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对 - 2 0°C低温冲击韧度不合格的 S355J2 G3钢板进行了化学分析、金相检验和力学性能测定。结果表明 ,钢板不合格原因是由于钢在加热时奥氏体化温度过低造成的。
The chemical analysis, metallographic examination and mechanical properties of S355J2 G3 steel plate with unacceptable low temperature impact toughness at -20 ° C were carried out. The results show that the reason for the failure of the steel plate is due to the austenitizing temperature of the steel during heating is too low.