Ultrahigh strength abrasion resistant steel and method of preparing the same

Abstract

The invention discloses a superhigh intensity wear-resistant steel and the manufacturing method, which belongs to the manufacturing field of low alloying steels, according to percentage by weight, the chemical components of the steel are that C 0.10-0.17%, Si 0.25-0.50%, Mn 1.20-1.50%, P<=0.018%, S<=0.008%, Cr 0.20-0.05%, Ni0.25-0.50%, Mo 0.10-0.40%, Als 0.02-0.06%, B<=0.005%, RE<=150g / t, and the allowance is Fe and unavoidable impurities, and the content of carbon is Ceq(%)<=0.60, Ceq(5)=C+Mn / 6+(Mo+Cr+V) / 5+(Ni+Cu) / 15. The specific method for producing the steel comprises the following steps: smelting ultra-pure steel, desulfurizing molten iron, compounding and converting the top and the bottom of a converter, doing vacuum treatment, feeding rare earth (RE) silk through a crystallizer, casting into bar plates, heating the bar plates, roughing, planishing, air cooling or feeding middle pressure, water cooling, quenching and tempering steel plates. V does not contain in the chemical components of the steel, inner stress of steel is low, steel welding property is improved, and steel has excellent abrasion resistance and ultra-high strength and toughness properties, which is beneficial for popularization and application.

Description

technical field [0001] The invention relates to the field of low-alloy steel manufacturing, in particular to a high-strength wear-resistant steel with excellent strength and toughness matching and high wear resistance and a production method thereof. Background technique [0002] The high-strength wear-resistant steel used for wear-resistant parts in the construction machinery industry requires a high hardness value to ensure the friction and wear resistance under harsh working conditions. The chemical composition of the steel plate usually contains high Cr and V, and quenching is generally used. Process production, so the internal stress is large and the welding performance is poor. [0003] Before the present invention, the WZB-NM360 steel produced by Wuyang Iron and Steel Co., Ltd. had the composition range of: C 0.17~0.21%, Si≤1.90%, Mn≤2.1%, Cr≤0.80%, Mo≤0.60%, V≤0.09 %; The steel adopts the rolling + tempering production process, the production process is relatively s...

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Problems solved by technology

[0005] The present invention aims at that the chemical composition of the existing wear-resistant steel usually contains relatively high Cr and V, the wear resistance and welding performance are poor, and the quenching production process is usually adopted, the internal stress of the steel is large, and the actual use temperature range is limited. The disadvantage of exceeding 300°C provides an ultra-high-strength wear-resistant steel and its production method. The chemical composition of this steel does not contain V, and it is treated by quenching + 500°C tempering, and the composition is simplified and tempered at a higher temperature. , reduce the internal stress of the steel, improve the welding performance of the steel, and make the steel have excellent wear resistance and high strength and toughness

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