Wear-resistant steel with good forming performance for dumper carriage body and production method thereof

Abstract

The invention discloses wear-resistant steel with good forming performance for a dumper carriage body. Weight percentages of chemical components of the wear-resistant steel are as follows, 0.16-0.22%of C; 0.15-0.35% of Si; 0.90-1.30% of Mn; less than or equal to 0.018% of P, less than or equal to 0.010% of S, 0.020-0.060% of Als; 0.020-0.060% of Nb; 0.012-0.028% of Ti, 0.30-0.70% of Cr, 0.10-0.20% of Mo, 0.0005-0.0018% of B, less than or equal to 0.0025% of O, less than or equal to 0.0050% of N, less than or equal to 1.8 ppm of H and the balance of Fe and inevitable impurities. In the production method, the controlled rolling process comprises the rough rolling process, and austenite recrystallization zone deformed austenite grain uniformity control is carried out in the rough rolling process, and the pass reduction rate is controlled to gradually increase. The wear-resistant steel is advantaged in that the microstructure of the base plate is mainly composed of fine lath martensite, martensite lath size and mechanical property through plate distribution are uniform, a steel plate uniformly extends in all directions during stretching, cutting and U-shaped bending, consistency of machining and forming is guaranteed, straightness of the steel plate ranges from 1 mm / 2 m to 4 mm / 2 m after the steel plate is cut into narrow strips, straightness of a bent end is not larger than 3 mmafter the steel plate is bent in a U shape, and good forming performance is achieved.

Description

technical field [0001] The invention relates to a wear-resistant steel and a production method thereof, in particular to a wear-resistant steel for a dump car body with good formability and a production method thereof. Background technique [0002] China's special-purpose vehicle market is developing rapidly. Compared with European standards, the weight of Chinese special-purpose vehicles is 17% higher on average, which means more fuel consumption, more CO 2 emissions and lower loads, and the key to solving these problems lies in the application and process of new materials. Through light weight, vehicles can save fuel by 25%~37%. At present, multi-material body structure design has become a development trend. By optimizing the body structure, it can not only improve vehicle performance but also significantly reduce its own weight. At present, high-strength steel, wear-resistant steel and aluminum have become the main materials, emphasizing the use of suitable materials for...

AI Technical Summary

Problems solved by technology

[0004] In the process of manufacturing wear-resistant steel substrates into dump truck compartments, it usually goes through processes such as "cutting", "U-shaped bending", "opening", and "welding". Among them, "cutting", "U-shaped bending" When bending, high-strength wear-resistant steel plates often appear secondary bending deformation, or U-shaped bending deformation is inconsistent, resulting in inconsistent flatness and size.

The thickness of the steel plate with secondary bending deformation or inconsistent U-bending deformation is usually ≤16mm, especially the wear-resistant steel products of thin-sized dump truck body with a tensile strength of 1200MPa and above. The straightness of the narrow steel plate after warping even reaches 15mm / 2m~25mm / 2m. After the U-shaped bending of the box body, the straightness of the bending end even reaches more than 10mm, which is almost regarded as a product with unqualified forming performance. , which has brought great troubles to companies that use thin-gauge wear-resistant steel to manufacture dump truck compartments and to manufacturers of wear-resistant steel substrates

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