Abstract

The corrosion resistance of SAF 2507 duplex stainless steel and 254 SMO superaustenitic steel is studied in aggressive sulfuric-acid solutions (mother liquor) from sulfate departments; in aggressive media from arsenic–soda desulfurization; and in coke-shop media (from the quenching car and quenching tower). Gravimetric tests are conducted in accordance with State Standard GOST 9.908–85. The research is conducted both at coke plants and in the laboratory. It follows from gravimetric tests and cyclic volt–ampere measurements that these materials are highly resistant to point and pitting corrosion in the aggressive media considered. Such corrosion processes are provoked by the presence of activators (H₂S, HCN, HCNS, and Cl^–). These findings are confirmed by the considerable life of passive films of molybdenum-bearing steel. Research shows that SAF 2507 (#Kh25H7AM4#) duplex steel and Avesta 254S MO superaustenitic steel are highly resistant to point and slot corrosion and outperform the ordinary #0Kh23N28M3D3T, 10Kh17N13M2T,# and #12Kh18M10T# steels used for heat-exchanger production.

中文翻译：

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新型双相不锈钢在焦炭生产中的耐腐蚀性

摘要

在硫酸盐部门的腐蚀性硫酸溶液（母液）中研究了SAF 2507双相不锈钢和254 SMO超级奥氏体钢的耐腐蚀性。在砷-苏打脱硫的侵蚀性介质中；和在焦炭车间介质中（来自淬火车和淬火塔）。重量测试按照国家标准GOST 9.908-85进行。这项研究是在焦炭厂和实验室进行的。从重量测试和循环伏安测量得出，这些材料对所考虑的侵蚀性介质具有很高的抗点腐蚀和点蚀的能力。活化剂（H ₂ S，HCN，HCNS和Cl ^–）。这些发现得到了含钼钢钝化膜相当长的使用寿命的证实。研究表明，SAF 2507（＃Kh25H7AM4＃）双相钢和Avesta 254S MO超级奥氏体钢具有极高的点腐蚀和缝隙腐蚀性能，并且优于用于热交换器生产的普通＃0Kh23N28M3D3T，10Kh17N13M2T，＃和＃12Kh18M10T＃钢。