A kind of low-temperature semi-hardened wear-resistant steel with a Brinell hardness of 400hb and its production method

Abstract

The invention discloses a low-temperature semi-quenched and wear-resistant steel with the brinell hardness of 400 HB. The low-temperature semi-quenched and wear-resistant steel with the brinell hardness of 400 HB is prepared from the following components of, in percentage by weight, 0.08%-0.25% of C, 0.30%-0.50% of Si, 0.5%-1.0% of Mn, less than or equal to 0.01% of P, less than or equal to 0.005%of S, 0.60%-0.80% of Cr, 0.03%-0.05% of Al, 0.01%-0.02% of Ti, 0.02%-0.03% of Nb and 0.001%-0.004% of B; the production method comprises the following steps of performing RH vacuum treatment after conventional converter combined blowing and LHF furnace treatment; heating a casting blank; performing rough rolling; carrying out finish rolling; quenching; tempering at low temperature; and finishingfor later use. On the premise of ensuring the hardness value, a relatively soft bainite or sorbite metallographic structure is obtained at the core part of the steel plate, the surface of the steel plate is tempered martensite metallographic structure, so that the brinell hardness of the surface of the steel plate is greater than 400HBW, and the production cost is reduced by at least 10% comparedwith that of the prior art due to the addition of the alloy elements.

Description

technical field [0001] The invention relates to a wear-resistant steel and a production method thereof, in particular to a low-temperature semi-hardened wear-resistant steel with a Brinell hardness ≥ 400HB and a production 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 us...

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Problems solved by technology

2. There is no subdivision of the use function of wear-resistant steel

At the same time, there are some wear-resistant steels that only bear the friction loss and do not bear the responsibility of structural loads (such as the scraper of the coal excavator). The main function of this type of wear-resistant steel is to resist friction loss, and it is multi-purpose For the parts that can be disassembled flexibly, steel plate users will replace the steel plate when the steel plate wears 2-3mm, and the replaced steel plate will be scrapped. At present, the wear-resistant steel has not been subdivided according to the use characteristics of the steel plate. Downstream manufacturers purchase The fully hardened wear-resistant steel plate will also be uniformly purchased. In fact, when the fully hardened steel plate is used in the position of non-structural parts, it actually only exerts less than 30% of the use value of the steel plate, which is very uneconomical.

For the production of steel plates, more energy consumption and alloys are required, resulting in great waste

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