CN110964985A - Molybdenum-free low-alloy wear-resistant steel plate and production method thereof - Google Patents
Molybdenum-free low-alloy wear-resistant steel plate and production method thereof Download PDFInfo
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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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
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- 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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- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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Abstract
The invention discloses a molybdenum-free low-alloy wear-resistant steel plate and a production method thereof, wherein the wear-resistant steel plate comprises the following chemical components in percentage by mass: c: 0.11 to 0.15%, Si: 0.10 to 0.19%, Mn: 0.70-1.15%, P is less than or equal to 0.020%, S is less than or equal to 0.010%, Al: 0.012-0.042%, Cr: 0.25 to 0.45%, Ti: 0.010-0.035%, Nb: 0.018-0.035%, and the balance of Fe and inevitable impurities; the production method comprises the working procedures of molten iron pretreatment, converter smelting, LF refining, RH vacuum treatment, continuous casting, heating, rolling, air cooling, off-line quenching and low-temperature tempering. The wear-resistant steel plate has higher strength and good toughness, and is widely applied to mechanical products with severe working conditions, such as engineering, mining, construction, agriculture, cement production, ports, electric power, pavement construction, metallurgy and the like.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a molybdenum-free low-alloy wear-resistant steel plate and a production method thereof.
Background
The low-alloy wear-resistant steel plate is a micro-alloyed steel plate with high wear resistance and high cost performance and special purpose, and belongs to a representative resource-saving material. Compared with wear-resistant materials such as high manganese steel, wear-resistant cast iron and the like, the wear-resistant steel has more excellent obdurability and wear resistance and lower cost, and is widely applied to mechanical products such as engineering, mining, construction, agriculture, cement production, ports, electric power, pavement construction, metallurgy and the like with particularly severe working conditions.
The production of wear-resistant steel in China starts late, at present, the precious metal Mo element is commonly added to the wear-resistant steel in domestic steel mills, the strength and hardness of low-alloy wear-resistant steel are increased, and the alloy cost of the wear-resistant steel is higher: the Chinese patent ZL201610540258.X discloses a low-alloy high-strength wear-resistant steel plate and a production method thereof, and the steel plate comprises the following chemical components in percentage by mass: c: 0.18 to 0.24%, Si: 0.30-0.80%, Mn: 1.40-1.60%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, Cr: 0.60-0.85%, Mo: 0.20-0.60%, Ni: 0.30-0.50%, V: 0.035-0.060%, Nb: 0.025-0.040%, B: 0.0020-0.0030%, Al: 0.020-0.050%, less than or equal to 0.0015% of O, and the balance of Fe and other inevitable impurities. The alloy contains Mo, Ni and the like, and the cost of the alloy is high.
The invention patent ZL201710204564.0 discloses a manufacturing method of thin high-Ti wear-resistant steel NM360, which comprises the following chemical components in percentage by mass: c: 0.16-0.20%, Si: 0.2-0.4%, Mn: 0.8-1.5%, Mo: 0.10-0.20%, Cr: 0.30 to 0.50%, Nb: 0.02-0.05%, Ti: 0.10-0.15%, B: 0.0005-0.0010%, P < 0.015%, S < 0.010%, and the balance Fe and inevitable impurities. The alloy still uses more Mo alloy elements and has higher cost.
The invention patent 201810007979.3 discloses a wear-resistant steel and a preparation method thereof, wherein the wear-resistant steel comprises the following chemical components in percentage by mass: c: 0.40 to 0.46%, Si: 0.30 to 0.50%, Mn: 1.8-2.4%, Cr: 0.9-1.4%, N i: 0.3-0.5%, Mo: 0.2-0.3%, Al: 0.1-0.2%, Nb: 0.01-0.02%, B: 0.03-0.05%, Cu: 0.01-0.03%, N: 0.07-0.15%, and the balance of Fe and inevitable impurities. Mo and Ni are still indispensable alloy elements, and the cost is high.
