Wearable steel plate with low cost and high strength and producing method thereof

Abstract

The invention provides a wearable steel plate with low cost and high strength and a producing method thereof. The mass percentage of chemical components of the steel plate are that: C is 0.13-0.20%, Si is 0.15-0.40%, Mn is 0.8-1.50%, P is not more than 0.02%, Cr is 0.10-0.50%, Al is 0.02-0.06%, Ti is 0.005-0.02%, B is 0.0010-0.0020%, and the residue is Fe and inevitable impurities. The producing method for the steel comprises the following steps of highly cleaning steel melting-molten iron desulfuration-converter top-bottom composite blowing-vacuum treatment-blank casting; especially, the technique parameters in the process of slab heating, rolling and heat treatment can be reasonably controlled; the maximum thickness of the made steel plate is 80mm, the Brinell hardness is 370-430 and the hardness is uniformly distributed. The chemical components of the steel contain no precious alloy elements such as Nb, V, Mo and Ni, etc; the steel has low content of alloy, low cost, good roughness, good wearable performance and welding performance; the steel is widely applied for severe working conditions and the mine and the engineering machinery product with high performance requirement on the steel.

Description

technical field [0001] The invention relates to a low-alloy high-strength wear-resistant steel plate for construction machinery, in particular to a low-cost high-strength wear-resistant steel plate with excellent comprehensive performance and a production 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 under particularly harsh working conditions. Such as bulldozers, loaders, excavators, dump trucks and various mining machinery, grab buckets, stackers and reclaimers, feeding bending structures, etc. Therefore, this kind of wear-resistant steel plate requires high hardness, and at the same time, it must have certain ductility and good welding performance. The current domestic wear-resistant steel generally has a high alloy content. Although it can me...

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Problems solved by technology

However, the steel contains high precious metal elements such as Ni and Mo, and the cost is relatively high.

[0004] There are also patents of "a high-strength wear-resistant plate and its preparation method" and "a quenched and tempered wear-resistant steel and its heat treatment method" invented by Wuyang Iron and Steel Company. The components are: C0.12-0.16%, Si 0.10-0.70%, Mn 0.90-1.50%, P≤0.020%, S≤0.010%, Cr0.20-0.70%, Ni 0.05-0.30%, V 0.03-0.08%, Nb 0.01-0.06%, Mo0.10- 0.50%, Ti 0.01-0.06%, Al 0.02-0.08%, B 0.0005-0.0030% and C0.14-0.18%, Si 0.20-0.40%, Mn 1.20-1.40%, P≤0.015%, S≤0.005%, Cr0.50-0.70%, Ni 0.40-0.55%, V 0.03-0.08%, Nb 0.02-0.03%, Ti0.015-0.030%, Mo 0.40-0.50%, Al 0.02-0.045%, B 0.0015-0.0030%; The ingredients of the two patents are added with different contents of precious metal elements such as Nb, Ni, Mo, V, etc., which greatly increases the production cost

The second patent also contains Cu, and the cost of both patents is relatively high

The tempering temperature of the first patent is 150-250°C, which belongs to low-temperature tempering. The normal industrial tempering temperature is 400-700°C. Production organization and control are difficult in mass industrial production, which greatly affects the normal operation of the heat treatment furnace. Production

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