Low-alloy high-hardness wear-resistant steel plate and manufacturing method thereof

Abstract

The present invention provides a low-alloy high-hardness wear-resistant steel plate and a manufacturing method thereof. The steel plate comprises the following chemical compositions (wt%) of 0.33-0.45% of C, 0.10-0.50% of Si, 0.50-1.50% of Mn, 0.0005-0.0040% of B, 0-1.50% of Cr, 0-0.80% of Mo, 0-2.00% of Ni, 0-0.080% of Nb, 0-0.080% of V, 0-0.060% of Ti, 0-0.10% of RE, 0-1.00% of W, 0.010-0.080% of Al, 0.0010-0.0080% of Ca, 0-0.0080% of N, 0-0.0080% of O, 0-0.0004% of H, 0-0.015% of P, and 0-0.010% of S, wherein the following relationships are satisfied: 0.20%<=(Cr / 5+Mn / 6+50B)<=0.55%, 0.02%<=(Mo / 3+Ni / 5+2Nb)<=0.50%, 0.01%<=(Al+Ti)<=0.13%, and the balance is Fe and inevitable impurities. The steel plate manufactured by the above compositions and through various heat treatment processes has high hardness and excellent wear resistance, and is suitable for easy-to-wear parts in various mechanical equipments.

Description

technical field [0001] The invention relates to wear-resistant steel, in particular to a low-alloy high-hardness wear-resistant steel plate and a manufacturing method thereof; its typical mechanical properties: hardness greater than 550HB, Charpy V-type longitudinal impact energy greater than 40J at -40°C. Background technique [0002] Wear-resistant steel plates are widely used in mechanical products such as engineering, mining, agriculture, cement production, ports, electric power and metallurgy that require high strength and high wear resistance due to extremely harsh working conditions. Such as bulldozers, loaders, excavators, dump trucks and grabs, stackers and reclaimers, feeding bending structures, etc. [0003] Traditionally, austenitic high manganese steel is generally used to produce wear-resistant parts. Austenitic high-manganese steel can undergo strain-induced martensitic transformation under large impact loads to improve its wear resistance. Austenitic high-m...

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Problems solved by technology

The production of wear-resistant steel by casting has short production process, simple process and easy production, but there are disadvantages such as high alloy element content, poor mechanical, welding and machining performance; production of wear-resistant steel by rolling can further reduce alloy elements content, improve product performance, but still not suitable for wide application; off-line quenching + tempering heat treatment is the most important production method of wear-resistant steel plate at present, its alloy elements are less, product performance is high, and can stabilize industrial production, but with low Carbon, energy saving, environmental protection and other requirements are getting higher and higher, and low-cost, short-process, high-performance products are the inevitable trend of the development of the steel industry

[0005] Chinese patent CN1140205A discloses a medium-high-carbon medium-alloy wear-resistant steel with high content of carbon and alloy elements (Cr, Mo, etc.), which is produced by casting process, which will inevitably lead to poor mechanical properties and welding properties

[0006] Chinese patent CN1865481A discloses a bainitic wear-resistant steel with high carbon and alloy elements (Si, Mn, Cr, Mo, etc.) content and poor welding performance; Tensitic wear-resistant steel, low mechanical properties

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