CN113637894A - Leveling-free and tempering-free HB 450-grade wear-resistant steel and production method thereof - Google Patents
Leveling-free and tempering-free HB 450-grade wear-resistant steel and production method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 70
- 239000010959 steel Substances 0.000 title claims abstract description 70
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 238000005096 rolling process Methods 0.000 claims abstract description 45
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 27
- 238000001816 cooling Methods 0.000 claims abstract description 19
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- 239000000126 substance Substances 0.000 claims abstract description 11
- 229910052742 iron Inorganic materials 0.000 claims abstract description 10
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 9
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- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 9
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 8
- 239000012535 impurity Substances 0.000 claims abstract description 7
- 238000005520 cutting process Methods 0.000 claims abstract description 6
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 6
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- 238000007670 refining Methods 0.000 claims abstract description 5
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 5
- 238000003723 Smelting Methods 0.000 claims abstract description 4
- 238000009749 continuous casting Methods 0.000 claims abstract description 4
- 238000002791 soaking Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 abstract description 13
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/02—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets
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- C21—METALLURGY OF IRON
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- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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- 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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- 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
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- 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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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
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Abstract
The invention relates to leveling-free tempering-free HB450 grade wear-resistant steel, which comprises the following chemical components in percentage by weight: c: 0.12% -0.18%, Si: 0.15-0.40%, Mn: 1.0-2.0%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, Al S: 0.01 to 0.06 percent, less than or equal to 0.02 percent of Ti, less than or equal to 0.25 percent of Cr, less than or equal to 0.0005 percent of B, and the balance of Fe and inevitable impurities. The production method adopts a blast furnace molten iron, molten iron desulphurization, converter smelting, LF + RH refining, continuous casting, heating, rolling, cooling, coiling, leveling and transverse cutting process route. The alloy content is low, and the performance is superior to the level of quenched and tempered wear-resistant steel of the same alloy; the process is simple, leveling and heat treatment are not needed, equipment investment is saved, and production efficiency is improved; the plate shape after transverse cutting is within 5mm/m in mass; the performance is stable and excellent, the hardness level is HB450 level, and the elongation is more than 12%.
Description
Technical Field
The invention relates to the field of wear-resistant steel manufacturing, in particular to leveling-free tempering-free HB450 grade wear-resistant steel and a production method thereof.
Background
The main domestic iron and steel enterprises such as Bao steel, saddle steel, ripple steel, south steel, dance steel and the like mainly adopt an off-line quenching and tempering process to produce wear-resistant steel, the organization type is mainly tempered martensite, the quality is stable, the performance is excellent, and the downstream industry is approved.
The invention patent of publication (publication) No. CN105543676A provides a martensite-ferrite dual-phase wear-resistant steel plate and a preparation method thereof, wherein the volume fraction of a martensite structure is more than 90%, the hardness is between 480 HB and 560HB, and the martensite-ferrite dual-phase wear-resistant steel plate is prepared by using specific dosage of C, Si, Mn, P, S, Nb, V, Ti, Mo, Ni, Cr, Al, B, N, Fe and other elements, has high hardness and good low-temperature toughness and wear resistance, is beneficial to the manufacture of mechanical parts under severe environment, especially under extremely low temperature conditions, has simple preparation method process, can obtain the martensite-ferrite dual-phase structure, comprehensively improves the hardness, low-temperature toughness and wear resistance of the obtained martensite-ferrite dual-phase wear-resistant steel plate, is suitable for large-scale production.
Publication (publication) No. CN106917051A discloses a corrosion-resistant dual-phase wear-resistant steel plate and a production method thereof, wherein the steel plate comprises the following chemical components in percentage by weight: c is less than or equal to 0.13 percent, Si is less than or equal to 0.60 percent, Mn: 1.60 percent of the total Fe-based alloy, 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 Al, less than or equal to 1.20 percent of Cr, less than or equal to 0.30 percent of Mo, and the balance of Fe and inevitable impurities. The production method comprises the working procedures of heating, rolling and heat treatment, and the chemical composition design of the method adopts C, Mn, Cr and Mo for solid solution strengthening, so that the steel plate has good structure, mechanical property, corrosion resistance, wear resistance and welding property, and can be widely used in corrosion-resistant and wear-resistant environments.
