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A kind of Brinell hardness 400 grade wear-resistant steel and its manufacturing method

A technology of Brinell hardness and manufacturing method, which is applied in the field of iron and steel manufacturing, can solve the problems of poor uniformity, cracking of steel plates, large residual stress, etc., and achieve the effect of fully dissolving, reducing cracking tendency, and uniform residual stress

Active Publication Date: 2017-11-17
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • A kind of Brinell hardness 400 grade wear-resistant steel and its manufacturing method
  • A kind of Brinell hardness 400 grade wear-resistant steel and its manufacturing method
  • A kind of Brinell hardness 400 grade wear-resistant steel and its manufacturing method

Examples

Experimental program
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Effect test

Embodiment 1

[0034] A wear-resistant steel of Brinell hardness 400 grade with a thickness of 30mm, its chemical composition by mass percentage is: C0.18%, Si 0.25%, Mn 1.05%, P 0.014%, S≤0.005%, Cr 0.78%, Ni 0.07%, Mo0.31%, Als 0.038%, Ti 0.024%, V 0.013%, B 0.002, and the rest are iron and unavoidable impurities.

[0035] Carry out vacuum smelting and casting into slabs according to the proportioned chemical composition, heat the slab at a high temperature of 1200°C for 240 minutes; Roll the slab with a reduction rate greater than 20%; then cool it; quench the cooled plate at a high temperature of 870°C and keep it for 30 minutes; temper the quenched plate at a low temperature of 190°C and keep it for 100 minutes to complete the wear-resistant steel. make. Table 1 and Table 2 are respectively the mechanical properties and surface residual stress analysis table of the wear-resistant steel with a Brinell hardness of 400 and a thickness of 30 mm prepared by the above method.

[0036] Table...

Embodiment 2

[0041] A wear-resistant steel of Brinell hardness 400 grade with a thickness of 20mm, its chemical composition by mass percentage is: C0.19%, Si 0.31%, Mn 1.2%, P 0.013%, S≤0.005%, Cr 0.68%, Ni 0.07%, Mo 0.29%, Als 0.032%, Ti 0.026%, V 0.017%, B 0.002, and the rest are iron and unavoidable impurities.

[0042] Carry out vacuum smelting and casting into slabs according to the chemical composition of the ratio, and soak the slab at 1200°C for 160 minutes; roll the heated slab at a starting temperature of 1060°C and a final rolling temperature of 980°C , the single-pass reduction rate is greater than 20%; cooling; quenching the cooled plate at a high temperature of 870°C and holding it for 20 minutes; tempering the quenched plate at a low temperature of 190°C and holding it for 70 minutes to complete the production of wear-resistant steel.

[0043] Table 3 and Table 4 are respectively the mechanical properties table and the surface residual stress analysis table of the 20 mm thic...

Embodiment 3

[0049] A wear-resistant steel of Brinell hardness 400 grade with a thickness of 25mm, its chemical composition by mass percentage is: C0.17%, Si 0.31%, Mn 0.9%, P 0.013%, S≤0.008%, Cr 0.68%, Ni 0.07%, Mo 0.29%, Als 0.032%, Ti 0.026%, V 0.017%, B 0.002, and the rest are iron and unavoidable impurities.

[0050] Carry out vacuum smelting and casting into slabs according to the chemical composition according to the ratio. The slab is soaked at 1250°C for 200 minutes; the heated slab is rolled with a starting temperature of 1200°C and a final rolling temperature of 980°C. , the single-pass reduction rate is greater than 30%; cooling; quenching the cooled plate at a high temperature of 870°C and holding it for 50 minutes; tempering the quenched plate at a low temperature of 190°C and holding it for 100 minutes to complete the production of wear-resistant steel.

[0051] Table 5 and Table 6 are the mechanical properties table and surface residual stress analysis table of the wear-re...

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Abstract

The invention discloses wear-resistant steel with 400-level Brinell hardness and a manufacturing method thereof. The steel comprises, by mass, 0.14-0.21% of C, 0.20-0.40% of Si, 0.9-1.4% of Mn, 0.015% of P or less, 0.008% of S or less, 0.5-0.8% of Cr, 0.05-0.08% of Ni, 0.2-0.4% of Mo, 0.02-0.05% of Als, 0.02-0.03% of Ti, 0.02% of V or less, 0.005% of B or less, and the balance iron and inevitable impurities. The manufacturing method includes the following steps that the chemical components are proportionally subjected to vacuum melting and cast into blanks, and then plate blank heating, rolling, cooling, quenching and low-temperature tempering are performed to obtain finished steel plates. The wear-resistant steel is good in residual stress uniformity, free of cracking or deformation in the use process, resistant to wear and long in service life.

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 400 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): C22C38/54C22C38/50C21D8/02
Inventor 薛欢余立吴立新马玉喜陈士华欧阳珉路刘冬杜丽影
Owner 武汉钢铁有限公司
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