CN114525450A - Wear-resistant steel and production method thereof - Google Patents

Wear-resistant steel and production method thereof Download PDF

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CN114525450A
CN114525450A CN202210117263.5A CN202210117263A CN114525450A CN 114525450 A CN114525450 A CN 114525450A CN 202210117263 A CN202210117263 A CN 202210117263A CN 114525450 A CN114525450 A CN 114525450A
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resistant steel
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翟冬雨
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Nanjing Iron and Steel Co Ltd
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Nanjing Iron and Steel Co Ltd
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Priority to PCT/CN2022/125395 priority patent/WO2023151301A1/en
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    • C—CHEMISTRY; METALLURGY
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    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
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    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
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    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
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    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
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    • 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
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    • 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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    • 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
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    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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    • 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 invention discloses wear-resistant steel and a production method thereof, relating to the technical field of steel production, and comprising the following chemical components in percentage by mass: c: 0.10-0.45%, Si: 0.20-0.55%, Mn: 0.50-1.50%, P is less than or equal to 0.015%, S is less than or equal to 0.003%, Nb: less than or equal to 0.060 percent, V less than or equal to 0.030 percent, Ti: 0.008-0.025%, Cr: 0.20-1.00%, Ni is less than or equal to 1.80%, Mo is less than or equal to 0.50%, Al: 0.025% -0.055%, B: 0.0010-0.0030%, Mg: 0.0010 to 0.0018 percent, less than or equal to 0.0045 percent of N and the balance of Fe and inevitable impurities. On the premise of ensuring the high-strength martensite structure of the wear-resistant steel plate, the quantity and the size of carbonitrides are reduced by the quantitative treatment of microalloying elements, the cooling speed and the austenite temperature of a casting blank are regulated and controlled, the structure crystal grains are refined by adopting the optimization process of secondary quenching, the structure stress is eliminated, and the problem that the wear-resistant steel delays cracks in the cutting and grinding processes of the casting blank and the steel plate is solved.

Description

Wear-resistant steel and production method thereof
Technical Field
The invention relates to the technical field of steel production, in particular to wear-resistant steel and a production method thereof.
Background
The wear-resistant steel is low-alloy high-strength martensitic steel, and the high-strength and high-toughness properties of the wear-resistant steel are widely used due to the low content of alloy elements. In order to achieve higher wear resistance, the later cutting process of the wear-resistant steel plate can adopt cutting methods such as laser cutting, plasma cutting and flame cutting, wherein the laser cutting and the plasma cutting have requirements on the thickness of the cut steel plate, so that certain limitations exist. Flame cutting is widely applied due to low cost, easy operation, high cutting efficiency and large thickness range of the steel plate which can be cut. The wear-resistant steel has high strength, the produced structure is martensite, delayed cracks are easy to generate after flame cutting, no warning sign is generated before the cracks are generated, sudden brittle fracture can be seriously caused, and great pressure is brought to production delivery.
Disclosure of Invention
Aiming at the technical problems, the invention overcomes the defects of the prior art and provides wear-resistant steel which comprises the following chemical components in percentage by mass: c: 0.10% -0.45%, Si: 0.20-0.55%, Mn: 0.50-1.50%, P is less than or equal to 0.015%, S is less than or equal to 0.003%, Nb: less than or equal to 0.060 percent, V less than or equal to 0.030 percent, Ti: 0.008-0.025%, Cr: 0.20-1.00%, Ni is less than or equal to 1.80%, Mo is less than or equal to 0.50%, Al: 0.025% -0.055%, B: 0.0010-0.0030%, Mg: 0.0010 to 0.0018 percent, less than or equal to 0.0045 percent of N and the balance of Fe and inevitable impurities.
