| 摘要 |
PURPOSE: A high strength, low alloy and heat resistant steel is provided to exhibit an excellent weldability. CONSTITUTION: A high strength, low alloy, heat resistant steel has an average crystal grain diameter of at most 110 microns and essentially consists of, by mass %, C: 0.03 - 0.15%, Si: at most 1%, Mn: at most 2%, P: at most 0.03%, S: at most 0.03%, Ni: at most 0.5%, Cu: at most 0.5%, Cr: 1.8 - 2.8%, V: 0.1 - 0.3%, Nb: 0.01 - 0.08%, Mo: 0.05 - 0.35%, W: 1.2 - 1.8%, Ti: 0.001 - 0.05%, B: 0 - 0.02%, Al: at most 0.1%, O: at most 0.1%, N: in an amount satisfying the formula %N =< %Ti + 5 %B + 0.004, and a remainder of unavoidable impurities.
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