... -WP12,A234-WP11,A234-WP5 1.Production:API 5L carbon steel pipe 2.Specification:21.3mm&457mm (1/2 ... middle pressure fluid transportation pipeline, Casing Tube, Boiler Pipe, Pertroleunm and natural gas industry Chemistry industry, ... ’s requestments 11.Supply:seamless steel pipe, ERW steel pipe, steel casing tubing, hot-rolled steel pipe, spiral steel pipe, hot-galvanized steel pipe steel pipe(plain end)