The invention patent ZL201780000191.3 discloses a thin-specification wear-resistant steel plate and a manufacturing method thereof, and the thin-specification wear-resistant steel plate comprises the following chemical components in percentage by mass: c: 0.15 to 0.20%, Si: 0.2-0.4%, Mn: 1.2-1.8%, Cu: 0.1-0.40%, Mo: 0.15-0.30%, Cr: 0.20 to 0.40%, Nb: 0.03-0.06%, Ti: 0.01-0.03%, B: 0.0006-0.0015%, P less than 0.015%, S less than 0.010%, and the balance of Fe and inevitable impurities. A certain amount of Mo alloy element is still added, and the production cost is higher.
At present, most of domestic wear-resistant steel is added with a noble metal element Mo to improve the hardness, and the production cost is relatively high. Vanadium is also adopted for strengthening, and vanadium is mainly precipitated and strengthened, so that the precipitation and strengthening are unfavorable for the toughness of steel.
In conclusion, the molybdenum-free low-alloy wear-resistant steel plate is developed, so that the wear-resistant steel plate has good toughness and welding performance, the market competitiveness is improved, and the molybdenum-free low-alloy wear-resistant steel plate has important significance.
Disclosure of Invention
The invention aims to solve the technical problem of providing a molybdenum-free low-alloy wear-resistant steel plate and a production method thereof. The wear-resistant steel plate has good toughness and welding performance, and the thickness of the steel plate is 8-50 mm.
In order to solve the technical problems, the invention adopts the technical scheme that: the molybdenum-free low-alloy wear-resistant steel plate comprises the following chemical components in percentage by mass: c: 0.11 to 0.15%, Si: 0.10 to 0.19%, Mn: 0.70-1.15%, P is less than or equal to 0.020%, S is less than or equal to 0.010%, Al: 0.012-0.042%, Cr: 0.25 to 0.45%, Ti: 0.010-0.035%, Nb: 0.018-0.035%, and the balance of Fe and inevitable impurities.
The invention has the following chemical component design ideas:
the components of the invention are designed to be reinforced by niobium instead of vanadium, the price of vanadium iron in China rises and fluctuates greatly, the reinforcing effect of niobium is greatly higher than that of vanadium, the adding amount of niobium is 1/3-1/2 of vanadium, and niobium has cost advantage. In addition, compared with vanadium, niobium has the functions of obviously inhibiting austenite recrystallization and grain growth, finer ferrite grains can be obtained after phase transformation, the toughness of steel can be improved while the strength is improved, and vanadium is mainly precipitated and strengthened, so that the precipitation and strengthening are unfavorable for the toughness of the steel.
The thickness of the molybdenum-free low-alloy wear-resistant steel plate is 8-50 mm.
The surface Brinell hardness of the molybdenum-free low-alloy wear-resistant steel plate is 330-390 HB, the tensile strength is more than or equal to 1100MPa, the elongation A50 after fracture is more than or equal to 12%, and the carbon equivalent is 0.27-0.43.
The invention also provides a production method of the molybdenum-free low-alloy wear-resistant steel plate, which comprises the working procedures of molten iron pretreatment, converter smelting, LF refining, RH vacuum treatment, continuous casting, heating, rolling, air cooling, off-line quenching and low-temperature tempering; in the off-line quenching process, the quenching heating temperature is 890-950 ℃; in the low-temperature tempering process, the low-temperature tempering heating temperature is 200-300 ℃.
In the continuous casting process, the thickness of the continuous casting billet is 280 mm.
In the heating process, in the continuous casting billet heating stage, the temperature of the soaking section is 1220-1240 ℃, preferably 1225-1240 ℃, and the heating coefficient is 8-11 min/cm, preferably 8.5-10 min/cm.
