硫化氢环境中改进型15CrMoR（H）材料应力腐蚀综合性能评价

为评价改良冶炼工艺下的新型15CrMoR(H)材料在饱和硫化氢(H₂S)中抗环境开裂的综合性能,依据NACE及国家标准,从恒载拉伸、三点弯曲、氢致开裂3个角度对材料进行了系统的试验研究,并对恒载拉伸试验结果进行分析与拟合,给出了材料应力-寿命的数学模型.结果表明:恒载拉伸应力腐蚀门槛值σ_th为0.7R_eL(252MPa),三点弯曲名义应力S_C大于4.5R_eL(1 620 MPa),HIC试验中裂纹长度率CLR为4.40%、裂纹厚度率CTR为0.87%、裂纹敏感率CSR为0.04%,与EFC规定的合格标准相比较,分别为3.4、3.4及37.5倍.不同角度的多项试验结果均说明该材料具有优良的抗硫化氢环境开裂能力.

Evaluation of Stress Corrosion Resistance Properties of the Modified 15CrMoR(H) in H2 S Environment

To evaluate the hydrogen resistant properties of the 15 CrMoR ( H ) with a new smelting process, according to NACE and National Standards, three tests including NACE standard tensile test, NACE standard bent-beam test and hydrogen induced cracking test were executed in saturated hydrogen sulfide ( H2 S) environment. Stress-life mathematical model of this material was given by analyzing and fitting the results of tensile test. Test results show that the threshold σth of tensile test is 0.7ReL (252 MPa);the threshold nominal stress SC of bent-beam is higher than 4.5ReL (1 620 MPa); and for HIC test, the crack length rate ( CLR) is 4.40%, the crack thickness rate ( CTR) is 0.87% and the crack sensitive rate (CSR) is 0.04%. Compared with the EFC standard, the safety margin of HIC test is 3.4, 3.4 and 37.5 times, respectively. All the experimental results show that the new 15CrMoR(H) material has excellent H2 S environmental cracking resistance properties.