CN118726852A - Wide-thick high-toughness wear-resistant steel based on hot continuous rolling production line and production method thereof - Google Patents
Wide-thick high-toughness wear-resistant steel based on hot continuous rolling production line and production method thereof Download PDFInfo
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- CN118726852A CN118726852A CN202410699907.5A CN202410699907A CN118726852A CN 118726852 A CN118726852 A CN 118726852A CN 202410699907 A CN202410699907 A CN 202410699907A CN 118726852 A CN118726852 A CN 118726852A
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- 238000005096 rolling process Methods 0.000 title claims abstract description 42
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 37
- 239000010959 steel Substances 0.000 title claims abstract description 37
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 30
- 238000010438 heat treatment Methods 0.000 claims abstract description 21
- 238000005496 tempering Methods 0.000 claims abstract description 14
- 238000010791 quenching Methods 0.000 claims abstract description 12
- 230000000171 quenching effect Effects 0.000 claims abstract description 12
- 238000001816 cooling Methods 0.000 claims abstract description 9
- 238000003723 Smelting Methods 0.000 claims abstract description 4
- 238000005266 casting Methods 0.000 claims abstract description 4
- 238000009749 continuous casting Methods 0.000 claims abstract description 4
- 150000001875 compounds Chemical class 0.000 claims abstract description 3
- 230000009467 reduction Effects 0.000 claims description 9
- 229910052717 sulfur Inorganic materials 0.000 claims description 7
- 239000012535 impurity Substances 0.000 claims description 5
- 229910052698 phosphorus Inorganic materials 0.000 claims description 5
- 229910045601 alloy Inorganic materials 0.000 abstract description 4
- 239000000956 alloy Substances 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 2
- 238000012797 qualification Methods 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 229910001566 austenite Inorganic materials 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000005336 cracking Methods 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229910052729 chemical element Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
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Abstract
A wide and thick high-toughness wear-resistant steel based on a hot continuous rolling production line comprises the following components in percentage by weight: c:0.17 to 0.25 percent, mn:0.5 to 2 percent, P is less than or equal to 0.020 percent, S is less than or equal to 0.010 percent, als:0.03 to 0.06 percent of Ti:0.010 to 0.02 percent, si is not more than 0.3 percent or Cr is not more than 0.6 percent or B is not more than 0.0003 percent or any two or more of the above materials are added in a compound way according to any proportion; the production method comprises the following steps: heating a casting blank after conventional smelting and continuous casting to form a blank; rough rolling; finish rolling; cooling; coiling; quenching; tempering; and (5) standby application. Compared with the prior art, the invention overcomes the difficult problem that the traditional hot continuous rolling production line is difficult to coil and transversely cut, and obviously reduces the production difficulty; the low-temperature toughness is excellent, namely, the impact energy at the temperature of minus 40 ℃ can reach more than 40J, and the alloy is not cracked when being used in a low-temperature environment; because of high-temperature coiling, the plate shape quality of the hot rolled coil is obviously improved, the unevenness rate can be optimally less than 2mm/m, and the plate shape qualification rate of the finished product is improved by not less than 30 percent.
Description
Technical Field
The invention relates to hot continuous rolling wear-resistant steel and a production method thereof, in particular to wide and thick high-toughness wear-resistant steel based on a hot continuous rolling production line and a production method thereof, which are suitable for producing wear-resistant steel with the width of 1500-2100 mm and the thickness of 10-30 mm in the hot continuous rolling production line.
Background
The low-alloy high-strength wear-resistant steel is widely applied to mechanical equipment such as metallurgy, mines, building materials, railways, electric power, coal and the like, has severe use environment and has increasingly high quality requirements on strength, toughness, hardness and wear resistance. In particular low temperature toughness, has a profound effect on the risk of cracking during application. The traditional thin wear-resistant steel is optimized through rolling and cooling processes, and the lower coiling temperature is beneficial to refining microstructure, so that low-temperature toughness is improved. However, as thickness increases, the strength of thick gauge steel coils at lower coiling temperatures presents a significant challenge for the coiling and crosscutting equipment. Therefore, for hot continuous rolling thick wear-resistant steel, the coiling temperature is usually higher, the original grains are coarse, the low-temperature toughness at-40 ℃ can only reach the level of 10-20J, and the low-temperature environment application requirement is difficult to meet in order to ensure the equipment safety.