Publication (publication) No. CN108396248A discloses a corrosion-resistant double-phase wear-resistant steel plate with 690-grade yield strength and a production method thereof, wherein the steel plate comprises the following chemical components in percentage by weight: the steel plate is characterized by comprising the following components, by weight, not more than 0.15% of C, not more than 0.60% of Si, not more than 1.20% of Mn, not more than 0.015% of P, not more than 0.003% of S, not more than 0.60% of Al, not more than 1.20% of Cr, not more than 0.40% of Mo, not more than 0.0030% of B, not more than 0.020% of Ti, and the balance Fe and inevitable impurities, wherein the steel plate is subjected to solid solution strengthening by adopting C, Mn, Cr and Mo, and trace B elements are added to improve the hardenability of the steel, so that the steel plate has good texture, mechanical property, corrosion resistance, wear resistance and welding property, and is low in strength level and yield ratio and suitable for coil pipes, and the wear resistance of the corrosion-resistant dual-phase wear-resistant steel is consistent with that of NM360E, but the strength and hardness of the steel are far lower than that of NM360E, so that the requirements of the corrosion-resistant wear-resistant steel can be better met, the impact toughness at 30 ℃ is excellent, and can be widely applied to corrosion-resistant wear-resistant environments, and has wide application prospects.
Therefore, the existing wear-resistant steel has the technical problems of high alloy content, low strength level and the like, so that the component process design is necessary, the production difficulty is reduced, and the product quality is improved.
Disclosure of Invention
The invention aims to solve the technical problem of providing leveling-free tempering-free HB450 grade wear-resistant steel and a production method thereof, so as to overcome the defects in the prior art.
The technical scheme for solving the technical problems is as follows: a leveling-free tempering-free HB450 grade wear-resistant steel comprises the following chemical components in percentage by weight:
c: 0.12% -0.18%, Si: 0.15-0.40%, Mn: 1.0-2.0%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, Als: 0.01 to 0.06 percent, less than or equal to 0.02 percent of Ti, less than or equal to 0.25 percent of Cr, less than or equal to 0.0005 percent of B, and the balance of Fe and inevitable impurities.
A production method of leveling-free and tempering-free HB 450-grade wear-resistant steel comprises the following steps:
the method adopts a blast furnace molten iron, molten iron desulphurization, converter smelting, LF + RH refining, continuous casting, heating, rolling, cooling, coiling, leveling and transverse cutting process route.
Further, the heating is specifically:
the temperature of the second addition and soaking end section is 1220-1310 ℃, the second addition soaking time is more than or equal to 60min, the total in-furnace time is controlled to be more than or equal to 140min, the complete solid solution and full austenitization of alloy elements are ensured, and the temperature of the plate blank is ensured to be uniform.
Further, the rolling includes:
rough rolling: the rough rolling outlet temperature is 1050-1120 ℃, and the thickness of the intermediate billet is 30-50 mm;
finish rolling: the initial rolling temperature of finish rolling is 970-1070 ℃, the rolling speed is 3-7 m/s, the final rolling temperature of finish rolling is 800-900 ℃, the higher finish rolling inlet temperature is favorable for reducing the rolling load of F1-F4 stands and is also favorable for the distribution of the rolling load in the finish rolling stage, the total reduction rate in the finish rolling stage is not too large, the finish rolling load can be reduced, the uniformity of plastic deformation in the finish rolling stage is also favorable, the internal stress of a rolled steel plate is more uniform, and a better rolled plate shape is obtained.
Further, cooling:
immediately cooling the rolled FT7 at a cooling speed of 50-100 ℃/s to 550-650 ℃;
air cooling for 1-5 s;
the cooling speed is 20 ℃/s-100 ℃/s, the steel coil is cooled to the range of 100-200 ℃ for coiling, the online quenching is realized, the coiling temperature is too high to obtain uniform and fine martensite, the strength, the hardness and the wear resistance cannot be ensured, the temperature of the steel coil self-tempering process cannot be ensured, and the application problems of cracking and the like can occur in the use process.
Furthermore, the thickness range of the leveling-free tempering-free HB 450-grade wear-resistant steel is 2-15 mm.