In the rolling procedure, the initial rolling temperature of rough rolling is 1050-1150 ℃, preferably 1060-1100 ℃, the single-pass reduction rate of rough rolling is more than or equal to 18%, and the final pass reduction rate is more than or equal to 25% in the rough rolling stage, so that crystal grains are distributed more uniformly, static recrystallization is sufficient, the thickness of a rough-rolled intermediate blank is 2.5-3 h, and h is the thickness of a finished steel plate; the finish rolling temperature is 830-870 ℃, and preferably 840-860 ℃.
In the air cooling process, air cooling is carried out to room temperature after rolling.
In the off-line quenching process, the quenching heating temperature is preferably 895-940 ℃.
In the low-temperature tempering process, the low-temperature tempering heating temperature is preferably 210-280 ℃.
The production method of the invention has the design idea that:
in the steelmaking process, molten iron pretreatment is adopted, so that certain harmful components are removed or beneficial components are recycled before the molten iron enters a converter for steelmaking. Aiming at steel making, the contents of silicon, sulfur and phosphorus in molten iron are mainly reduced to the required range, so that the steel making process is simplified, and the quality of steel is improved.
The steel rolling process adopts air cooling after rolling, and the plate shape and the tissue uniformity of the steel plate are ensured.
The heat treatment process adopts the off-line quenching and low-temperature tempering processes, but does not adopt the on-line quenching and off-line tempering processes, so that the final performance index of the wear-resisting plate is ensured. The high-strength plate produced by on-line quenching is easy to cause that the plate shape is improper after the steel plate is cooled, and after the steel plate is subjected to ultra-fast cooling, the integral temperature of the steel plate is uneven, the core temperature is too high, the steel plate cannot be transformed into a bainite or martensite structure, and the performance uniformity cannot be ensured. 63
The molybdenum-free low-alloy wear-resistant steel plate product is referred to GB/T24186-2009; the product performance detection method is in standard reference GB/T231.1 and GB/T228.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: 1. the wear-resistant steel disclosed by the invention does not contain precious alloy elements such as Mo, Ni and V in component design, and is low in cost. 2. The wear-resistant steel has the advantages that the Nb and Ti designed by the components of the wear-resistant steel have the effects of obviously inhibiting austenite recrystallization and grain growth, finer ferrite grains can be obtained after phase transformation, the strength is improved, and the toughness of the steel can be improved. 3. The wear-resistant steel has the advantages that the hardness is ensured, the carbon equivalent ratio is lower and is 0.27-0.43, and the welding performance of the steel plate is excellent. 4. The wear-resistant steel plate has the surface Brinell hardness of 330-390 HB, the tensile strength of more than or equal to 1100MPa and the elongation A50 after fracture of more than or equal to 12 percent, has higher strength and good toughness as a whole, is widely applied to mechanical products with particularly severe working conditions, such as engineering, mining, construction, agriculture, cement production, harbors, electric power, pavement construction, metallurgy and the like, and has wide application prospect.
Drawings
FIG. 1 is a microstructure of a molybdenum-free low-alloy wear-resistant steel plate according to example 1;
FIG. 2 is a microstructure of a molybdenum-free low-alloy wear-resistant steel plate according to example 2;
FIG. 3 is a microstructure of a low-alloy wear-resistant steel plate without molybdenum according to example 3;
FIG. 4 is a microstructure of a low-alloy wear-resistant steel plate without molybdenum according to example 4;
FIG. 5 is a microstructure of a low-alloy wear-resistant steel plate without molybdenum according to example 5;
FIG. 6 is a microstructure of a low-alloy wear-resistant steel plate without molybdenum according to example 6;
FIG. 7 is a microstructure of a low-alloy wear-resistant steel plate without molybdenum according to example 7;
FIG. 8 is a microstructure of the low-alloy wear-resistant steel plate without molybdenum in example 8.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Example 1
The thickness of the molybdenum-free low-alloy wear-resistant steel plate is 10mm, and the chemical composition and the mass percentage of the molybdenum-free low-alloy wear-resistant steel plate are shown in table 1.
