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

Abstract

The invention relates to a low-alloy high-toughness wear resistant steel plate and a manufacturing method thereof. The steel plate contains the following chemical components (wt%): C: 0.08-0.20%, Si: 0.10-0.60%, Mn: 1.00-2.00%, B: 0.0005-0.0040%, Cr<=1.50%, Mo<=0.80%, Ni<=1.50%, Nb<=0.080%, V<=0.080%, Ti<=0.060%, Al: 0.010-0.080%, Ca: 0.0010-0.0080%, N<=0.0080%, O<=0.0080%, H<=0.0004%, P<=0.0015% and S<=0.010%, wherein the following relationships are satisfied: 0.20%<=(Cr / 5+Mn / 6+50 B)<=0.55%, 0.02%<=(Mo / 3+Ni / 5+2Nb)<=0.45%, and 0.01%<=(Al+Ti)<=0.13%; and the balance of Fe and inevitable impurities. The contents of both carbon and alloy elements are reduced, the characteristics of refining, strengthening and the like of micro-alloy elements such as Nb and Ti are fully utilized, and a TMCP (thermal mechanical control processing) technology is adopted, so that the wear resistant steel plate is high in hardness, good in toughness, easy to weld, perfect in wear resistance, and applicable to easily-worn components in various types of mechanical equipment.

Description

technical field [0001] The invention relates to wear-resistant steel, in particular to a low-alloy high-toughness wear-resistant steel plate and its manufacturing method; its typical mechanical properties: its tensile strength is greater than 1200MPa, its elongation is greater than 12%, and its Brinell hardness is greater than 400HB, -40 ℃ Charpy V-type longitudinal impact energy greater than 60J. 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 martensi...

AI Technical Summary

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; wear-resistant steel produced by rolling can further reduce alloy However, it is still not suitable for wide application; off-line quenching + tempering heat treatment is the most important production method of wear-resistant steel plates at present. It has fewer alloy elements and higher product performance, which can stabilize industrial production. With low-carbon, energy-saving, environmental protection and other requirements getting higher and higher, low-cost, short-process, low-alloy and high-toughness 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, which is produced by casting process, and its carbon and alloy elements (Cr, Mo, etc.) are high in content, which will inevitably lead to poor welding performance and machining performance

[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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