NM400-level anti-crack high-strength wear-resistant steel and production method thereof

Abstract

The invention relates to NM400-level anti-crack high-strength wear-resistant steel. The NM400-level anti-crack high-strength wear-resistant steel comprises the following components in percentage by weight: 0.04-0.08% of C, 0.20-0.50% of Si, 1.20-1.50% of Mn, not more than 0.015% of P, not more than 0.005% of S, 0.25-0.60% of Cr, 0.20-0.50% of Mo, 0.005-0.025% of Ti, 0.001-0.005% of B and 0.015-0.05% of Als. The production steps are as follows: smelting, and performing continuous casting to form a blank; heating the cast blank; rolling; water-rolling; air-cooling to room temperature; and tempering. The NM400-level anti-crack high-strength wear-resistant steel disclosed by the invention has the advantages of low alloy cost, small adding quantity of alloy and excellent welding performance and anti-flame cutting crack sensitivity, and can avoid the energy loss caused by a complex heat treatment process and simultaneously greatly shorten the production period; and in addition to the excellent welding performance and anti-flame cutting crack sensitivity, as the manufacturing process is simple and the flow process is short, the cost can be reduced by 15%, the energy consumption can be reduced by 25%, and the process operability is improved, thus the NM400-level anti-crack high-strength wear-resistant steel has very strong market competitiveness, broad application prospects and obvious economic and social benefits.

Description

technical field [0001] The invention belongs to the field of manufacturing wear-resistant steel for mechanical engineering, and in particular relates to an NM400 crack-resistant high-strength wear-resistant steel and a processing method thereof. Background technique [0002] Wear and tear generally occurs on the friction surface of materials. A large number of statistics show that nearly half of the energy is consumed by wear, and 80% of the material fails due to wear. If coupled with the shutdown of manpower replacement parts, poor quality of mechanical products and low efficiency, economical The losses will be greater. According to statistics, my country consumes more than 3 million tons of metal wear-resistant materials every year. Applying the theory of friction and wear to prevent and reduce friction and wear can save 15 billion US dollars per year. At present, the wear-resistant materials that can be used are divided into three categories: metals and metal compounds, ...

AI Technical Summary

Problems solved by technology

[0006] The Chinese Patent Publication No. CN102605272A discloses a low-alloy ultra-high-strength wear-resistant steel and its production method. The ingot is obtained by die casting, and its composition weight percentage is: C: 0.20~0.35%, Si: 0.3~0.7%, Mn: 0.6~1.0%, Cr: 0.7~1.1%, Ni: 0.6~1.0%, Mo: 0.3~0.7%, the rest is Fe and trace impurity elements, the ingot is forged, and then 900°C~940°C normalizing (holding time 1~3 hours) -880°C~920°C quenching (holding time 1~3 hours) -150°C~220°C low temperature tempering (holding time 2~4 hours) to obtain A steel plate with high strength, high toughness, and high wear resistance. The disadvantage is that the addition of precious alloys Ni, Cr, and Mo is large, the cost of the alloy is still high, the heat treatment process is complicated, and the process c...

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