The production method of the molybdenum-free low-alloy wear-resistant steel plate comprises the working procedures of molten iron pretreatment, converter smelting, LF refining, RH vacuum treatment, continuous casting, heating, rolling, air cooling, off-line quenching and low-temperature tempering, and comprises the following specific process steps:
(1) and (3) continuous casting process: molten steel is pretreated by molten iron, smelted by a converter, refined by LF and treated by RH vacuum,
continuously casting to obtain a casting blank with the blank thickness of 280 mm;
(2) a heating procedure: in the continuous casting billet heating stage, the temperature of the soaking section is 1230 ℃, and the heating coefficient is 9.5 min/cm;
(3) a rolling procedure: the rough rolling starting temperature is 1081 ℃, the rough rolling single-pass reduction rate is 20%, the final pass reduction rate in the rough rolling stage is 27%, and the thickness of the rough rolling intermediate blank is 28 mm; the finish rolling temperature is 842 ℃;
(4) an air cooling process: air cooling to room temperature after rolling;
(5) an off-line quenching procedure: the quenching heating temperature is 900 ℃;
(6) a low-temperature tempering process: the low-temperature tempering heating temperature is 270 ℃.
The mechanical properties of the molybdenum-free low-alloy wear-resistant steel plate in the embodiment are shown in table 2; the microstructure of the molybdenum-free low-alloy wear-resistant steel plate is shown in figure 1.
Example 2
The thickness of the molybdenum-free low-alloy wear-resistant steel plate is 50mm, and the chemical composition and the mass percentage of the molybdenum-free low-alloy wear-resistant steel plate are shown in table 1.
The production method of the molybdenum-free low-alloy wear-resistant steel plate comprises the working procedures of molten iron pretreatment, converter smelting, LF refining, RH vacuum treatment, continuous casting, heating, rolling, air cooling, off-line quenching and low-temperature tempering, and comprises the following specific process steps:
(1) and (3) continuous casting process: molten steel is pretreated by molten iron, smelted by a converter, refined by LF and treated by RH vacuum,
continuously casting to obtain a casting blank with the blank thickness of 280 mm;
(2) a heating procedure: in the continuous casting billet heating stage, the temperature of the soaking section is 1237 ℃, and the heating coefficient is 9.0 min/cm;
(3) a rolling procedure: the initial rolling temperature of rough rolling is 1071 ℃, the reduction rate of a single pass of rough rolling is 23%, the reduction rate of the last pass of the rough rolling stage is 26%, and the thickness of a rough rolling intermediate blank is 135 mm; the finish rolling temperature is 844 ℃;
(4) an air cooling process: air cooling to room temperature after rolling;
(5) an off-line quenching procedure: the quenching heating temperature is 940 ℃;
(6) a low-temperature tempering process: the low-temperature tempering heating temperature is 250 ℃.
The mechanical properties of the molybdenum-free low-alloy wear-resistant steel plate in the embodiment are shown in table 2; the microstructure of the molybdenum-free low-alloy wear-resistant steel plate is shown in figure 2.
Example 3
The thickness of the molybdenum-free low-alloy wear-resistant steel plate is 20mm, and the chemical composition and the mass percentage of the molybdenum-free low-alloy wear-resistant steel plate are shown in table 1.
The production method of the molybdenum-free low-alloy wear-resistant steel plate comprises the working procedures of molten iron pretreatment, converter smelting, LF refining, RH vacuum treatment, continuous casting, heating, rolling, air cooling, off-line quenching and low-temperature tempering, and comprises the following specific process steps:
(1) and (3) continuous casting process: molten steel is pretreated by molten iron, smelted by a converter, refined by LF and treated by RH vacuum,
continuously casting to obtain a casting blank with the blank thickness of 280 mm;
(2) a heating procedure: in the continuous casting billet heating stage, the temperature of the soaking section is 1225 ℃, and the heating coefficient is 10 min/cm;
(3) a rolling procedure: the initial rolling temperature of rough rolling is 1060 ℃, the reduction rate of a single pass of rough rolling is 21%, the reduction rate of the last pass of the rough rolling stage is 28%, and the thickness of a rough rolling intermediate blank is 58 mm; the finish rolling temperature of the finish rolling is 860 ℃;
(4) an air cooling process: air cooling to room temperature after rolling;
(5) an off-line quenching procedure: the quenching heating temperature is 895 ℃;
(6) a low-temperature tempering process: the low-temperature tempering heating temperature is 280 ℃.
