Power generation is the primary application for chrome-moly alloy steel buttweld fittings. Ultra-supercritical plants demand WP91 for main steam and reheat lines, while subcritical plants specify WP22 and WP11. IBR (Indian Boiler Regulation) approval is mandatory for Indian power projects.
Main steam lines, hot reheat piping, turbine headers, and superheater outlet headers operating above 600°C. WP91 is the dominant grade for modern USC plants globally. PWHT at 760°C is mandatory.
Boiler superheaters, main steam lines, and hot reheat piping for subcritical plants below 565°C. WP22 has the largest installed base globally. WP11 for lower-temperature steam circuits.
Feed water piping, condensate return, and auxiliary systems. Stainless steel for feed water quality protection. WPB for low-pressure auxiliary piping.
Primary and secondary coolant systems require nuclear-grade stainless steel — SS 304, 316L, and 347 with enhanced material traceability and NDE. Inconel 625 for steam generator components.
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