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由于铁素体不锈钢能抗应力腐蚀裂纹,加之无镍铁素体不锈钢较为经济,因此上世纪70年代初,铁素体不锈钢的研究与开发得到了较大关注。一般而言,铁素体不锈钢的主要特点是在氯化物介质中不产生应力腐蚀开裂,耐点蚀和缝隙腐蚀性强,但成形性能及焊接性能差,这成为发展铁素体不锈钢的主要障碍。研究结果表明,这些缺点都是出自韧性差,而起因是碳和氮的含量高,如果将这些间隙杂质含量控制在极低水平,
As ferritic stainless steel can resist stress corrosion cracking, and nickel-free ferritic stainless steel is more economical, so the early 70s of last century, ferritic stainless steel research and development have received greater attention. In general, the main characteristics of ferritic stainless steels are that they do not produce stress corrosion cracking, chloride corrosion resistance and crevice corrosion resistance, but poor formability and weldability, which becomes the main obstacle to the development of ferritic stainless steel . The results show that these shortcomings are derived from the poor toughness, which is due to the high content of carbon and nitrogen, if the gap impurities in the control of very low levels,