And (3) searching:
The document of Chinese patent publication No. CN102605234A provides a wear-resistant steel plate and a manufacturing method thereof, the weight percentage of the components is ：C：0.08-0.24％、Si：0.10-0.30％、Mn：0.70-1.70％、P：≤0.050％、S：≤0.030％、Cr：≤1.00％、Mo：≤0.60％、Al：0.01-0.10％、B：0.0005-0.0040％、Ti：0.005-0.06％, and the following is satisfied: cr+Mo is more than or equal to 0.15 and less than or equal to 1.20%, al+Ti is more than or equal to 0.011% and less than or equal to 0.15%, and the balance is Fe and unavoidable impurities. The casting-rolling control-tempering heat treatment process is adopted for production, has excellent performance, is suitable for manufacturing equipment which is easy to wear in engineering machinery, and has the defects that the low-temperature toughness is generally low, the low-temperature toughness can only reach about 10-20J at-40 ℃, and the cracking risk is high when the casting-rolling control-tempering heat treatment process is applied to the low-temperature environment at-40 ℃.
The document with the Chinese patent publication number of CN108546874A discloses a low-cost HB400 grade medium plate wear-resistant steel plate and a manufacturing method, wherein the chemical element components and the weight percentages thereof are as follows: c:0.19 to 0.22 percent of Si:1.1 to 1.3 percent of Mn:3 to 3.3 percent of Ni:0.30 to 0.36 percent of Mo:0.15 to 0.32 percent, V:0.15 to 0.25 percent, P is less than or equal to 0.012 percent, S is less than or equal to 0.009 percent, V+Mo is less than or equal to 0.35 percent and less than or equal to 0.45 percent, the balance is Fe and unavoidable impurities, and the thickness of the steel plate is 20 to 70mm. The wear-resistant steel plate has good hardenability, uniform structure performance and small residual stress, avoids a microcrack source possibly caused by repeated high-temperature heating of the wear-resistant steel, obviously reduces the risk of cracking in the application process, and has tensile strength of more than 1200MPa and Brinell hardness of more than 380. The alloy has the defects of higher alloy cost and increased production cost and popularization cost for downstream users.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the wide and thick high-toughness wear-resistant steel based on the hot continuous rolling line, which is produced in the hot continuous rolling line and has the width of 1500-2100 mm, the thickness of 10-30 mm and the Brinell hardness of the steel plate of not lower than 370, so that the production difficulty is reduced, the production equipment is not damaged, and the low-temperature impact energy of minus 40 ℃ is not lower than 40J, and the production method.
Measures for achieving the above object:
A wide and thick high-toughness wear-resistant steel based on a hot continuous rolling production line comprises the following components in percentage by weight: c:0.17 to 0.25 percent, mn:0.5 to 2 percent, P is less than or equal to 0.020 percent, S is less than or equal to 0.010 percent, als:0.03 to 0.06 percent of Ti: 0.010-0.02%, si is not more than 0.3%, cr is not more than 0.6%, B is not more than 0.0003%, or two or more of them are added in a composite manner according to any proportion, and the balance is Fe and impurities.
