摘要
热轧大口径厚壁无缝碳素钢管的冲击韧性差,在使用过程中容易发生脆断,经过热处理后可以得到改善。对大口径厚壁20钢无缝钢管进行正火热处理后,其晶粒得到细化,从而改善了室温冲击韧性,但低温冲击韧性仍然差。淬火处理后获得了铁素体魏氏组织和珠光体的混合组织,钢管的室温和低温冲击韧性均得到显著改善,同时还具有高的强度。淬火后在650℃下进行回火能够使魏氏组织针片之间析出碳化物,从而获得强度和冲击韧性的良好配合。
The large diameter and thick wall carbon seamless steel pipe produced by hot rolling has very low impact toughness and easy to brittle fracture during serving process.After heat treatment,the impact toughness of such steel pipe could be improved.Normalizing for the 20 steel pipe can reduce the grain size and improve room temperature impact toughness,but hard to improve low temperature impact toughness.The mixed microstructure of Widmansttten ferrite and pearlite obtained by quenching can improve impact toughness both room and low temperature and strength of the pipe.And tempering at 650 ℃after quenching can make carbides precipitate between Widmansttten ferrite sublathes,and obtain the optimum match of strength and impact toughness.
出处
《金属热处理》
CAS
CSCD
北大核心
2010年第6期52-55,共4页
Heat Treatment of Metals
关键词
大口径厚壁无缝碳素钢管
热处理
铁素体魏氏组织
冲击韧性
large diameter and thick wall thickness carbon steel pipe
heat treatment
Widmansttten ferrite
impact toughness
