研制了一种大线能量低焊接裂纹敏感性压力容器用钢,研究了其力学性能、微观组织结构和焊接粗晶热影响区(CGHAZ)的微观组织结构特征及力学性能.结果表明:研制的新钢种集高强度(σs≥490MPa、σb≥610MPa)、高韧度(-20℃,Akv≥47 J)、优异的焊接性能于一体,能够承受大线能量焊接(50 kJ/cm),并具有低焊接裂纹敏感性.CGHAZ中弥散分布稳定的复合氧化物夹杂物促使针状铁素体的形成,针状铁素体的数量与输入线能量有关并显著影响CGHAZ的力学性能.
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