steel pipe standards ASTM, API, DIN, EN, BS, JIS, UL, ISO used in structure, liquid transfering, sprinkler syetem.frame Steel ... tube, scaffolding tube, water transferring tube, oil pipe, casing pipe, sprinkler fire fighting system tube (with groove or ... not), EMT conduit, furniture tube and so onCERTIFICATE: ISO9001, UL, FM, CE steel pipe ...