| 摘要 |
PURPOSE:To obtain a low-alloy steel with hydrogen resistance for high temp. and pressure service by alloying Fe with specified amounts of C, Si, Mn, Cr, Mo an REM and/or Ca. CONSTITUTION:The composition of a low-alloy steel with hydrogen resistance for high temp. and high pressure service is composed of, by weight, 0.05-0.25% C, 0.015-0.7% Si, 0.2-1.5% Mn, 0.5-3.5% Cr, 0.3-1.5% Mo, 0.01-0.1% REM and/or 0.001-0.01% Ca and the balance Fe with inevitable impurities. It is necessary that the amounts of Si and REM in the composition are within the range defined by points A(0.015% Si, 0.01% REM), B(0.1% Si, 0.01% REM), C(0.7% Si, 0.03% REM), D(0.7% Si, 0.1% REM) and E(0.015% Si, 0.1% REM) in the diagram.
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