A method for producing wide and thick high-toughness wear-resistant steel based on a hot continuous rolling production line comprises the following steps:
1) Heating a casting blank after conventional smelting and continuous casting to form a blank: the heating temperature is controlled to be 1180-1230 ℃, and the heating time is controlled to be
120-150 Minutes, in the heating time: the heating time of the high temperature section is not less than 60 minutes;
2) Rough rolling is carried out, and the reduction rate of at least one pass in the first three passes is controlled to be not lower than 20%;
3) Performing finish rolling, and controlling: the total accumulated rolling reduction of the finish rolling stage is not less than 60%, and the accumulated rolling reduction of the last three times is not less than 40%; the final rolling temperature is controlled between 780 and 820 ℃;
4) Cooling to coiling temperature at cooling speed of 3-10 deg.c/s;
5) Coiling, wherein the coiling temperature is controlled to be 700-750 ℃;
6) Quenching, controlling the quenching temperature to be 790-830 ℃, and preserving heat for 5-10 min at the quenching temperature;
7) Tempering and controlling: tempering temperature is 150-200 ℃ and tempering time is 10-30 min;
8) And (5) standby application.
Preferably: the heating time of the high temperature section is 63-66 min.
Preferably: the quenching temperature is 790-810 ℃.
The action and mechanism of each raw material and main process in the invention
C: c is the cheapest element for improving the strength of the material, and the hardness and strength are improved with the increase of the carbon content, but the toughness and welding performance are reduced. Comprehensively considering that the weight percentage of C is 0.17 to 0.25 percent;
si: si can reduce the diffusion rate of carbon in ferrite, promote ferrite formation, and also deteriorate the surface quality. Considering comprehensively, the weight percentage of Si is preferably 0 to 0.3 percent;
Mn: mn obviously reduces Ar1 temperature and austenite decomposition speed, improves supercooled austenite stability, promotes austenite release stress, increases residual austenite content in a final structure, and improves cold bending performance, but if the Mn content is too high, tempering brittleness can be increased, serious center segregation is caused, and the Mn weight percentage is preferably 0.5-2% comprehensively considered.
Als: als can deoxidize in steel, reduce the content of inclusions, and also play a role in refining grains, and comprehensively consider that Als is 0.03-0.06%;
Ti: ti has extremely strong affinity with C, N in steel to form stable Ti (C, N) compound, and is induced to separate out in the controlled rolling process, thereby effectively preventing recrystallization, and the functions of separating out and refining grains are obvious, and the weight percentage of Ti is preferably 0.010-0.020% comprehensively considered;
Cr: cr can improve hardenability, can improve tempering stability, reduce the cooling rate of the obtained martensite, but too high Cr reduces workability and weldability, and is suitable for comprehensively considering that the weight percentage of Cr is 0-0.6%;
B: the hardenability can be greatly improved by adding a trace amount of B into the steel B, but when B is too much, the B is easy to enrich in crystal boundaries, the crystal boundary bonding energy can be reduced, so that the steel plate is more prone to fracture along the crystal when being subjected to impact load, and the low-temperature impact energy of the steel plate is reduced, and therefore, the addition amount of B in the invention is less than or equal to 0.0003 percent.
P, S: p and S are harmful impurity elements in steel, P in steel is easy to form segregation in steel, toughness and welding performance of steel are reduced, S is easy to form plastic sulfide, layering is generated on a steel plate, and performance of the steel plate is deteriorated, so that the lower P, S content is, the better P, S content of steel is less than or equal to 0.020% and S is less than or equal to 0.010% in comprehensive consideration.
Compared with the prior art, the invention has the following effects:
1. The difficult problem that the traditional hot continuous rolling production line is difficult to coil and transversely cut is solved, and the production difficulty is remarkably reduced.
2. The low-temperature toughness is excellent, the impact energy at minus 40 ℃ can reach more than 40J, and the low-temperature environment is free from cracking.
3. Under the condition of high-temperature coiling, the plate shape quality of the hot rolled coil is obviously improved, the unevenness rate can be optimally smaller than 2mm/m, and the plate shape qualification rate of the finished product is improved by more than 30 percent.
Detailed Description
The present invention will be described in detail below:
table 1 is a listing of chemical components of each example and comparative example of the present invention;
Table 2 is a list of the main process parameters for each example and comparative example of the present invention;
Table 3 shows a list of performance tests for each example and comparative example of the present invention.
