摘要
国内超临界(SC)、超超临界(USC)火力发电机组锅炉制造及管道安装中,主蒸汽管道及锅炉受热面的再热器采用SA335P91钢与12Cr1MoV钢实施的焊接,对其异种铁素体耐热钢的焊接机理进行研究,阐述了两种耐热钢的金属结构特点和焊接性能.通过理论分析和实践确认了该两种异种耐热钢在焊接过程产生热冷裂纹、韧性降低、脆化及Ⅳ型软化开裂的倾向和主要因素.有针对性的采取了相适应的工艺措施和合理的热处理方案,获得了优良的焊接接头.对即将应用到实际生产的其它异种耐热钢,特别是铁素体异种钢的焊接具有较好的参考价值.
Dissimilar metal welds between SA335P91 and 12Cr1MoV ferritic heat-resistant steels are widely applied in the main steam pipe and the reheater on boiler heating surface for the supercritical(SC) and ultra-supercritical(USC) thermal power units in China.The characteristics of microstructure and weldability of two steels were described,and the welding mechanism for dissimilar metal weld between two steels was investigated.Through theoretical analysis and experiments,the main factors in dissimilar metal welding that resulted in hot and cold cracks,decrease of toughness,embrittlement and type IV softening cracking tendency were determined.Corresponding technological methods and heat treatment procedures to prevent the above defects were proposed and solid joints were achieved.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2012年第8期77-80,117,共4页
Transactions of The China Welding Institution
关键词
超临界
超超临界
异种耐热钢
铁素体
焊接
supercritical
ultra-supercritical
dissimilar heat resistant steel
ferrite
welding
