A kind of wear-resistant steel with excellent surface quality and preparation method thereof

Abstract

The invention relates to a wear-resistant steel with excellent surface quality. The composition is C: 0.12-0.20%, Si: ≤0.1%, Mn: 0.6-1.20%, Nb: 0.010-0.040%, V: ≤0.01%, Ti: 0.010%~0.030, Al: ≤0.04%, Ni: ≤0.1%, Cu: ≤0.1%, Cr: 0.10~0.40%, Mo: ≤0.1%, B: 0.001~0.005%, Ca: 0.0010~0.0050%, P: ≤0.010%, S: ≤0.0015%, O: ≤0.0012%, N: ≤0.0035%, H: ≤0.0002%, the balance is Fe, carbon equivalent CEV≤0.4; PCM≤0.25. The production process is: converter steelmaking->LF refining->VD or RH high vacuum degassing->continuous casting->heating->rolling->shot blasting->quenching->tempering. The wear-resistant steel of the invention has better surface quality, and there are no surface defects such as air pits, inclusions, pockmarks and pressed iron oxide scales. If the depth of mottled spots on the surface caused by the peeling off of iron oxide scale is ≤0.1mm, the surface grinding of the steel plate may not be carried out. On the basis of element design, it can further realize welding without preheating and excellent toughness.

Description

technical field [0001] The invention relates to the technical field of iron-based alloys, in particular to a wear-resistant steel with excellent surface quality and a manufacturing method thereof. Background technique [0002] Wear-resistant steel plates are widely used in construction machinery, mining and transportation, road transportation and other industries that require high strength and good wear resistance for key components of mechanical equipment, such as excavator buckets, scraper conveyor middle grooves, mining dump trucks bucket and so on. In recent years, domestic wear-resistant steel production enterprises have done a lot of work on how to improve the comprehensive mechanical properties of steel plates. For example, the inventions of Chinese patent publication numbers CN104451409A, CN103014543A, CN102747280B, and CN106521314B are based on surface hardness, overall hardness, high toughness, and easy welding. etc. have been reported. [0003] With the further ...

AI Technical Summary

Problems solved by technology

On the one hand, surface defects will become the crack source of various failure cracks; on the other hand, it will affect the appearance of equipment

Steel plate manufacturers adopt partial grinding to deal with surface defects without affecting the thickness of the steel plate, but this will have a great impact on the painting of the surface of the equipment in the later stage, resulting in uneven paint film and greatly affecting the surface quality

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