we are one of chinese company mainly doing steel tube export business,we have our own factory ,our factory is specialised in producing cold drawn seamless carbon steel tube, especially high precision tube used for mechanical, hydraulic,extra heavy wall,auto industry. size range from 6-76mm, thickness 1-15mm. performed standard have DIN2391(BK,NBK,BKS delivery condition), ASTM A519(Grade4130,1020),A513,EN10305-1/-4,EN10216-1/-2,DIN73000,EN10255,EN10297.etc, of course, we also can supply A179(heat exchanger tube), A210,A192(for boiler),DIN1629,BS3059,DIN17175. size from 10-114.3, we can also supply tube which have special mechanical requirement,if you interested, you can send inquiry to me. we have supplied tubes to South Asia,South America,India,European,South Africa. our factory have ISO9001,PED2000,TS16949 cettificate.email:[email protected] ,