Wear resistant steel plate

Abstract

The invention provides a wear resistance steel plate, which contains the chemical ingredients (by weight percent) of: 0.31 to 0.40% of C, 0.10 to 0.80% of Si, 0.20 to 1.50% of Mn, not more than 0.050% of P, not more than 0.030% of S, 0 to 1.50% of Cr, 0 to 0.80% of Mo, 0.02 to 0.20% of Al, 0.0005 to 0.0040% of B, 0 to 0.10% of Ti, 0 to 0.030% of Ca, the balance of Fe and unavoidable impurities, wherein Cr+Mo is not less than 0.10% and not more than 1.80%, and Al+Ti not less than 0.05% and not more than 0.18%. A manufacturing method of the wear resistance steel plate comprises the steps of smelting, refining, casting, rolling, quenching, tempering and the like. The 550 HB-level wear resistance steel plate, which is obtained from the ingredients and process, has high hardness (not less than550 HB), can be welded and bent, and includes the microstructure of martensite or martensite and residual austenite. The steel plate has superior wear resistance and is extremely suitable for workingunder strong wear environment, especially on vehicles or facilities, like buckets, loaders, mining electric wheel dump tracks and the like, which come into contact with high-hardness materials, such as high strength ore and the like.

Description

technical field [0001] The invention relates to wear-resistant steel, in particular to a 550HB wear-resistant steel plate and a manufacturing method thereof. Background technique [0002] Wear-resistant steel plates are widely used in mechanical products such as engineering, mining, construction, 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 various mining machinery, grab buckets, stackers and reclaimers, feeding bending structures, etc. [0003] At present, the hardness of low-alloy high-strength wear-resistant steel is generally 300HB to 500HB. However, for particularly harsh working conditions, especially when in contact with high-hardness rocks, mineral materials, etc., low-grade wear-resistant steel plates can no longer meet the requirements for use, and stronger, higher-hardness wear-resistant st...

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Problems solved by technology

[0007] There are introductions about wear-resistant steel in the prior art. For example, French patent FR2847272 discloses a wear-resistant steel whose chemical composition is C: 0.24-0.35%, Si: 0-2%, Mn: 0-2.5%, S : ≤0.15%, Cr: 0~5%, Mo: 0~1%, Ni: 0~5%, Cu: 0~1.5%, B: 0~0.02%, Al: 0~2%, Ti: 0 ~1.1%, N<0.03%, W: 0~2%, Zr: 0~2.2%, the carbon content of this wear-resistant steel is relatively low, and the composition is relatively complex

European patent EP 1563104 discloses a wear-resistant steel plate, the chemical composition of which is C: 0.35-0.8%, Si: 0-2.0%, Mn: 0-2.5%, S: ≤0.15%, Cr: 0-5%, Mo: 0-0.05%, Ni: 0-5%, Cu: 0-1.5%, B: 0-0.02%, Al: 0-2%, Ti: 0-1.1%, N<0.03%, W: 0 ~1%, Zr: 0~4%, the wear-resistant steel is a composition system with high carbon content and the composition is relatively complex

The publication numbers are CN1132264, CN1775983, CN1189542, CN1385549 and CN1132263 Chinese patent applications are high silicon, high manganese composition system, and contain more alloy elements, not suitable for welding, which limits the wide application of wear-resistant steel in industry

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