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一、焊接对材料抗氢性能的影响高温高压下氢对铁素体钢的腐蚀早为人们所熟知。一般,炼油化工设备设计都按 Nelson 曲线选用材料,该曲线是根据以往三十余年内高温高压临氢设备破坏的事故、成功的使用经验、挂片试验和实验数据综合绘制而成的。1977年以前的 Nelson 曲线图,对焊态和非焊态的碳素钢分别列出了二条曲线,而对其他碳钼钢和铬钼钢未作是否焊接的区别。1977年修订后的 API941,取消了非焊态的碳素钢曲线,并对碳钼钢曲线作了较大调整。因此,在新版的 Nelson 曲线中,每一公称合金成份的钢种仅有一条曲线,这条曲线当然代表
First, the impact of welding on the hydrogen-resistant properties of materials Under high temperature and pressure hydrogen corrosion of ferritic steel as early as people are well-known. In general, the design of refinery and petrochemical equipment is based on the Nelson curve. The curve is based on the accidental destruction of high-temperature and high-pressure hydrogen plant over the past 30 years, the successful use of experience, the coupon test and the experimental data. The Nelson curve before 1977 lists two curves for welded and non-welded carbon steels separately from the other carbon-molybdenum and chromium-molybdenum steels. 1977 revised API941, canceled the non-welding carbon steel curve, and carbon-molybdenum steel curve made a major adjustment. Therefore, in the new Nelson curve, there is only one curve for each steel grade of the nominal alloy composition, which of course represents