Development of New Corrosion-Resistant Stainless Steel NSL310MoCu for Coal Fired Smokestacks

摘要

Corrosion-resistant low cost austeniticstainless steel NSL310MoCu has been newly developed toreplace Hastelloy C-267 and Ti clad steel insingle-loop desulfurization units. In laboratory-accelerated corrosion tests, NSL310MoCu showed goodcorrosion resistance in a smokestack-simulatedenvironment. The corrosion rate of this steel in anoperating coal fired smokestack environment was0.0001g/m2.h and no crevice corrosion was observed. Thecorrosion resistance of theclad former with heat history was the same as that ofthe base metal and it is fully applicable to low-costcladding. The weld ability and properties of weldedjoints were reliable. NSL310MoCu is therefore fullyapplicable for coal-fired smokestacks.