steel pipe standards ASTM, API, DIN, EN, BS, JIS, UL, used in structure, liquid transfering, sprinkler syetem.EMT,frame steel pipeincluding ERW and Seamless ... pipe, casing pipe, sprinkler fire fighting system tube (with groove available), EMT conduit, furniture tube and so onCERTIFICATE: ISO9001, UL, FM, CE steel pipe ...