High strength low alloy wear resistance steel plate and preparation method thereof

Abstract

The invention relates to high strength low alloy wear resistance steel plate and a preparation method thereof. The steel comprises the following chemical compositions by weight percent: 0.18-0.22% of C, 0.2-0.5% of Si, 1.0-1.6% of Mn, 0.010% or less of P, 0.005% or less of S, 0.02-0.03% of Al, 0.016-0.022% of Ti, 0.16-0.20% of Cr, 0.0005-0.0015% of B and the balance Fe and inevitable impurities. The carbon equivalent (Ceq) is equal to 0.5% or less than 0.5%, while Ceq (%) = C + Mn / 6 + Si / 24 + Ni / 40+ Cr / 5 + Mo / 4 + V / 14. The preparation method of the steel plate comprises the process of preparing ultra-pure steel, and the preparation method is characterized in that the specific parameters are controlled as follows: the plate blank is heated to the temperature range of 1180-1200 DEG C, the heating time is not less than 150min; the screw-down rate for rolling each pass is 15-30%, the accumulated screw-down rate is not less than 70%, the starting temperature of hot rolling is 1050-1100 DEG C, the finishing temperature is above 950 DEG C; and the heat treatment is performed after the steel plate is rolled and the heat treatment comprises quenching and low temperature tempering steps, wherein the quenching conditions are that the steel plate is heated to the temperature range of 910-950 DEG C and the holding time is 3min / mm and the tempering conditions are that the steel plate is heated to 250 DEG C and the holding time is 2.5min / mm. The method of the invention can increase the wear resistance, welding performance, strength and hardness, simplify production process and reduce cost of steel plates.

Description

technical field [0001] The invention relates to a wear-resistant steel plate for mechanical engineering, in particular to a low-alloy wear-resistant steel plate with high strength, high hardness and reasonable matching of strength and toughness and a manufacturing process thereof. Background technique [0002] At present, the wear-resistant steels used in China mainly include high-manganese steels and medium- and low-alloy wear-resistant steels. The wear resistance of high manganese steel is conditional. Only when the impact is large, the stress is high, and the abrasive is hard, the high manganese steel is wear-resistant, and its yield strength is low and easy to deform. The medium and low alloy wear-resistant steel has excellent strength, toughness, wear resistance and corrosion resistance, and its cost is relatively low compared with other wear-resistant steels, so it is suitable for manufacturing various wear-resistant parts. [0003] Domestically produced medium and lo...

AI Technical Summary

Problems solved by technology

At the same time, some elements such as Cr and V are also added more in the previous wear-resistant steel. For example, the Cr content is usually between 0.3 and 0.8%, which will increase the carbon equivalent of the steel and have a great impact on the welding performance of the steel plate.

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