The technical scheme of the invention is further defined as follows:
the wear-resistant steel comprises the following chemical components in percentage by mass: c: 0.15% -0.45%, Si: 0.25-0.55%, Mn: 0.55 to 1.50 percent of Ti, less than or equal to 0.015 percent of P, less than or equal to 0.003 percent of S, less than or equal to 0.060 percent of Nb, less than or equal to 0.030 percent of V, and the weight percentage of Ti: 0.010-0.020%, Cr: 0.30-1.00%, Ni is less than or equal to 1.80%, Mo is less than or equal to 0.50%, Al: 0.030% -0.055%, B: 0.0010-0.0020%, Mg: 0.0010 to 0.0018 percent, less than or equal to 0.0045 percent of N and the balance of Fe and inevitable impurities.
The wear-resistant steel comprises the following chemical components in percentage by mass: c: 0.10% -0.40%, Si: 0.20-0.40%, Mn: 0.60-1.20%, P is less than or equal to 0.015%, S is less than or equal to 0.003%, Nb: 0.030-0.060%, V is less than or equal to 0.030%, Ti: 0.012% -0.022%, Cr: 0.20-1.00%, Ni is less than or equal to 1.80%, Mo is less than or equal to 0.50%, Al: 0.040% -0.055%, B: 0.0010-0.0030%, Mg: 0.0010 to 0.0018 percent, less than or equal to 0.0045 percent of N and the balance of Fe and inevitable impurities.
The wear-resistant steel comprises the following chemical components in percentage by mass: c: 0.15% -0.35%, Si: 0.25-0.35%, Mn: 0.50-1.40%, P is less than or equal to 0.015%, S is less than or equal to 0.003%, Nb: 0.010-0.020%, V is less than or equal to 0.030%, Ti: 0.008% -0.015%, Cr: 0.30-0.60%, Ni is less than or equal to 1.80%, Mo is less than or equal to 0.50%, Al: 0.030-0.050%, B: 0.0010-0.0030%, Mg: 0.0010 to 0.0018 percent, less than or equal to 0.0045 percent of N and the balance of Fe and inevitable impurities.
The wear-resistant steel comprises the following chemical components in percentage by mass: c: 0.30% -0.45%, Si: 0.30-0.55%, Mn: 0.90-1.50%, P is less than or equal to 0.015%, S is less than or equal to 0.003%, Nb: 0.020-0.030 percent, V is less than or equal to 0.030 percent, Ti: 0.012% -0.022%, Cr: 0.60-1.00%, Ni is less than or equal to 1.80%, Mo: 0.30-0.50%, Al: 0.030-0.050%, B: 0.0010-0.0020%, Mg: 0.0010 to 0.0018 percent, less than or equal to 0.0045 percent of N and the balance of Fe and inevitable impurities.
The wear-resistant steel has a steel grade of 360-600 HBW and a thickness specification of 3-180 mm.
The invention also aims to provide a production method of the wear-resistant steel, which comprises the following steps:
s1, smelting the desulfurized molten iron in a smelting furnace, performing LF deoxidation alloying, and then conveying to RH vacuum treatment, wherein the vacuum degree is less than or equal to 3.0mbar, the vacuum treatment time is 15-25 min after the vacuum degree requirement is met, performing magnesium treatment on a magnesium-aluminum wire after the vacuum is finished, and statically stirring for 12-30 min after the magnesium treatment is finished;
s2, transferring the molten steel, and then conveying the molten steel to a continuous casting table for casting, wherein the superheat degree of a tundish is 15-30 ℃, the continuous casting drawing speed is 0.6-1.3 m/min, and full-protection casting is adopted to avoid secondary oxidation of the molten steel;
s3, keeping the temperature of the casting blank to be 150-450 ℃ after thermal detection, feeding the casting blank into a furnace, keeping the austenitizing temperature of the heating furnace to be 1200 +/-20 ℃, and rolling by adopting a TMCP (thermal mechanical control processing) rolling process;
s4, sending the rolled steel plate to heat treatment for quenching and tempering, setting the primary quenching temperature as 910-930 ℃, preserving heat for 30-50 min, and cooling with water; setting the secondary quenching temperature to be 860-880 ℃, preserving the heat for 25-30 min, and cooling by water; tempering and heating at 250-260 ℃, preserving heat for 50-60 min, and air cooling;
s5, heating the steel plate to 120-150 ℃ by using an electronic heating pad after tempering, discharging from the furnace, cutting by using a combustion gun, starting the cutting at the speed of 160-200 mm/min and cutting at the speed of 350-380 mm/min, covering a fireproof heat-insulating cotton after cutting, and slowly cooling to room temperature to eliminate stress generated by cutting;
and S6, marking, warehousing and shipping the divided steel plates according to the performance requirements.
