热处理工艺对5mm 9Ni钢板性能的影响

Effect of Heat Treatment Process on Properties of 9Ni Steel 5 mm Plate

研究了淬火+亚温淬火+回火(QLT)、淬火+回火(QT)、正火+正火+回火(NNT)3种工艺对5 mm9Ni钢板低温韧性的影响。结果表明,采用NNT工艺,钢板低温韧性良好,逆变奥氏体含量8.0%;通过工艺试制,5mm 9Ni钢板,采用3.3 mm厚度规格试样,-196℃冲击吸收能量≥40 J;采用2.5 mm厚度规格试样,-196℃冲击吸收能量≥27 J。

The effect of three kinds of process quenching+lamellarizing(quenching from intercritical temperature)+tempering(QLT),quenching+tempering(QT),double normalizing+tempering(NNT)on low temperature toughness of5 mm 9 Ni steel plate has been studied.The results show that the steel plate with NNT has good ductility at low temperature,good plate shape and 8.0%reverse austenite content by using double normalizing and tempering process.Through industrial trial production,the-196℃charpy absorption energy of 5 mm 9 Ni steel plate with 3.3 mm thickness specimen is≥40 J;and that with the 2.5 mm thickness specimen is≥27 J.