FERRITIC STAINLESS STEEL HAVING EXCELLENT FORMABILITY OF WELDED ZONE, WELDED PIPE USING THE SAME AND METHOD FOR MANUFACTURING THE WELDED PIPE

摘要

present invention has excellent workability weld ferritic stainless steel , laser-welded steel pipe and that welded steel manufacturing . relates to a process ; in the present invention are by weight %, C: less than 0.01%, N: less than 0.01%, Si: 0.8 ~ 1.0%, Mn: 0.5% or less , Cr: 13.7 ~ 14.3% , Cu: 0.1 ~ 0.3%, Nb: 0.3 ~ 0.4%, Ti: contains 0.1 ~ 0.2% , with the remainder provides excellent workability of the welded stainless steel , characterized in that Fe and other unavoidable impurities ; . in another aspect, the present invention provides a hardness ratio (HAZ / base material ) is 0.98 to 1.05 of the workability of the welded steel pipe of the welded stainless steel tube excellent in welding steel pipes made from the stainless steel , and for producing a welded steel pipe provides a way .