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Brinell hardness 450 grade wear-resistant steel and manufacturing method thereof

A technology of Brinell hardness and manufacturing method, applied in the field of iron and steel manufacturing, can solve the problems of small tensile stress or stress value, cracking and deformation of steel plates, large residual stress, etc., so as to improve the service life, inhibit cracking, and have good wear resistance. Effect

Active Publication Date: 2019-01-22
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the general wear-resistant steel has a high hardness value, large internal residual stress, and poor uniformity. It is easy to crack the steel plate during use; in addition, the residual stress on the surface has a certain relationship with the wear resistance. If it is compressive stress, it can improve the wear resistance and fatigue performance of the steel plate
[0004] The residual stress of the existing Brinell hardness 450 wear-resistant steel is tensile stress or the stress value is small, the uniformity is not good, the steel plate is prone to cracking and deformation during use, and the shortcomings of poor welding performance

Method used

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  • Brinell hardness 450 grade wear-resistant steel and manufacturing method thereof
  • Brinell hardness 450 grade wear-resistant steel and manufacturing method thereof
  • Brinell hardness 450 grade wear-resistant steel and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A wear-resistant steel of Brinell hardness 450 grade with a thickness of 30mm, its chemical composition by weight percentage is: C0.20%, Si 0.51%, Mn 1.43%, P 0.007%, S 0.002%, Cr 0.70%, Ni 0.05 %, Mo0.026%, Als 0.031%, Ti 0.011%, V 0.008%, B 0.002%, and the rest are iron and unavoidable impurities.

[0029] Carry out the following steps in order according to the chemical composition of the ratio: smelting by ultra-pure steel process → hot metal desulfurization → converter top-bottom composite blowing → vacuum treatment → continuous casting into slab → slab heating → rolling → cooling → quenching → low temperature tempering → finished steel plate,

[0030] In the slab heating stage, the soaking temperature is 1250°C, the heating rate is 11min / cm, and the heating is 300min;

[0031] In the rolling step, the slab is rolled with a starting rolling temperature of 1060°C, a finishing rolling temperature of 1080°C, and a single pass reduction greater than 30%;

[0032] In t...

Embodiment 2

[0041] A wear-resistant steel of Brinell hardness 450 grade with a thickness of 40mm, its chemical composition by weight percentage is: C0.19%, Si 0.44%, Mn 1.25%, P 0.01%, S 0.001%, Cr 0.68%, Ni 0.06 %, Mo 0.08%, Als 0.025%, Ti 0.001%, V 0.015%, B 0.002%, and the rest are iron and unavoidable impurities.

[0042] Carry out the following steps in order according to the chemical composition of the ratio: smelting by ultra-pure steel process → hot metal desulfurization → converter top-bottom composite blowing → vacuum treatment → continuous casting into slab → slab heating → rolling → cooling → quenching → low temperature tempering → finished steel plate,

[0043] In the slab heating stage, the soaking temperature is 1230°C, the heating rate is 10.5min / cm, and the heating is 400min;

[0044] In the rolling step, the slab is rolled with a starting rolling temperature of 1300°C, a finishing rolling temperature of 1010°C, and a single pass reduction greater than 40%;

[0045] In ...

Embodiment 3

[0053] A wear-resistant steel of Brinell hardness 450 grade with a thickness of 20mm, its chemical composition by weight percentage is: C0.17%, Si 0.58%, Mn 1.45%, P 0.003%, S 0.004%, Cr 0.85%, Ni 0.09 %, Mo0.046%, Als 0.043%, Ti 0.01%, V 0.018%, B 0.003%, and the rest are iron and unavoidable impurities.

[0054] Carry out the following steps in order according to the chemical composition of the ratio: smelting by ultra-pure steel process → hot metal desulfurization → converter top-bottom composite blowing → vacuum treatment → continuous casting into slab → slab heating → rolling → cooling → quenching → low temperature tempering → finished steel plate,

[0055] Slab heating stage: the soaking temperature is 1190°C, the heating rate is 10.1min / cm, and the heating time is 220min;

[0056] In the rolling stage, the starting rolling temperature is 1550°C, the final rolling temperature is 1100°C, and the single-pass reduction rate is greater than 22%;

[0057] The quenching temp...

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Abstract

The invention relates to Brinell hardness 450-level abrasion-resistant steel. The steel comprises, by weight, 0.17%-0.22% of C, 0.40%-0.60% of Si, 1.2%-1.45% of Mn, 0-0.01% of P, 0-0.005% of S, 0.6%-0.85% of Cr, 0-0.1% of Ni, 0-0.1% of Mo, 0.02%-0.05% of Als, 0-0.015% of Ti, 0-0.02% of V, 0-0.004% of B, and the balance Fe and inevitable impurities. The invention further provides a manufacturing method of the Brinell hardness 450-level abrasion-resistant steel. By the adoption of the manufacturing method, the abrasion-resistant steel has good abrasion resistance and high toughness, and meanwhile even pressure stress is achieved on the surface of the abrasion-resistant steel, so that the abrasion resistance and anti-fatigue performance are further enhanced. The abrasion-resistant steel is good in residual stress homogeneity, cracking and deformation cannot happen in the using process, abrasion resistance is achieved, and the service life is long.

Description

technical field [0001] The invention belongs to the field of iron and steel manufacturing, and in particular relates to a wear-resistant steel with a Brinell hardness of 450 and a manufacturing method thereof. Background technique [0002] Wear-resistant steel is a type of steel material widely used in various wear conditions. Its purpose is to slow down the wear and tear of mechanical parts, improve the life of products, and prolong the time for mechanical products to fail due to wear. It requires high The hardness value to ensure the friction and wear resistance under severe working conditions. [0003] Residual stress is a key parameter affecting the use of wear-resistant steel, which is directly related to the cracking of the steel plate and the wear resistance of the surface. However, the general wear-resistant steel has a high hardness value, large internal residual stress, and poor uniformity. It is easy to crack the steel plate during use; in addition, the residual ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/18C22C38/08C22C38/12C22C38/06C22C38/14C22C38/32C21D8/02C21D1/18C21D6/00
CPCC21D1/18C21D6/005C21D8/0226C21D8/0247C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/18C22C38/32
Inventor 薛欢马玉喜葛锐余立吴立新彭文杰邝兰翔
Owner 武汉钢铁有限公司
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