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HB460MPa-grade high-strength high-tenacity fire-crack-resisting wear-resistant steel and producing method thereof

A high-strength, high-toughness technology, applied in the field of HB460MPa grade high-strength and high-toughness fire-crack-resistant wear-resistant steel, can solve the problems of reduced service life and safety factor, easy cracking of wear-resistant steel, and reduced crack resistance. Achieve the effect of making up for the decrease in strength and wear resistance, improving strength and wear resistance, and improving wear resistance and crack resistance

Inactive Publication Date: 2019-12-31
WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention is aimed at the problem that the comprehensive performance of the current martensitic wear-resistant steel is not high, and the crack resistance of the material will be significantly reduced as the hardness increases, resulting in a greatly reduced service life and safety factor, and provides a HB460MPa grade high strength and high Tough fire-cut crack-resistant wear-resistant steel and production method thereof
The invention has low manufacturing cost, simple process and excellent comprehensive performance, and especially solves the problem that martensitic wear-resistant steel is prone to cracks

Method used

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  • HB460MPa-grade high-strength high-tenacity fire-crack-resisting wear-resistant steel and producing method thereof
  • HB460MPa-grade high-strength high-tenacity fire-crack-resisting wear-resistant steel and producing method thereof
  • HB460MPa-grade high-strength high-tenacity fire-crack-resisting wear-resistant steel and producing method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A HB460MPa-grade high-strength, high-toughness fire-cut crack-resistant wear-resistant steel, the steel contains the following chemical components in mass percentages: C: 0.15%, Si: 0.45%, Mn: 1.60%, P: 0.012%, S : 0.010%, Cr: 0.36%, Mo: 0.72%, Nb: 0.043%, Ti: 0.019%, B: 0.0025%, Als: 0.035%, N: 0.0032%, and the rest are Fe and trace impurity elements.

[0038] A production method of HB460MPa grade high-strength high-toughness fire-cut crack-resistant wear-resistant steel, the main production process steps are as follows:

[0039] (1) Slab: Converter smelting-LF furnace refining-RH vacuum treatment, and continuous casting into 200mm thick continuous casting slab, the superheat of molten steel in the tundish is 5°C, the thickness of liquid slag layer is 9mm, and the casting slab casting speed is 0.8m / min;

[0040] (2) Billet heating: set the billet heating temperature to 1200°C, hold time for 3.54 hours, and the upper heating temperature of the heating furnace is 10°C ...

Embodiment 2

[0045] A crack-resistant high-strength wear-resistant steel with a Brinell hardness of 450 and its processing method, its components and weight percentages: C: 0.24%, Si: 0.25%, Mn: 1.35%, P: 0.014%, S: ≤ 0.009%, Cr: 0.30%, Mo: 0.65%, Nb: 0.053%, Ti: 0.028%, B: 0.0035%, Als: 0.038%, N: 0.0030%, and the rest are Fe and trace impurity elements.

[0046] A production method of HB460MPa grade high-strength high-toughness fire-cut crack-resistant wear-resistant steel, the main production process steps are as follows:

[0047] (1) Slab: Converter smelting-LF furnace refining-RH vacuum treatment, and continuous casting into 200mm thick continuous casting slab, tundish molten steel superheat 8℃, liquid slag layer thickness 10mm, casting slab casting speed 0.85m / min;

[0048] (2) Billet heating: set the billet heating temperature to 1215°C, holding time for 3.8 hours, and the upper heating temperature of the heating furnace is 16°C higher than the lower heating temperature;

[0049]...

Embodiment 3

[0053] A crack-resistant high-strength wear-resistant steel with a Brinell hardness of 450 and its processing method, its components and weight percentages: C: 0.19%, Si: 0.37%, Mn: 1.53%, P: 0.012%, S: ≤ 0.008%, Cr: 0.42%, Mo: 0.56%, Nb: 0.048%, Ti: 0.023%, B: 0.0024%, Als: 0.029%, N: 0.0028%, and the rest are Fe and trace impurity elements.

[0054] A production method of HB460MPa grade high-strength high-toughness fire-cut crack-resistant wear-resistant steel, the main production process steps are as follows:

[0055] (1) Slab: Converter smelting-LF furnace refining-RH vacuum treatment, and continuous casting into 200mm thick continuous casting slab, tundish molten steel superheat 15℃, liquid slag layer thickness 14mm, casting slab casting speed 0.9m / min;

[0056] (2) Billet heating: set the billet heating temperature to 1220°C, holding time for 3.7 hours, and the upper heating temperature of the heating furnace is 20°C higher than the lower heating temperature;

[0057]...

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Abstract

The invention relates to HB460MPa-grade high-strength high-tenacity fire-crack-resisting wear-resistant steel and a producing method thereof. The steel comprises, by mass percent, 0.15%-0.24% of C, 0.20%-0.50% of Si, 1.30%-1.60% of Mn, not larger than 0.015% of P, not larger than 0.015% of S, 0.30%-0.65% of Cr, 0.40%-0.80% of Mo, 0.03%-0.06% of Nb, 0.015%-0.035% of Ti, 0.001%-0.005% of B, 0.010%-0.040% of Als, not larger than 0.0035% of N and the balance Fe and trace impure elements. According to the HB460MPa-grade high-strength high-tenacity fire-crack-resisting wear-resistant steel and the producing method thereof, the alloy addition amount is small, the alloy cost is low, and the HB460MPa-grade high-strength high-tenacity fire-crack-resisting wear-resistant steel belongs to resource-saving steel; a short process manufacturing process is adopted in the producing method, energy loss caused by a complex heat treatment process is avoided, the production period is greatly shortened, andthe procedure cost is reduced; the problem that due to the fac that the strength and plasticity of martensitic wear-resistant steel are not matched, cracks are likely to be generated is solved, and the use safety and high efficiency of the wear-resistant steel are improved; and high market competitiveness and wide application prospects are achieved, and the economic benefits and the social benefits are obvious.

Description

technical field [0001] The invention relates to the technical field of iron and steel materials, in particular to a HB460MPa high-strength, high-toughness fire-cut crack-resistant wear-resistant steel and a production method thereof. Background technique [0002] At present, the wear-resistant materials that can be used are divided into three categories: metals and metal compounds, ceramics and their composite materials, and plastics, among which metal wear-resistant materials still dominate. Our country consumes more than 3 million tons of metal wear-resistant materials every year. 80% of metal materials fail due to wear and tear, so solving wear and prolonging the service life of mechanical equipment and its components has become the primary issue that industry people need to consider when designing, manufacturing and using various mechanical equipment. [0003] The structure of alloy martensitic wear-resistant steel is mainly composed of martensite, which is alloyed with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18C21D6/00C21D8/02C21D9/00C22C38/02C22C38/04C22C38/06C22C38/22C22C38/26C22C38/28C22C38/32C22C38/38
CPCC21D1/18C21D6/002C21D6/005C21D6/008C21D8/0221C21D9/0081C21D2211/008C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/22C22C38/26C22C38/28C22C38/32C22C38/38
Inventor 李德发官计生艾兵余宏伟鲍海燕余爱华
Owner WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
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