The mechanical properties of the molybdenum-free low-alloy wear-resistant steel plate in the embodiment are shown in table 2; the microstructure of the molybdenum-free low-alloy wear-resistant steel plate is shown in figure 3.
Example 4
The thickness of the molybdenum-free low-alloy wear-resistant steel plate is 30mm, and the chemical composition and the mass percentage of the molybdenum-free low-alloy wear-resistant steel plate are shown in table 1.
The production method of the molybdenum-free low-alloy wear-resistant steel plate comprises the working procedures of molten iron pretreatment, converter smelting, LF refining, RH vacuum treatment, continuous casting, heating, rolling, air cooling, off-line quenching and low-temperature tempering, and comprises the following specific process steps:
(1) and (3) continuous casting process: molten steel is pretreated by molten iron, smelted by a converter, refined by LF and treated by RH vacuum,
continuously casting to obtain a casting blank with the blank thickness of 280 mm;
(2) a heating procedure: in the continuous casting billet heating stage, the temperature of the soaking section is 1240 ℃, and the heating coefficient is 8.5 min/cm;
(3) a rolling procedure: the initial rolling temperature of rough rolling is 1100 ℃, the reduction rate of a single pass of rough rolling is 22%, the reduction rate of the last pass of the rough rolling stage is 29%, and the thickness of a rough rolling intermediate blank is 78 mm; the finish rolling temperature is 840 ℃;
(4) an air cooling process: air cooling to room temperature after rolling;
(5) an off-line quenching procedure: the quenching heating temperature is 940 ℃;
(6) a low-temperature tempering process: the low-temperature tempering heating temperature is 210 ℃.
The mechanical properties of the molybdenum-free low-alloy wear-resistant steel plate in the embodiment are shown in table 2; the microstructure of the molybdenum-free low-alloy wear-resistant steel plate is shown in figure 4.
Example 5
The thickness of the molybdenum-free low-alloy wear-resistant steel plate is 40mm, and the chemical composition and the mass percentage of the molybdenum-free low-alloy wear-resistant steel plate are shown in table 1.
The production method of the molybdenum-free low-alloy wear-resistant steel plate comprises the working procedures of molten iron pretreatment, converter smelting, LF refining, RH vacuum treatment, continuous casting, heating, rolling, air cooling, off-line quenching and low-temperature tempering, and comprises the following specific process steps:
(1) and (3) continuous casting process: molten steel is pretreated by molten iron, smelted by a converter, refined by LF and treated by RH vacuum,
continuously casting to obtain a casting blank with the blank thickness of 280 mm;
(2) a heating procedure: in the continuous casting billet heating stage, the temperature of the soaking section is 1235 ℃, and the heating coefficient is 8.8 min/cm;
(3) a rolling procedure: the initial rolling temperature of rough rolling is 1080 ℃, the reduction rate of a single pass of rough rolling is 19%, the reduction rate of the last pass of the rough rolling stage is 30%, and the thickness of a rough rolling intermediate blank is 108 mm; the temperature of finish rolling is 855 ℃;
(4) an air cooling process: air cooling to room temperature after rolling;
(5) an off-line quenching procedure: the quenching heating temperature is 920 ℃;
(6) a low-temperature tempering process: the low-temperature tempering heating temperature is 240 ℃.
The mechanical properties of the molybdenum-free low-alloy wear-resistant steel plate in the embodiment are shown in table 2; the microstructure of the molybdenum-free low-alloy wear-resistant steel plate is shown in figure 5.
