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我国的合金结构钢GB3077—88,按照P、S及残余元素(Cr、Ni、Cu)的含量水平,分为优质钢、高级优质钢和特级优质钢三个质量等级,这是按前苏联的办法规定的,体现了质量分等分级,有其合理的一面,但又出了另一问题,前不久有某钢厂向我提问,GB3077—88的40CrNiMoA是高级优质钢,标准中没有优质钢等级—40CrNiMo,用户不要带A的等级,此时P、S及残余元素及力学性能应按哪个标准执行?
China’s alloy structural steel GB3077-88, according to the P, S and the residual elements (Cr, Ni, Cu) levels, divided into high quality steel, high quality steel and premium quality steel quality grade, which is according to the former Soviet Union Measures stipulated that reflects the grading of quality, there is a reasonable side, but another problem is that recently a steel mill asked me questions, GB3077-88 40CrNiMoA is a high-quality steel, there is no standard high-quality steel Level -40CrNiMo, the user does not take the A level, then P, S and residual elements and mechanical properties should be according to which standard?