Martensitic Steel for Line Pipe with excellent corrosion Resistance and weldability

摘要

1. A Martensitic Steel for Line Pipe has excellent corrosion Resistance and weldability, which comprises around 0.02% by weight or less C, or.50% by weight or less, 0.2 to 3.0% by weight of MN, 10 14% by weight of CR, 0.2 to 0.7% by weight of MN, 10 to 14% by weight of CR, 0.2 to 7.0 wt% ni, 0.2 to 5 wt% Mo, 0.1 or less in weight of the or.7% by weight or less, and the balance being Faith and incidental impurities; - Cough is substantially elements that satisfy the following Equations: (% Cr) + (+ 0% Mo)1 (% n) - 3 (% c) greater or equal to (12.2%, Cr (MO) + 3.5% (n) + 10% (+ 0.2)% and (c) - 20%) greater or equal to 15.5, 150 (% c) + (N - (100%)% ni) - (Mn) less than or equal to 4.