Excellent weldability and high-strength low-alloy steel for seamless tube having a corrosion resistance

摘要

At high intensity steel and high intensity welding possible metal tubing. This invention regards the welding possible metal tubing at the high intensity steel and high intensity. The steel the smallest yield strength of 620MPa and has the tensile strength of 690MPa at least, is characterized by the constitution which the weldability which excels and the tolerance for stress corrosion crack is to include high intensity for the seamless metal tubing the low-alloy steel in claim 1 shows.