研究了三种常用压力容器用钢20G、1.25Cr-0.5Mo和2.25Cr-1Mo的抗氢蚀能力.充氢试验后,20G钢发生了严重的氢腐蚀,出现整体脱碳,并导致抗拉和屈服强度以及伸长率的严重下降;1.25Cr-0.5Mo钢在原奥氏体晶界上出现少量氢蚀孔洞,抗拉和屈服强度有少量下降,但伸长率没有明显变化;而2.25Cr-1Mo钢则没有任何氢蚀迹象.同时,通过对这三种钢的临投服役寿命的估算也表明,2.25Cr-1Mo钢的抗氢蚀能力远高于1.25Cr-0.5Mo钢,而20G钢只有极低的抗氢蚀能力,与试验试验结论完全符合.该估算方法可以替代经验Nelson曲线并补充其应用的不足.
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