The ferritic stainless steel which is superior in processability of the weld, the welded steel pipe and its production method of using this

摘要

This invention the ferritic stainless steel which is superior in processability of the weld, regards the production method of the laser welding metal tubing and its welded steel pipe. As for this invention, weight % with, C: 0.01% or less, N: 0.01% or less, 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%, and Ti: The stainless steel which features that 0.1 - 0.2%, and remainder Fe and the other inevitable impurities is included, is superior in processability of the weld is offered. In addition, as for this invention, when producing the welded steel pipe from the aforementioned stainless steel, hardness ratio of the metal tubing (the HAZ/basic material) 0.98 - 1.05 production method of the stainless steel welded steel pipe and this welded steel pipe which are superior in processability of the weld which is offered.