The invention has the beneficial effects that:
(1) the magnesium metallurgy technology is adopted to replace the calcium treatment technology, the magnesium metallurgy technology is applied to high-carbon low-alloy martensitic steel for the first time, the effective refinement of the structure grain size is achieved, the simple magnesium aluminate spinel inclusion is generated to replace the calcium aluminate inclusion, and the purity of molten steel is effectively improved;
(2) the temperature-waiting coping technology and the hot charging technology avoid the occurrence probability of stress cracks during cold stacking, avoid the harm caused by phase change cracks and solve the stress defect of the blank;
(3) the content of N element in the composition design is less than or equal to 45ppm, and by reducing the content of N element in the steel plate, the precipitation of BN can be effectively controlled, the quenching effect of B element is ensured, and meanwhile, large-size (Ti, Nb) N-type inclusions can be prevented from being generated, and the induction of delayed cracks is avoided; the ratio of the Ti content to the N content is controlled to be 3.4-4.0, so that the Ti element can fully fix N, and large-size TiN inclusions can be prevented from being generated; adjusting the continuous casting drawing speed to ensure that the condensation rate is in the range of 4-10 ℃/s, and improving the size of the (Ti, Nb) N impurities; the heating temperature of the casting blank is 1200 +/-20 ℃, so that the diffusivity of the alloy elements can be increased, and the segregation zone generated by enrichment of the alloy elements can be effectively reduced;
(4) the secondary quenching is adopted, and the cutting process is optimally designed, so that the influence of components on the stress of the steel plate is avoided, and the occurrence of cutting cracks is avoided;
(5) the content of N element is less than or equal to 45ppm, which mainly avoids the formation of micron-sized (Ti, Nb) N inclusion induced delayed cracks by the combination of Ti, Nb and N in the steel;
the Ti element can refine crystal grains and can fully fix nitrogen, but excessive Ti can generate micron-sized Ti (N, C) inclusions, which are not beneficial to cleaning steel and easy to induce cracks, so the use amount of the titanium is controlled in a narrow range under the condition of controlling nitrogen, the ratio of the Ti content to the N content needs to be controlled to be less than or equal to 4.0, the cooling rate is controlled to prevent the inclusions with too slow cooling speed from growing, the bonding force of the Ti element and the N element is far higher than that of the B element, therefore, a proper amount of Ti element can be added into the steel to be combined with the N to form TiN precipitates, the N element is fixed, the B element is free, and the hardenability is improved;
the Nb element can be combined with the N element to form NbN precipitates to fix the N element, so that the B element is free but weaker than the Ti element, but when the use amount of the Nb element is increased, Ti can be reduced or not selected, only the Nb element with the content higher than the conventional content is added into the steel to fix the N element, and the number of the micron-sized carbonitrides with regular shapes can be effectively reduced;
the combined addition of Mo and Nb can increase the effectiveness of B element, so that Mo element with content higher than that of conventional Mo element and a proper amount of Nb element can be selectively added into steel to fix N element, so that B element is in a free state and plays the role of B element;
al also has a certain N fixation function, but Al is firstly combined with O in steel to generate Al2O3Therefore, the addition amount of the Al element shown in claim 3 can be increased to 0.040% -0.055%, the Al element left after deoxidation is used for fixing the N element, and the quenching effect of the B element is increased;
b element can increase hardenability of steel sheet, and B element is easily combined with N element existing in steel to form stable BN precipitate, resulting in decrease of content of free B element in austenite and reduction of hardenability, so B is required to be used in combination with Ti, Nb, Mo, Al.
