness is >360HB, and Akv impact energy
value at -20°C is >17J. Since the national standard does not have mechanical
performance standards for 70mm thickness NM500 wear-resistant steel, the
hardness and toughness indicators obtained in the present invention have reached
the design standards for mechanical properties of large foreign companies. Due to
the high hardness and large thickness, it requires high cooling capacity of the
rolling equipment and the quenching machines in the actual industrial production
process. Meanwhile, the 5000 rolling mills for wide and thick plates are used, with
a rolling force of 12,000 tons, making full use of the rolling mode at high pressure
to obtain uniform grains and mechanical properties that match the structure and !0 performance. It successfully ensures that the production line with a rolling force
of 12,000 tons can produce high-hardness, high-toughness and large-thickness
wear-resistant steel, which is applied to large-scale domestic machinery and equipment, thereby greatly reducing the high cost due to relying on import. In addition to the above-described embodiments, the present invention may include other embodiments. Any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope of the present invention.
Claims (7)
1. A large-thickness NM500 wear-resistant steel, wherein it comprises the following chemical components by mass percentage: C: 0.26%-0.30%, Si: 0.20%-0.60%, Mn: 0.60%-1.00%, P: <0.012%, S: <0.003%, Cr: 0.60%-0.90%, Mo: 0.35%-0.50%, Ni: 0.40%-0.60%, Ti: 0.008%-0.030%, Nb: 0.015%-0.050%, B: 0.0008%-0.0025%, Ceq: <0.75%, Ceq=C+Mn/6+(Cr+Mo+V)/5+(Cu+Ni)/15 and the balance is Fe and unavoidable impurities.
2. The large-thickness NM500 wear-resistant steel according to claim 1, wherein it comprises the following chemical components by mass percentage: C: 0.27%,Si:0.28%,Mn:0.83%,P:<0.009%,S:<0.0015%, Cr:0.80%,Ni:0.48%, Mo: 0.45%, Ti: 0.013%, B: 0.0015%, Alt: 0.033% and Ceq: 0.69%.
3. The large-thickness NM500 wear-resistant steel according to claim 1, wherein it comprises the following chemical components by mass percentage: C: 0.28%, Si: 0.27%, Mn: 0.83%, P: <0.009%, S: <0.0020%, Cr: 0.79%, Ni: 0.49%, Mo: 0.43%, Ti: 0.015%, B: 0.0016%, Alt: 0.033% and Ceq: 0.70%.
4. The large-thickness NM500 wear-resistant steel according to claim 1, wherein it comprises the following chemical components by mass percentage: C: 0.28%, Si: 0.27%, Mn: 0.83%, P: <0.009%, S: <0.0020%, Cr: 0.78%, Ni: 0.47%, Mo: 0.42%, Ti: 0.014%, B: 0.0015%, Alt: 0.033% and Ceq: 0.70%.
5. A method for producing a large-thickness NM500 wear-resistant steel, wherein it comprises the following processes: carrying out desulfurization pretreatment on molten iron, smelting in a converter, refining LF and RH, continuously casting, stacking casting blanks for slow-cooling, inspecting the casting blanks, judging the casting blanks, checking the casting blanks, pre-heating the casting blanks, heating the casting blanks, dephosphorizing, rolling, air cooling, carrying out flaw detection, shot blasting, quenching, tempering, straightening, cutting and sampling, spray printing logos, inspecting and storing, wherein at the time of heating the casting blanks, the temperature in the heating zone is 1,180°C-1,230 0 C, the temperature in the soaking zone is controlled at 1,215°C-1,220C, the tapping temperature is 1,180°C-1,200C, and the time in furnace is 350min-420min; two-stage rolling method is adopted during rolling, the initial rolling temperature at the second stage is <950 0 C, the thickness of the finished product is mm, the thickness of the temperature-holding casting blanks is controlled at 130mm or more, and the final rolling temperature at the second stage is 850°C-860C, and it is cooled in the air after rolling; during quenching and tempering, the quenching temperature is controlled at 900°C-930C, the heating rate is 1.5±0.1min/mm, and the time in furnace is 170min-190min; after quenching, the tempering temperature is controlled at 150°C-220C, and the heating rate is 2.5 ±0.1min/mm, the time in furnace is 360min-450min, and it is slowly cooled to room temperature; and at the time of hot-rolled straightening, pre-straightening is first performed at 790°C-830 0 C.
6. The method for producing a large-thickness NM500 wear-resistant steel according to claim 5, wherein during rolling, rolling in the recrystallization zone requires a pass reduction rate of >12% and a final rolling temperature of>9800 C, rolling in the recrystallization zone requires a cumulative reduction rate of>50%, and rolling in the non-recrystallization zone requires a cumulative reduction rate of >40%, the initial rolling temperature of <950 0 C and the final rolling temperature of
>830 0 C.
