The Effect of Welding Material on Weld Microstructure and Properties of Spiral Two-step Welding Pipe
Abstract: Aim at the problem of LASO steel weld impact property which occurred in mass production spiral two-step welding pipe， using the welding wire with higher contents of Cr， Ni ，Ti and other elements to conduct welding， weld sample was taken out through different welding match， the microstructure and mechanical properties were analyzed， the results indicated that the total quantity of proeutectoid ferrite distributed in both sides of column crystal was reduced after replacing welding wire. The weld microstructure mainly included acicular ferrite， the grain of acicular ferrite (AF)， proeutectoid fen'ite (PF)was finer， its impact toughness value was obviously increased. Key words: spiral two-step welding pipe; welding material component; proeutectoid ferrite (PF); acicular fenite (AF); impact toughness
Cangzhou Steel Pipe Group (CSPG)Co.,Ltd.
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