Drawings
FIG. 1 is a metallographic structure diagram of example 1 of the present invention.
Detailed Description
Example 1
The wear-resistant steel provided by the embodiment comprises the following chemical components in percentage by mass: 0.23%, Si: 0.41%, Mn: 0.86%, P: 0.011%, S: 0.001%, Nb: 0.031%, V: 0.001%, Ti: 0.016%, Cr: 0.51%, Ni: 0.020%, Mo: 0.21%, Al: 0.041%, B: 0.0016%, Mg: 0.0015%, N: 0.0021%, and the balance of Fe and inevitable impurities.
The manufacturing method comprises the following steps:
s1, smelting the desulfurized molten iron in a smelting furnace, performing LF deoxidation alloying, and then conveying to RH vacuum treatment, wherein the vacuum degree is not more than 3.0mbar, the vacuum treatment time is 18min after the vacuum degree requirement is met, performing magnesium treatment on a magnesium-aluminum wire after the vacuum is finished, and statically stirring for 15min after the magnesium treatment is finished;
s2, transferring the molten steel, and then conveying the molten steel to a continuous casting table for casting, wherein the superheat degree of a tundish is 23 ℃, the continuous casting drawing speed is 0.9m/min, and the secondary oxidation of the molten steel is avoided by adopting full-protection casting;
s3, keeping the charging temperature at 310 ℃ after the casting blank is subjected to thermal detection, charging into the furnace, keeping the austenitizing temperature of the heating furnace at 1219 ℃, and rolling by adopting a TMCP (thermal mechanical control processing) rolling process;
s4, sending the rolled steel plate to a heat treatment for quenching and tempering, setting the primary quenching temperature to be 919 ℃, preserving the heat for 39min, and cooling by water; setting the secondary quenching temperature as 867 ℃, preserving the heat for 26min, and cooling by water; tempering and heating at 257 ℃, preserving heat for 58min, and air cooling;
s5, heating the tempered steel plate to 140 ℃ by using an electronic heating pad, discharging from the furnace, cutting by using a combustion gun at a cutting starting speed of 180mm/min and a cutting speed of 370mm/min, covering refractory heat-insulating cotton after cutting, and slowly cooling to room temperature to eliminate stress generated by cutting;
and S6, marking, warehousing and shipping the divided steel plates according to the performance requirements.
Example 2
The wear-resistant steel provided by the embodiment comprises the following chemical components in percentage by mass: c: 0.36%, Si: 0.29%, Mn: 0.76%, P: 0.010%, S: 0.001%, Nb: 0.051%, V: 0.001%, Ti: 0.021%, Cr: 0.65%, Ni: 0.002%, Mo: 0.13%, Al: 0.048%, B: 0.0019%, Mg: 0.0016%, N: 0.0041% and the balance of Fe and inevitable impurities.