The embodiments of the invention were produced according to the following steps
1) Heating a casting blank after conventional smelting and continuous casting to form a blank: the heating temperature is controlled to be 1180-1230 ℃, and the heating time is controlled to be
120-150 Minutes, in the heating time: the heating time of the high temperature section is not less than 60 minutes;
2) Rough rolling is carried out, and the reduction rate of at least one pass in the first three passes is controlled to be not lower than 20%;
3) Performing finish rolling, and controlling: the total accumulated rolling reduction of the finish rolling stage is not less than 60%, and the accumulated rolling reduction of the last three times is not less than 40%; the final rolling temperature is controlled between 780 and 820 ℃;
4) Cooling to coiling temperature at cooling speed of 3-10 deg.c/s;
5) Coiling, wherein the coiling temperature is controlled to be 700-750 ℃;
6) Quenching, controlling the quenching temperature to be 790-830 ℃, and preserving heat for 5-10 min at the quenching temperature;
7) Tempering and controlling: tempering temperature is 150-200 ℃ and tempering time is 10-30 min;
8) And (5) standby application.
TABLE 1 list of chemical Components (wt%) of examples and comparative examples of the present invention
TABLE 2 list of the main process parameters for each example and comparative example of the present invention
Continuous table 2
TABLE 3 Performance test results list for various examples and comparative examples of the present invention
As can be seen from Table 3, the embodiment can produce the wide and thick high-toughness wear-resistant steel based on a hot continuous rolling production line under the condition of lower components, the performance of the wear-resistant steel is superior to that of the comparative example, particularly the impact energy at-40 ℃ is more than 2 times of that of the comparative example, and the total flow cost is reduced by more than 10%.
This embodiment is merely a best example and is not intended to limit the implementation of the technical solution of the present invention.
Claims (4)
1. A wide and thick high-toughness wear-resistant steel based on a hot continuous rolling production line comprises the following components in percentage by weight: c:
0.17～0.25％，Mn：0.5～2％，P≤0.020％，S≤0.010％，Als：0.03～0.06％，Ti：
0.010 to 0.02 percent, si is not more than 0.3 percent or Cr is not more than 0.6 percent or B is not more than 0.0003 percent or any two or more of them are added in a compound way according to any proportion, and the rest is Fe and impurities.
2. A method for producing the wide and thick high-toughness wear-resistant steel based on the hot continuous rolling line as claimed in claim 1, which comprises the following steps:
1) Heating a casting blank after conventional smelting and continuous casting to form a blank: the heating temperature is controlled to be 1180-1230 ℃, and the heating time is controlled to be
120-150 Minutes, in the heating time: the heating time of the high temperature section is not less than 60 minutes;
2) Rough rolling is carried out, and the reduction rate of at least one pass in the first three passes is controlled to be not lower than 20%;
3) Performing finish rolling, and controlling: the total accumulated rolling reduction of the finish rolling stage is not less than 60%, and the accumulated rolling reduction of the last three times is not less than 40%; the final rolling temperature is controlled between 780 and 820 ℃;
4) Cooling to coiling temperature at cooling speed of 3-10 deg.c/s;
5) Coiling, wherein the coiling temperature is controlled to be 700-750 ℃;
6) Quenching, controlling the quenching temperature to be 790-830 ℃, and preserving heat for 5-10 min at the quenching temperature;
7) Tempering and controlling: tempering temperature is 150-200 ℃ and tempering time is 10-30 min;
8) And (5) standby application.
3. The method for producing the wide-thick high-toughness wear-resistant steel based on the hot continuous rolling line, as claimed in claim 2, is characterized by comprising the following steps: the heating time of the high temperature section is 63-66 min.
4. The method for producing the wide-thick high-toughness wear-resistant steel based on the hot continuous rolling line, as claimed in claim 2, is characterized by comprising the following steps: the quenching temperature is 790-810 ℃.
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| CN202410699907.5A CN118726852A (en) | 2024-05-31 | 2024-05-31 | Wide-thick high-toughness wear-resistant steel based on hot continuous rolling production line and production method thereof |
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