Example 6
The thickness of the molybdenum-free low-alloy wear-resistant steel plate is 25mm, and the chemical composition and the mass percentage of the molybdenum-free low-alloy wear-resistant steel plate are shown in table 1.
The production method of the molybdenum-free low-alloy wear-resistant steel plate comprises the working procedures of molten iron pretreatment, converter smelting, LF refining, RH vacuum treatment, continuous casting, heating, rolling, air cooling, off-line quenching and low-temperature tempering, and comprises the following specific process steps:
(1) and (3) continuous casting process: molten steel is pretreated by molten iron, smelted by a converter, refined by LF and treated by RH vacuum,
continuously casting to obtain a casting blank with the blank thickness of 280 mm;
(2) a heating procedure: in the continuous casting billet heating stage, the temperature of the soaking section is 1228 ℃, and the heating coefficient is 9.7 min/cm;
(3) a rolling procedure: the initial rolling temperature of rough rolling is 1090 ℃, the reduction rate of a single pass of rough rolling is 24%, the reduction rate of the last pass of the rough rolling stage is 30%, and the thickness of a rough rolling intermediate blank is 75 mm; the finish rolling temperature is 843 ℃;
(4) an air cooling process: air cooling to room temperature after rolling;
(5) an off-line quenching procedure: the quenching heating temperature is 915 ℃;
(6) a low-temperature tempering process: the low-temperature tempering heating temperature is 220 ℃.
The mechanical properties of the molybdenum-free low-alloy wear-resistant steel plate in the embodiment are shown in table 2; the microstructure of the molybdenum-free low-alloy wear-resistant steel plate is shown in figure 6.
Example 7
The thickness of the molybdenum-free low-alloy wear-resistant steel plate is 45mm, and the chemical composition and the mass percentage of the molybdenum-free low-alloy wear-resistant steel plate are shown in table 1.
The production method of the molybdenum-free low-alloy wear-resistant steel plate comprises the working procedures of molten iron pretreatment, converter smelting, LF refining, RH vacuum treatment, continuous casting, heating, rolling, air cooling, off-line quenching and low-temperature tempering, and comprises the following specific process steps:
(1) and (3) continuous casting process: molten steel is pretreated by molten iron, smelted by a converter, refined by LF and treated by RH vacuum,
continuously casting to obtain a casting blank with the blank thickness of 280 mm;
(2) a heating procedure: in the continuous casting billet heating stage, the temperature of the soaking section is 1220 ℃, and the heating coefficient is 11 min/cm;
(3) a rolling procedure: the initial rolling temperature of rough rolling is 1150 ℃, the single-pass reduction rate of rough rolling is 18%, the final-pass reduction rate of the rough rolling stage is 25%, and the thickness of the rough rolling intermediate blank is 135 mm; the finish rolling temperature is 830 ℃;
(4) an air cooling process: air cooling to room temperature after rolling;
(5) an off-line quenching procedure: the quenching heating temperature is 950 ℃;
(6) a low-temperature tempering process: the low-temperature tempering heating temperature is 200 ℃.
The mechanical properties of the molybdenum-free low-alloy wear-resistant steel plate in the embodiment are shown in table 2; the microstructure of the molybdenum-free low-alloy wear-resistant steel plate is shown in figure 7.
Example 8
The thickness of the molybdenum-free low-alloy wear-resistant steel plate is 8mm, and the chemical composition and the mass percentage of the molybdenum-free low-alloy wear-resistant steel plate are shown in table 1.