The manufacturing method comprises the following steps:
s1, smelting the desulfurized molten iron in a smelting furnace, performing LF deoxidation alloying, and then conveying to RH vacuum treatment, wherein the vacuum degree is not more than 3.0mbar, the vacuum treatment time is 21min after the vacuum degree requirement is met, magnesium treatment is performed on a magnesium-aluminum wire after the vacuum is finished, and the magnesium treatment is statically stirred for 15min after the magnesium treatment is finished;
s2, transferring the molten steel, and then conveying the molten steel to a continuous casting table for casting, wherein the superheat degree of a tundish is 23 ℃, the continuous casting drawing speed is 1.0m/min, and the secondary oxidation of the molten steel is avoided by adopting full-protection casting;
s3, keeping the charging temperature of 180 ℃ after the casting blank is subjected to thermal detection, charging into the furnace, keeping the austenitizing temperature of the heating furnace to be 1209 ℃, and rolling by adopting a TMCP (thermal mechanical control processing) rolling process;
s4, sending the rolled steel plate to a heat treatment for quenching and tempering, setting the primary quenching temperature to be 917 ℃, preserving the heat for 37min, and cooling by water; setting the secondary quenching temperature as 870 ℃ of heating temperature, keeping the temperature for 28min, and cooling by water; tempering and heating at 253 ℃, preserving heat for 53min, and air cooling;
s5, heating the tempered steel plate to 140 ℃ by using an electronic heating pad, discharging from the furnace, cutting by using a combustion gun at a cutting starting speed of 180mm/min and a cutting speed of 370mm/min, covering refractory heat-insulating cotton after cutting, and slowly cooling to room temperature to eliminate stress generated by cutting;
and S6, marking, warehousing and shipping the divided steel plates according to the performance requirements.
Example 3
The wear-resistant steel provided by the embodiment comprises the following chemical components in percentage by mass: c: 0.19%, Si: 0.27%, Mn: 1.2%, P: 0.013%, S: 0.002%, Nb: 0.013%, V: 0.005%, Ti: 0.012%, Cr: 0.51%, Ni: 0.03%, Mo: 0.31%, Al: 0.039%, B: 0.0023%, Mg: 0.0017%, N: 0.0029%, and the balance of Fe and inevitable impurities.
The manufacturing method comprises the following steps:
s1, smelting the desulfurized molten iron in a smelting furnace, performing LF deoxidation alloying, and then conveying to RH vacuum treatment, wherein the vacuum degree is not more than 3.0mbar, the vacuum treatment time is 17min after the vacuum degree requirement is met, magnesium treatment is performed on a magnesium-aluminum wire after the vacuum is finished, and the magnesium treatment is performed for 16min after the magnesium treatment is finished;
s2, transferring the molten steel, and then conveying the molten steel to a continuous casting table for casting, wherein the superheat degree of a tundish is 19 ℃, the continuous casting drawing speed is 0.7m/min, and the secondary oxidation of the molten steel is avoided by adopting full-protection casting;
s3, keeping the charging temperature at 170 ℃ after the casting blank is subjected to thermal detection, charging into the furnace, keeping the austenitizing temperature of the heating furnace at 1215 ℃, and rolling by adopting a TMCP rolling process;
s4, sending the rolled steel plate to heat treatment for quenching and tempering, setting the primary quenching temperature to be 919 ℃, preserving heat for 43min, and cooling by water; setting the secondary quenching temperature to 877 ℃, keeping the temperature for 29min, and cooling by water; tempering and heating at 253 ℃, preserving the heat for 56min, and cooling in air;
s5, heating the tempered steel plate to 130 ℃ by using an electronic heating pad, discharging from the furnace, cutting by using a combustion gun, starting the cutting at the speed of 190mm/min and cutting at the speed of 360mm/min, covering refractory heat-insulating cotton after cutting, and slowly cooling to room temperature to eliminate stress generated by cutting;
and S6, marking, warehousing and shipping the divided steel plates according to the performance requirements.
Example 4
The wear-resistant steel provided by the embodiment comprises the following chemical components in percentage by mass: 0.41%, Si: 0.51%, Mn: 0.95%, P: 0.010%, S: 0.001%, Nb: 0.022%, V: 0.001%, Ti: 0.017%, Cr: 0.69%, Ni: 0.60%, Mo: 0.45%, Al: 0.050%, B: 0.0018%, Mg: 0.0016%, N: 0.0033%, and the balance of Fe and inevitable impurities.
