Chestnut - of up characteristics and resistance to hydrogen erosion characteristics superior low-alloy steel

摘要

PURPOSE:To manufacture a low-alloy steel excellent in creep characteristics and hydrogen attack-resisting characteristic, by incorporating specific percentages of C, Si, Mn, Cr, Mo, W, V, Al, N, P, and S to Fe. CONSTITUTION:The low-alloy steel consisting of, by weight, 0.05-0.20% C, =0.50$ Si, =1.5% Mn, 2.0-8.0% Cr, 0.1-1.6% Mo. 0.1-2.5% W, 0.05-0.50% V, =0.05% Al, =0.0050% N, =0.010% P, =0.004% S, and the balance Fe with inevitable impurities is prepared. Further, 1 or =2 kinds among 0.05-1.0% Ni, 0.005-0.08% Ti, 0.005-0.10% Nb, 0.0003-0.006% B, 0.05-1.0% Cu, and 0.005-0.06% Zr and/or either or both of 0.001-0.10% REM and 0.001-0.05% Ca can be incorporated, is necessary. In this way, the low-alloy steel suitable for use in material for pressure vessels and tubing which are to be subjected to long-period operation under high-temp. and high-pressure hydrogen can be obtained.