HIGH-STRENGTH LOW-ALLOY STEEL BOILER TUBE FOR WHICH HEAT-TREATMENT IS SIMPLIFIED AND METHOD OF MANUFACTURING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a high-strength low-alloy steel boiler tube for which heat-treatment is simplified and which is excellent in long-term creep rupture property and high-temperature strength property when used in a high-temperature/high-pressure environment, and a method of manufacturing the same.;SOLUTION: The high-strength low-alloy steel boiler tube for which heat-treatment is simplified comprises, by mass, 0.03-0.15% C, 0.10-0.80% Si, 0.10-1.50% Mn, ≤0.030% P, ≤0.010% S, ≤0.020% O, 0.001-0.01% N, ≤0.01% Al, 0.30-0.80% Cr, ≥0.01% but 0.50% Mo as basic components and the balance being Fe and unavoidable impurities, preferably has a metal structure with a ferrite fraction of 10-90% and is used without any further treatment after normalizing.;COPYRIGHT: (C)2007,JPO&INPIT