The manufacturing method comprises the following steps:
s1, smelting the desulfurized molten iron in a smelting furnace, performing LF deoxidation alloying, and then conveying to RH vacuum treatment, wherein the vacuum degree is not more than 3.0mbar, the vacuum treatment time is 22min after the vacuum degree requirement is met, performing magnesium treatment on a magnesium-aluminum wire after the vacuum is finished, and statically stirring for 25min after the magnesium treatment is finished;
s2, transferring the molten steel, and then conveying the molten steel to a continuous casting table for casting, wherein the superheat degree of a tundish is 26 ℃, the continuous casting drawing speed is 0.6m/min, and the secondary oxidation of the molten steel is avoided by adopting full-protection casting;
s3, keeping the charging temperature at 380 ℃ after the casting blank is subjected to thermal detection, charging the casting blank into the furnace, keeping the austenitizing temperature 1217 ℃ of the heating furnace, and rolling by adopting a TMCP (thermal mechanical control processing) rolling process;
s4, sending the rolled steel plate to heat treatment for quenching and tempering, setting the primary quenching temperature to be 922 ℃, keeping the temperature for 37min, and cooling by water; setting the secondary quenching temperature to 868 ℃, keeping the temperature for 29min, and cooling by water; tempering and heating at 255 ℃, preserving heat for 55min, and air cooling;
s5, heating the tempered steel plate to 130 ℃ by using an electronic heating pad, discharging from the furnace, cutting by using a combustion gun, starting the cutting at the speed of 190mm/min and cutting at the speed of 370mm/min, covering refractory heat-insulating cotton after cutting, and slowly cooling to room temperature to eliminate stress generated by cutting; and S6, marking, warehousing and shipping the divided steel plates according to the performance requirements.
According to the characteristics of products, the composition design of the steel plate is deeply researched, the quantity and the size of carbonitrides are reduced through the quantitative treatment of microalloying elements on the premise of ensuring the high-strength martensite structure of the wear-resistant steel plate, the cooling speed and the austenite temperature of a casting blank are regulated and controlled, the structure crystal grains are refined by adopting the optimization process of secondary quenching, the structure stress is eliminated, and the problem that the wear-resistant steel delays cracks in the cutting and grinding processes of the casting blank and the steel plate is solved.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.

Claims (7)

1. A wear resistant steel characterized by: the chemical components and the mass percentage are as follows: c: 0.10% -0.45%, Si: 0.20-0.55%, Mn: 0.50-1.50%, P is less than or equal to 0.015%, S is less than or equal to 0.003%, Nb: less than or equal to 0.060 percent, V less than or equal to 0.030 percent, Ti: 0.008-0.025%, Cr: 0.20-1.00%, Ni is less than or equal to 1.80%, Mo is less than or equal to 0.50%, Al: 0.025% -0.055%, B: 0.0010-0.0030%, Mg: 0.0010 to 0.0018 percent, less than or equal to 0.0045 percent of N and the balance of Fe and inevitable impurities.
2. A wear resistant steel according to claim 1, characterized in that: the chemical components and the mass percentage are as follows: c: 0.15% -0.45%, Si: 0.25-0.55%, Mn: 0.55 to 1.50 percent of Ti, less than or equal to 0.015 percent of P, less than or equal to 0.003 percent of S, less than or equal to 0.060 percent of Nb, less than or equal to 0.030 percent of V, and the weight percentage of Ti: 0.010-0.020%, Cr: 0.30-1.00%, Ni is less than or equal to 1.80%, Mo is less than or equal to 0.50%, Al: 0.030% -0.055%, B: 0.0010-0.0020%, Mg: 0.0010 to 0.0018 percent, less than or equal to 0.0045 percent of N and the balance of Fe and inevitable impurities.
3. A wear resistant steel according to claim 1, characterized in that: the chemical components and mass percentage are as follows: c: 0.10% -0.40%, Si: 0.20-0.40%, Mn: 0.60-1.20%, P is less than or equal to 0.015%, S is less than or equal to 0.003%, Nb: 0.030-0.060%, V is less than or equal to 0.030%, Ti: 0.012% -0.022%, Cr: 0.20-1.00%, Ni is less than or equal to 1.80%, Mo is less than or equal to 0.50%, Al: 0.040% -0.055%, B: 0.0010-0.0030%, Mg: 0.0010 to 0.0018 percent, less than or equal to 0.0045 percent of N and the balance of Fe and inevitable impurities.
