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Wear-resisting steel plate for extremely cold area and manufacturing method

A technology of wear-resistant steel plate and manufacturing method, which is applied in the field of wear-resistant steel manufacturing to achieve the effects of reducing overheat sensitivity, delaying tempering temperature, and improving hardenability

Inactive Publication Date: 2019-05-28
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Many domestic steel mills have the production process of wear-resistant steel, but for the application environment of polar wear-resistant steel, there is no substantive report on ultra-low temperature wear-resistant steel. is negligible

Method used

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  • Wear-resisting steel plate for extremely cold area and manufacturing method

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Embodiment 1

[0024] A wear-resistant steel plate for extremely cold regions with a Brinell hardness of 450HB provided in this example, its chemical composition and mass percentage are as follows: C: 0.19%, Si: 0.28%, Mn: 1.25%, P: 0008, S≤ 0.003%, Cr: 0.20%, Mo: 0.20%, Ni: 0.50%, Ti: 0.018%, Nb: 0.020%, B: 0.0014%, and the rest are Fe and unavoidable impurities.

[0025] The manufacturing method of the above-mentioned steel plate comprises the following steps: hot metal desulfurization pretreatment-converter smelting-LF+RH refining-continuous casting-slab slow cooling-slab heating-phosphorus removal-rolling-air cooling-flaw detection-shot blasting-quenching-back Fire-straightening-cutting-sampling-printing marking-inspection-warehousing.

[0026] The molten steel smelted according to the ratio is vacuum degassed and then continuously cast. The thickness of the continuous casting slab is 220mm. The steel slab is heated to a furnace temperature of 1205°C. The thickness of the rolled product...

Embodiment 2

[0028] A wear-resistant steel plate for extremely cold regions with a Brinell hardness of 450HB provided in this example, its chemical composition and mass percentage are as follows: C: 0.20%, Si: 0.22%, Mn: 1.26%, P: 0008, S≤ 0.003%, Cr: 0.25%, Mo: 0.22%, Ni: 0.52%, Ti: 0.015%, Nb: 0.021%, B: 0.0015%, and the rest are Fe and unavoidable impurities.

[0029] The manufacturing method of the above-mentioned steel plate comprises the following steps: hot metal desulfurization pretreatment-converter smelting-LF+RH refining-continuous casting-slab slow cooling-slab heating-phosphorus removal-rolling-air cooling-flaw detection-shot blasting-quenching-back Fire-straightening-cutting-sampling-printing marking-inspection-warehousing.

[0030] The molten steel smelted according to the ratio is vacuum degassed and then continuously cast. The thickness of the continuous casting slab is 150mm. The steel slab is heated to a furnace temperature of 1200°C. Rolling in the crystallization zone...

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Abstract

The invention discloses a wear-resisting steel plate for an extremely cold area. Thechemical components comprise, by mass percent, 0.18 to 0.23% of C, 0.20 to 0.50% of Si, 1.0 to 1.50% of Mn, not larger than 0.010% of P, not larger than 0.002% of S, 0.10 to 0.30% of Cr, 0.10 to 0.30% of Mo, 0.30 to 0.8% of Ni, 0.008 to 0.030% of Ti, 0.012 to 0.040% of Nb, 0.0008 to 0.0025% of B, and the balance Feand inevitable impurities. Medium and high carbon and alloying component design is adopted, an auxiliary rolling and offline heat treatment method is adopted, the obtained steel plate has the Brinellhardness being 450 HBW level, and -60 DEG C low temperature impact toughness is larger than or equal to 34 J.

Description

technical field [0001] The invention relates to the field of wear-resistant steel manufacturing, in particular to a wear-resistant steel plate for extremely cold regions with a Brinell hardness of 450HB and a manufacturing method thereof. Background technique [0002] Compared with traditional wear-resistant cast steel, low-alloy wear-resistant steel plate has low alloy content, high low-temperature impact toughness, good comprehensive properties such as bending and forming, flexible and convenient production, and low production cost. It is widely used in work The conditions are harsh, requiring high strength and hardness, good wear resistance engineering, mining, construction, agriculture, cement, port, electric power and metallurgy and other mechanical equipment manufacturing, such as bulldozers, loaders, excavators, dump trucks, ball mills and various A variety of mining machinery, grab buckets, stackers and reclaimers, feeding bending structures, etc. Such parts general...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/48C22C38/50C22C38/54C21C7/064C21C7/10C21D8/02C22C33/04
Inventor 姜在伟杨柳闫强军张仪杰姜辉侯中华
Owner NANJING IRON & STEEL CO LTD
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