7. The method for producing a large-thickness NM500 wear-resistant steel
according to claim 5, wherein the thickness of the blanks is 320 mm.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811342361.9 | 2018-11-12 | ||
| CN201811342361.9A CN109280852A (en) | 2018-11-12 | 2018-11-12 | A kind of big thickness NM500 abrasion-resistant stee and production method |
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| Publication Number | Publication Date |
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| AU2019101844A4 true AU2019101844A4 (en) | 2023-06-08 |
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| AU2019381094A Pending AU2019381094A1 (en) | 2018-11-12 | 2019-07-26 | Thick NM500 wear-resistant steel and production method therefor |
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| CN109280852A (en) * | 2018-11-12 | 2019-01-29 | 南京钢铁股份有限公司 | A kind of big thickness NM500 abrasion-resistant stee and production method |
| CN110343952A (en) * | 2019-07-02 | 2019-10-18 | 唐山中厚板材有限公司 | A kind of hardness is not less than the wear-resisting steel plate and its production method of 600HBW |
| CN110643883A (en) * | 2019-10-10 | 2020-01-03 | 南京钢铁股份有限公司 | Production method of one-steel multi-stage wear-resistant steel blank |
| CN111139349A (en) * | 2020-01-13 | 2020-05-12 | 河北普阳钢铁有限公司 | Method for improving heat treatment yield and quality of large-thickness wear-resistant steel plate |
| CN111020126A (en) * | 2020-01-13 | 2020-04-17 | 河北普阳钢铁有限公司 | Heat treatment method for wear-resistant steel middle plate with NM500 or above |
| CN112359284A (en) * | 2020-11-04 | 2021-02-12 | 南阳汉冶特钢有限公司 | High-strength low-temperature-toughness wear-resistant steel plate HY550NME and production method thereof |
| CN112553525B (en) * | 2020-11-17 | 2021-12-21 | 天津重型装备工程研究有限公司 | Medium-carbon low-alloy high-strength steel and preparation method thereof |
| CN112481546B (en) * | 2020-11-26 | 2022-06-14 | 南阳汉冶特钢有限公司 | Production method of steel plate P20 for extra-thick plastic mold |
| CN114164315B (en) * | 2021-11-12 | 2023-02-14 | 哈尔滨工程大学 | 1000 MPa-grade high-strength high-toughness easy-welding nano steel with thickness of 60-120 mm and preparation method thereof |
| CN115094217A (en) * | 2022-07-12 | 2022-09-23 | 南阳汉冶特钢有限公司 | 30CrMoA steel plate and production method thereof |
| CN115369303A (en) * | 2022-08-08 | 2022-11-22 | 包头钢铁（集团）有限责任公司 | Preparation method of wear-resistant steel NM500 |
| CN115449695B (en) * | 2022-08-22 | 2023-09-26 | 包头钢铁（集团）有限责任公司 | Production method of 1000 MPa-level high-strength round sucker rod steel |
| CN115491475B (en) * | 2022-10-12 | 2023-09-26 | 包头钢铁（集团）有限责任公司 | Preparation method of rare earth microalloyed low-cost high-hardness plastic die steel P20 |
| CN116288032B (en) * | 2023-03-29 | 2024-04-02 | 武汉科技大学 | Nb microalloying high-temperature-resistant and abrasion-resistant block multicomponent alloy and preparation method and application thereof |
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| JP2004300474A (en) * | 2003-03-28 | 2004-10-28 | Jfe Steel Kk | Abrasion resistant steel and manufacturing method therefor |
| CN101250673A (en) * | 2008-03-31 | 2008-08-27 | 武汉钢铁(集团)公司 | Ultrahigh strength abrasion resistant steel and method of preparing the same |
| CN101397632B (en) * | 2008-10-31 | 2010-12-22 | 郭玉宝 | Multielement low-alloy water quenching abrasion resistant steel |
| CN101638755A (en) * | 2009-08-21 | 2010-02-03 | 东北大学 | High-toughness and ultrahigh-strength wear-resistant steel plate and production method thereof |
| JP5966730B2 (en) * | 2012-07-30 | 2016-08-10 | Ｊｆｅスチール株式会社 | Abrasion resistant steel plate with excellent impact wear resistance and method for producing the same |
| CN105200337A (en) * | 2014-06-23 | 2015-12-30 | 鞍钢股份有限公司 | High-strength abrasion-resisting steel plate and production method thereof |
| CN104789881A (en) * | 2015-05-07 | 2015-07-22 | 湖南华菱湘潭钢铁有限公司 | Production method of wear-resistant steel plate having high strength and high toughness |
| CN105385951B (en) * | 2015-11-12 | 2017-10-13 | 内蒙古包钢钢联股份有限公司 | Have the production method of the NM500 wear-resisting steel plates of high hardness high toughness concurrently |
| JP6493285B2 (en) * | 2016-04-19 | 2019-04-03 | Ｊｆｅスチール株式会社 | Abrasion resistant steel sheet and method for producing the abrasion resistant steel sheet |
| CN109280852A (en) * | 2018-11-12 | 2019-01-29 | 南京钢铁股份有限公司 | A kind of big thickness NM500 abrasion-resistant stee and production method |
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| ZA202103239B (en) | 2023-05-31 |
| AU2019381094A1 (en) | 2021-05-27 |
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