The production method of the molybdenum-free low-alloy wear-resistant steel plate comprises the working procedures of molten iron pretreatment, converter smelting, LF refining, RH vacuum treatment, continuous casting, heating, rolling, air cooling, off-line quenching and low-temperature tempering, and comprises the following specific process steps:
(1) and (3) continuous casting process: molten steel is pretreated by molten iron, smelted by a converter, refined by LF and treated by RH vacuum,
continuously casting to obtain a casting blank with the blank thickness of 280 mm;
(2) a heating procedure: in the continuous casting billet heating stage, the temperature of the soaking section is 1240 ℃, and the heating coefficient is 8 min/cm;
(3) a rolling procedure: the initial rolling temperature of rough rolling is 1050 ℃, the single-pass reduction rate of rough rolling is 22%, the final pass reduction rate of the rough rolling stage is 26%, and the thickness of the rough rolling intermediate blank is 20 mm; the finish rolling temperature is 870 ℃;
(4) an air cooling process: air cooling to room temperature after rolling;
(5) an off-line quenching procedure: the quenching heating temperature is 890 ℃;
(6) a low-temperature tempering process: the low-temperature tempering heating temperature is 300 ℃.
The mechanical properties of the molybdenum-free low-alloy wear-resistant steel plate in the embodiment are shown in table 2; the microstructure of the molybdenum-free low-alloy wear-resistant steel plate is shown in figure 8.
Table 1 examples 1-8 chemical composition and mass% of the molybdenum-free low-alloy wear-resistant steel sheet
The balance of the ingredients in table 1 is Fe and unavoidable impurities.
TABLE 2 mechanical Properties of examples 1-8 Mo-free Low-alloy wear-resistant Steel plates
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
Claims (8)
1. The molybdenum-free low-alloy wear-resistant steel plate is characterized by comprising the following chemical components in percentage by mass: c: 0.11 to 0.15%, Si: 0.10 to 0.19%, Mn: 0.70-1.15%, P is less than or equal to 0.020%, S is less than or equal to 0.010%, Al: 0.012-0.042%, Cr: 0.25 to 0.45%, Ti: 0.010-0.035%, Nb: 0.018-0.035%, and the balance of Fe and inevitable impurities.
2. The molybdenum-free low-alloy wear-resistant steel plate as claimed in claim 1, wherein the thickness of the molybdenum-free low-alloy wear-resistant steel plate is 8-50 mm.
3. The molybdenum-free low-alloy wear-resistant steel plate as claimed in claim 1, wherein the surface Brinell hardness of the molybdenum-free low-alloy wear-resistant steel plate is 330-390 HB, the tensile strength is not less than 1100MPa, the elongation after fracture A50 is not less than 12%, and the carbon equivalent is 0.27-0.43.
4. The method for producing the molybdenum-free low-alloy wear-resistant steel plate as claimed in any one of claims 1 to 3, wherein the production method comprises the working procedures of molten iron pretreatment, converter smelting, LF refining, RH vacuum treatment, continuous casting, heating, rolling, air cooling, off-line quenching and low-temperature tempering; in the off-line quenching process, the quenching heating temperature is 890-950 ℃; in the low-temperature tempering process, the low-temperature tempering heating temperature is 200-300 ℃.
5. The method for producing the molybdenum-free low-alloy wear-resistant steel plate as claimed in claim 4, wherein the continuous casting process is performed, and the thickness of the continuous casting billet is 280 mm.
6. The method for producing the molybdenum-free low-alloy wear-resistant steel plate as claimed in claim 4, wherein in the heating process, in the continuous casting billet heating stage, the temperature of a soaking section is 1220-1240 ℃, and the heating coefficient is 8-11 min/cm.
7. The production method of the molybdenum-free low-alloy wear-resistant steel plate as claimed in any one of claims 4 to 6, wherein in the rolling process, the initial rolling temperature of rough rolling is 1050-1150 ℃, the reduction rate of a single pass of rough rolling is more than or equal to 18%, and the reduction rate of the last pass of the rough rolling stage is more than or equal to 25%, the thickness of the rough-rolled intermediate blank is 2.5-3 h, and h is the thickness of a finished steel plate; and the finish rolling temperature is 830-870 ℃.
8. The method for producing a molybdenum-free low-alloy wear-resistant steel plate as claimed in any one of claims 4 to 6, wherein the air cooling step is air-cooled to room temperature after rolling.
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