The reasons for setting the component range and the process key point in the invention are as follows:
1) c is the cheapest element for improving the strength of the material, the hardness and the strength are improved along with the increase of the carbon content, but the ductility, the toughness and the welding performance are reduced, and the weight percentage content of C is only 0.12 to 0.18 percent in comprehensive consideration;
2) si has weak hardenability, is far inferior to Cr and Mn, can reduce the diffusion speed of carbon in ferrite, but is easy to generate quenching cracks and can also deteriorate the surface quality when the Si is too high, and the Si content is preferably 0.15-0.40 percent by weight in comprehensive consideration;
3) mn can obviously reduce the Ar1 temperature, the austenite decomposition speed and the martensite transformation temperature of steel, increase the residual austenite content in the final structure and improve the comprehensive performance, and can also obviously reduce the critical quenching speed of the steel, and the hardness and the strength can be improved by infinite solid solution with Fe, but if the Mn content is too high, the tempering brittleness of the steel can be increased, and serious center segregation is caused, and the Mn weight percentage content is preferably 1.0-2.0 percent in comprehensive consideration;
4) als can be deoxidized in steel and can also play a role in refining grains, and the comprehensive consideration shows that Als has the advantages that the alloy has the ratio of Als: 0.01 to 0.06 percent;
5) ti can combine with N to generate stable TiN in the solidification process of steel, austenite grain boundary migration can be strongly hindered, austenite grains are refined, Ti and C combine to generate TiC, the precipitation strengthening effect can be achieved, the toughness can be improved by adding a trace amount of Ti, and the weight percentage content of Ti is preferably less than or equal to 0.02 percent in comprehensive consideration;
6) cr: cr can improve hardenability, but too high Cr reduces processability and weldability, and the Cr weight percentage r is preferably less than or equal to 0.25 percent in comprehensive consideration;
7) b: the hardenability of the steel can be greatly improved by adding a small amount of B, but when the amount of B is too much, the B is easy to enrich in grain boundaries, the grain boundary binding energy is reduced, the steel plate is more prone to fracture along the grains when being subjected to impact load, and the low-temperature impact energy of the steel plate is reduced, so that the adding amount of B is less than or equal to 0.0005 percent.
8) P, S is a harmful impurity element in steel, P in steel is easy to form segregation in steel, the toughness and welding performance of steel are reduced, S is easy to form plastic sulfide, steel plate is layered, and the performance of steel plate is deteriorated, so the lower the P, S content is, the better, the comprehensive consideration is that the P, S content of steel is P less than or equal to 0.015 percent, and S less than or equal to 0.005 percent.
The invention has the advantages that:
1. the alloy content is low, and the performance is superior to the level of quenched and tempered wear-resistant steel of the same alloy;
2. the process is simple, leveling and heat treatment are not needed, equipment investment is saved, and production efficiency is improved;
3. the plate shape after transverse cutting is within 5mm/m in mass;
4. the performance is stable and excellent, the hardness is HB450, and the elongation is more than 12%;
5. the application requirements of downstream users such as engineering machinery, commercial vehicles and the like are met.
Drawings
FIG. 1 is a plate shape quality diagram of leveling-free tempering-free HB450 wear-resistant steel.
Detailed Description
The principles and features of this invention are described below in conjunction with examples which are set forth to illustrate, but are not to be construed to limit the scope of the invention.
A leveling-free tempering-free HB450 grade wear-resistant steel comprises the following chemical components in percentage by weight:
c: 0.12% -0.18%, Si: 0.15-0.40%, Mn: 1.0-2.0%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, Als: 0.01 to 0.06 percent, less than or equal to 0.02 percent of Ti, less than or equal to 0.25 percent of Cr, less than or equal to 0.0005 percent of B, and the balance of Fe and inevitable impurities.
The chemical components and the weight percentages of the chemical components of leveling-free and tempering-free HB 450-grade wear-resistant steel are shown in table 1 in examples 1 to 10 and comparative examples 1 to 2, and the specific chemical components and the weight percentages of the conventional wear-resistant steel are also shown in table 1.
TABLE 1
The invention relates to leveling-free tempering-free HB450 grade wear resistant steel and a production method thereof, which adopts a blast furnace molten iron, molten iron desulphurization, converter smelting, LF + RH refining, continuous casting, heating, rough rolling + finish rolling, cooling, coiling, flattening and transverse cutting process route, wherein,
1) the thickness range is 2 mm-15 mm;
2) heating: the temperature of the second addition and soaking tail section is 1220-1310 ℃, the time of the second addition and soaking is more than or equal to 60min, the total in-furnace time is controlled to be more than or equal to 140min, the complete solid solution and full austenitization of alloy elements are ensured, and the temperature of the plate blank is ensured to be uniform;
3) rough rolling: the rough rolling outlet temperature is 1050-1120 ℃, and the thickness of the intermediate billet is 30-50 mm;
4) finish rolling: the initial rolling temperature of finish rolling is 970-1070 ℃, the rolling speed is 3-7 m/s, the final rolling temperature of finish rolling is 800-900 ℃, the higher finish rolling inlet temperature is favorable for reducing the rolling load of F1-F4 stands and is also favorable for the distribution of the rolling load in the finish rolling stage, the total reduction rate in the finish rolling stage is not too large, the finish rolling load can be reduced, the uniformity of plastic deformation in the finish rolling stage is also favorable, the internal stress of a rolled steel plate is more uniform, and a better rolled plate shape is obtained;
5) and (3) cooling: cooling immediately after FT7 is discharged, wherein the cooling speed is 50 ℃/s-100 ℃/s, and the temperature is cooled to 550-650 ℃;
air cooling for 1-5 s;
the cooling speed is 20 ℃/s-100 ℃/s, the steel coil is cooled to the range of 100-200 ℃ for coiling, the online quenching is realized, the coiling temperature is too high to obtain uniform and fine martensite, the strength, the hardness and the wear resistance cannot be ensured, the temperature of the steel coil self-tempering process cannot be ensured, and the application problems of cracking and the like can occur in the use process.
