Importance

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Abstract

Disclosed in the present disclosure is a steel. Apart from 90% or more by mass Fe and inevitable impurities, the steel further contains the following chemical elements in percentage by mass: C: 0.22-0.33%, Si: 0.1-1.0%, Mn: 0.3-1.5%, Cr: 0.2-1.6%, Ni: 2.2-3.8%, Mo: 0.1-0.7%, Cu: 0.02-0.3%, Al: 0.01-0.045%, V: 0.01-0.25%, and N≤0.013%. Further disclosed in the present disclosure is a method for manufacturing the steel, comprising: (1) smelting and casting; (2) forging or rolling, involving processing a casting blank to a finished product size by using a roll-in-one-heat process or roll-in-two-heat process; and (3) quenching and tempering: wherein the heating temperature of quenching is 860-1000° C., the holding time is 2-6 h, and water cooling is performed after the quenching; and the tempering temperature is 400-600° C., the holding time is 1-4 h, and air cooling to room temperature is performed after tempering. The steel of the present disclosure has high strength, well matched toughness and plasticity, and good weather resistance, thereby having good application prospects.

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First Claim