A kind of super wear-resistant steel with hardness ≥ 400hbw and its production method

Abstract

Super wear-resistant steel with hardness not smaller than 400 HBW is prepared from, by weight percent, 0.10%-1.00% of C, 1.5%-3.5% of Si, 0.2%-0.8% of Mn, 0.20%-0.35% of Ti and 3.0%-8.0% of Cr. According to the production steps, a casting blank is heated after being formed through conventional smelting and pouring; double-pass high-pressure descaling is conducted till the surface is clean; hot rolling is conducted, and single-piece rolling is adopted; two-segment type cooling is adopted; and pit cooling is conducted till the room temperature. According to the super wear-resistant steel, by obtaining the metallographic structure of tempered martensite and ferrite, the brinell hardness can be larger than 400 HBW; and the corrosion rate does not exceed 0.04 mm / a under seawater soaking.

Description

Technical field [0001] The invention relates to a wear-resistant steel and a production method thereof, in particular to a super wear-resistant steel with a hardness of ≥400HBW and a production method. Background technique [0002] At present, some structural parts in non-road mining machinery and construction machinery require steel plates with excellent wear resistance due to the harsh long-term working environment. Therefore, it is imperative to research a super wear-resistant material with a hardness of ≥400HBW. [0003] In addition to low-alloy, the wear-resistant materials currently used in China mainly include high-manganese steel and low-alloy cast iron. These two types of materials generally have poor corrosion resistance. The as-cast structure of high manganese steel is usually composed of austenite, carbide and pearlite, and the precipitates are coarse, and the water toughening treatment can not be completely eliminated, which is not conducive to the improvement of mater...

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Problems solved by technology

[0006] The Chinese patent publication number is CN102605272A, which discloses "a low-alloy ultra-high-strength wear-resistant steel and its production method", which not only adds rare earth elements to the steel, but also has a low elongation, that is, the maximum value is only 11 %

Only under the condition of load impact, the effect of phase change induction effect is better. Under the condition of no load impact, it is similar to high manganese steel, and the wear resistance is not high, the corrosion resistance is not outstanding, and the content of Ni element added High, high production cost, not obvious economic benefits

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