| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method of a martensitic stainless steel welded tube excellent in the CO2 gas corrosion resistance of a welded part. SOLUTION: The steel strip stock made of martensitic stainless steel having the composition consisting of, by weight, 10.0-15.0 Cr, and <=0.2% C in impurities is used, and a tube is manufactured by the laser beam welding for a product as it is under the conditions to satisfy the inequalities of 0.4<=P.exp(aT)/(Vt), and 5.0>=P.exp(bT)/(Vt), where P is the laser output (kW), T is the preheat temperature ( deg.C) of the edge part of the steel strip stock V is the welding speed (m/min), (t) is the thickness (mm) of the steel strip stock, (a) is a constant (=0.0006), and (b) is a constant (=0.002). |
