METHOD FOR FABRICATING STEEL PIPE USING TIG WELDING AND STS201 STEEL PIPE USING THE SAME

摘要

PURPOSE: A method for fabricating a steel pipe using TIG welding and a STS201 steel pipe using the same are provided to improve moldability and workability by increasing solid solution heat treatment temperature, higher than the general heat treatment temperature of a general STS201 steel sheet. CONSTITUTION: A method for fabricating a steel pipe comprises following steps. An austenite steel sheet is slit to the external diameter width of a steel pipe to form a skelp(S-11). The skelp in the shape of a roll is released to control CRT curvature and an edge is ground(S-12). The skelp is molded in the shape of a pipe by a multi-stage roll(S-13). The both edges of the skelp are welded using tungsten arc(S-14). A welding part is high melting heat-processed(S-15).