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一、前言 抚顺钢厂生产的40Cr钢的性能,过去比较稳定,但在74年底有几炉钢的冲击韧性特别低,不合出厂要求。提高回火温度接近上限仍未见效。一般金相观察未能确定引起a_k急剧降低的原因。钢的组织是高温回火索氏体。
I. Foreword The performance of 40Cr steel produced by Fushun Steel was relatively stable in the past. However, the impact toughness of several furnaces was particularly low at the end of 74, which was inconsistent with the requirements of the factory. Increasing the tempering temperature is still not effective. General metallographic observations failed to identify the cause of the sharp decline in a_k. The organization of steel is tempered sorbite.