利用等强度环法测定了在540 C、9.8 MPa下服役3×105 h后汽缸螺栓用20Cr1MolV1钢在不同初紧应力下,540 C保温不同时间后的应力松弛曲线,外推得到了该钢保温1×104,3×104,1×105 h松弛后的应力值,并与标准规定的不漏蒸汽时的最小应力值进行了对比.结果表明:采用319.51MPa的初紧力对已服役3×105 h的汽缸螺栓进行紧固可基本保证在一个大修期间内汽缸不漏蒸汽.
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