Ferritic stainless steel pipe, pipe end thickened structure, welded joint, and welded structure with excellent salt damage resistance in gaps

摘要

This ferritic stainless steel pipe has a mass% of C: 0.001 to 0.100%, Si: 0.01 to 2.00%, Mn: 0.01 to 2.00%, P: 0.001 to 0%. 0.05%, S: 0.0001 to 0.005%, Cr: 10.5 to 20.0%, Sn: 0.001 to 0.600%, Ti: 0.001 to 1.000%, Al: 0.001 to 0.100%, N: 0.001 to 0.02%, the balance being Fe and inevitable impurities, the pipe end having a pipe end thickening part, The gap distance d (μm) formed in the above formula satisfies the relationship of d ≧ Cr2 / (1000Sn) (Cr and Sn in the formulas indicate the contents (% by mass) of the respective elements).