KWK Steel as  one of the best seamless carbon alloy and stainless steel tube products manufacturers and exporters in china.Our main products is different seamless steel tubes:O.D.Range:5mm~820mm.W.T.0.5mm~80mm.Process:Cold drawing,cold rolling,hot rolling,hot expanding.Standard we could supply is as below:ASTM:A53,A106,A192,A179,A210,A519,A312,API 5L,API 5CT,etc.  DIN:DIN17175,DIN1629,DIN2440,DIN2391,DIN2393,etc.      EN:EN10210,EN10255,EN10216,EN10297,EN10305.We export large quantity to many countries because of our high quality and the price is very competetive.If you need some further information,please contact and wish to cooperate.