Specific process data of the production process characteristics in examples 1 to 10 and comparative examples 1 to 2 are shown in tables 2 and 3.
TABLE 2
TABLE 3
According to GB/T228 and GB/T231 national standards, performances of leveling-free tempering-free HB 450-grade wear-resistant steel in test examples 1-10, a production method and comparative examples 1-2 are shown in Table 4.
It can be seen that in the case of lower chemical components in the 10 processes of example, the mechanical properties and the like are maintained at the same level as those of the conventional wear-resistant steel, while in the comparative example, the alloy content is higher, which indicates that the performance is more excellent in the example on the premise of lower alloy content, and fig. 1 is a plate shape quality diagram of the leveling-free and tempering-free HB 450-grade wear-resistant steel prepared by the method of the present invention.
TABLE 4
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (6)
1. The leveling-free tempering-free HB450 grade wear-resistant steel is characterized by comprising the following chemical components in percentage by weight:
c: 0.12% -0.18%, Si: 0.15-0.40%, Mn: 1.0-2.0%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, Als: 0.01 to 0.06 percent, less than or equal to 0.02 percent of Ti, less than or equal to 0.25 percent of Cr, less than or equal to 0.0005 percent of B, and the balance of Fe and inevitable impurities.
2. The production method of the leveling-free and tempering-free HB 450-grade wear-resistant steel as claimed in claim 1, characterized in that:
the method adopts a blast furnace molten iron, molten iron desulphurization, converter smelting, LF + RH refining, continuous casting, heating, rolling, cooling, coiling, leveling and transverse cutting process route.
3. The production method of the leveling-free and tempering-free HB 450-grade wear-resistant steel as claimed in claim 2, characterized in that: the heating is specifically as follows:
the temperature of the second addition and soaking end section is 1220-1310 ℃, the second addition and soaking time is more than or equal to 60min, and the total in-furnace time is controlled to be more than or equal to 140 min.
4. The production method of the leveling-free and tempering-free HB 450-grade wear-resistant steel as claimed in claim 2, characterized in that: the rolling comprises the following steps:
rough rolling: the rough rolling outlet temperature is 1050-1120 ℃, and the thickness of the intermediate billet is 30-50 mm;
finish rolling: the start rolling temperature of finish rolling is 970-1070 ℃, the rolling speed is 3-7 m/s, and the finish rolling temperature is 800-900 ℃.
5. The production method of the leveling-free and tempering-free HB 450-grade wear-resistant steel as claimed in claim 2, characterized in that: and (3) cooling:
immediately cooling the rolled FT7 at a cooling speed of 50-100 ℃/s to 550-650 ℃;
air cooling for 1-5 s;
cooling at 20-100 deg.c/s to 100-200 deg.c and coiling.
6. The production method of the leveling-free and tempering-free HB 450-grade wear-resistant steel as claimed in claim 2, characterized in that: the thickness range of the leveling-free tempering-free HB 450-grade wear-resistant steel is 2-15 mm.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116287970A (en) * | 2022-09-09 | 2023-06-23 | 武汉钢铁有限公司 | HB 450-grade wear-resistant steel with excellent welding performance and production method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107217202A (en) * | 2017-07-19 | 2017-09-29 | 武汉钢铁有限公司 | The abrasion-resistant stee and its manufacture method of a kind of 500 grades of Brinell hardness |
| CN111607736A (en) * | 2020-06-28 | 2020-09-01 | 武汉钢铁有限公司 | Wear-resistant steel with excellent welding performance and production method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107217202A (en) * | 2017-07-19 | 2017-09-29 | 武汉钢铁有限公司 | The abrasion-resistant stee and its manufacture method of a kind of 500 grades of Brinell hardness |
| CN111607736A (en) * | 2020-06-28 | 2020-09-01 | 武汉钢铁有限公司 | Wear-resistant steel with excellent welding performance and production method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116287970A (en) * | 2022-09-09 | 2023-06-23 | 武汉钢铁有限公司 | HB 450-grade wear-resistant steel with excellent welding performance and production method thereof |
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Application publication date: 20211112 |