4. A wear resistant steel according to claim 1, characterized in that: the chemical components and the mass percentage are as follows: c: 0.15% -0.35%, Si: 0.25-0.35%, Mn: 0.50-1.40%, P is less than or equal to 0.015%, S is less than or equal to 0.003%, Nb: 0.010-0.020%, V is less than or equal to 0.030%, Ti: 0.008% -0.015%, Cr: 0.30-0.60%, Ni is less than or equal to 1.80%, Mo is less than or equal to 0.50%, Al: 0.030-0.050%, B: 0.0010-0.0030%, Mg: 0.0010 to 0.0018 percent, less than or equal to 0.0045 percent of N, and the balance of Fe and inevitable impurities.
5. A wear resistant steel according to claim 1, characterized in that: the chemical components and the mass percentage are as follows: c: 0.30% -0.45%, Si: 0.30-0.55%, Mn: 0.90-1.50%, P is less than or equal to 0.015%, S is less than or equal to 0.003%, Nb: 0.020-0.030 percent, V is less than or equal to 0.030 percent, Ti: 0.012% -0.022%, Cr: 0.60-1.00%, Ni is less than or equal to 1.80%, Mo: 0.30-0.50%, Al: 0.030-0.050%, B: 0.0010-0.0020%, Mg: 0.0010 to 0.0018 percent, less than or equal to 0.0045 percent of N and the balance of Fe and inevitable impurities.
6. A wear resistant steel according to claim 1, characterized in that: the steel grade is 360-600 HBW, and the thickness specification is 3-180 mm.
7. A production method of wear-resistant steel is characterized by comprising the following steps: application to any of claims 1-6, comprising the steps of:
s1, smelting the desulfurized molten iron in a smelting furnace, performing LF deoxidation alloying, and then conveying to RH vacuum treatment, wherein the vacuum degree is less than or equal to 3.0mbar, the vacuum treatment time is 15-25 min after the vacuum degree requirement is met, performing magnesium treatment on a magnesium-aluminum wire after the vacuum is finished, and statically stirring for 12-30 min after the magnesium treatment is finished;
s2, transferring the molten steel, and then conveying the molten steel to a continuous casting table for casting, wherein the superheat degree of a tundish is 15-30 ℃, the continuous casting drawing speed is 0.6-1.3 m/min, and full-protection casting is adopted to avoid secondary oxidation of the molten steel;
s3, keeping the temperature of the casting blank to be 150-450 ℃ after thermal detection, feeding the casting blank into a furnace, keeping the austenitizing temperature of the heating furnace to be 1200 +/-20 ℃, and rolling by adopting a TMCP (thermal mechanical control processing) rolling process;
s4, sending the rolled steel plate to heat treatment for quenching and tempering, setting the primary quenching temperature as 910-930 ℃, preserving heat for 30-50 min, and cooling with water; setting the secondary quenching temperature to be 860-880 ℃, preserving the heat for 25-30 min, and cooling by water; tempering and heating at 250-260 ℃, preserving heat for 50-60 min, and air cooling;
s5, heating the steel plate to 120-150 ℃ by using an electronic heating pad after tempering, discharging from the furnace, cutting by using a combustion gun, starting the cutting at the speed of 160-200 mm/min and cutting at the speed of 350-380 mm/min, covering a fireproof heat-insulating cotton after cutting, and slowly cooling to room temperature to eliminate stress generated by cutting;
and S6, marking, warehousing and shipping the divided steel plates according to the performance requirements.
CN202210117263.5A 2022-02-08 2022-02-08 Wear-resistant steel and production method thereof Pending CN114525450A (en)

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