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Bainite-based wear-resistant steel and production method thereof

A production method, bainite technology, applied in the field of hot strip rolling, can solve the problems of difficulty in popularization and poor plasticity, and achieve the effects of low cost, improved wear life and good toughness

Inactive Publication Date: 2021-03-26
PANGANG GROUP RESEARCH INSTITUTE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because this type of steel obtains high wear resistance through rolling control, its plasticity is poor, and it is difficult to popularize and use it for parts that require forming.

Method used

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  • Bainite-based wear-resistant steel and production method thereof
  • Bainite-based wear-resistant steel and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The composition of molten steel after the steelmaking step is: 0.18% by weight of C, 0.38% by weight of Ti, 0.22% by weight of Cr, 0.19% by weight of Mo, the balance is Fe and unavoidable impurities, and the thickness of the continuous casting slab is 230mm , and then soaked in a heating furnace at 1250°C, the thickness of the intermediate billet after rough rolling is 43mm, the start rolling temperature of finish rolling is 1060°C, and the finish rolling temperature is 840°C. The thickness of the steel plate after finishing rolling is 4.0mm, and then cooled to 460°C at a cooling rate of 62°C / s for coiling after the first stage of interlayer cooling. The coil yield strength (ReL), tensile strength (Rm), elongation (A), impact value at -20°C, and wear resistance index are shown in Table 1.

Embodiment 2

[0041] The composition of molten steel after the steelmaking step is: 0.21% by weight of C, 0.48% by weight of Ti, 0.021% by weight of Nb, 0.25% by weight of Mo, the balance is Fe and unavoidable impurities, and the thickness of the continuous casting slab is 200mm , and then soaked in a heating furnace at 1230°C, the thickness of the intermediate billet after rough rolling is 45mm, the starting temperature of finish rolling is 950°C, and the finishing temperature of finish rolling is 810°C. The thickness of the steel plate after finish rolling is 5.0mm, and then cooled to 530°C at a cooling rate of 54°C / s for coiling after the first stage of interlayer cooling. The coil yield strength (ReL), tensile strength (Rm), elongation (A), impact value at -20°C, and wear resistance index are shown in Table 1.

Embodiment 3

[0043] The composition of molten steel after the steelmaking step is: 0.24% by weight of C, 0.43% by weight of Ti, 0.012% by weight of Nb, 0.36% by weight of Cr, 0.28% by weight of Mo, and the balance is Fe and unavoidable impurities. The thickness of the cast slab is 220mm, and then it is soaked in a heating furnace at 1240°C. The thickness of the intermediate slab after rough rolling is 36mm. The thickness of the steel plate after finish rolling is 5.0mm, and then cooled to 420°C at a cooling rate of 57°C / s for coiling after the first stage of interlayer cooling. The coil yield strength (ReL), tensile strength (Rm), elongation (A), impact value at -20°C, and wear resistance index are shown in Table 1.

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Abstract

The invention belongs to the technical field of hot continuous rolling plate strips, and particularly relates to bainite-based wear-resistant steel and a production method thereof. The technical problem to be solved by the invention is to provide the bainite-based wear-resistant steel which comprises the following chemical components in percentage by mass: 0.15 to 0.25 percent of C, 0.35 to 0.50 percent of Ti, 0 to 0.05 percent of Nb, 0 to 0.5 percent of Cr, 0.1 to 0.3 percent of Mo and the balance of Fe and inevitable impurities. According to the bainite-based wear-resistant steel and the production method thereof provided by the invention, micron-nano double-scale Ti (C, N) is separated out to serve as a hard phase, so that the wear-resistant service life is prolonged; and through controlling the matrix structure to be granular bainite and a small amount of acicular ferrite, the material is ensured to have an excellent performance.

Description

technical field [0001] The invention belongs to the technical field of continuous hot rolling strips, and in particular relates to a bainite-based wear-resistant steel and a production method thereof. Its structure is granular bainite + a small amount of acicular ferrite. Background technique [0002] According to relevant foreign experimental data, if the weight of the vehicle itself is reduced by 10%, the fuel consumption can be reduced by 5-8%. For trucks, reducing their own weight can also improve the effective load quality, that is, increase the quality utilization factor, thereby improving transportation efficiency, reducing transportation costs, and at the same time reducing fuel costs. At present, the lightweight materials widely used in trucks at home and abroad include high-strength steel, aluminum alloy and magnesium alloy. However, for vehicles transporting ore, coal, and sand, increasing the strength of the carriage alone to reduce its own quality is far from ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/28C22C38/26C22C38/22C21D8/02
CPCC21D8/0205C21D8/0226C21D2211/002C22C38/22C22C38/26C22C38/28
Inventor 叶晓瑜宋裕左军周伟刘勇田维兵
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD
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