This is CangZhou QianCheng Steel-Pipe Co.,LTD, my company ‘s  products is carbon seamless steel pipe , This year we have got the API authentication, carbon seamless steel pipe : standard is API 5L ,ASTM A106, ASTM A53, ASTM A179, ASTM A192 AND  DIN 17175/2448, DIN 1629/1626,JIS 3445/3444 and  so on , size from 1/2" to 32",wall thickness from SCH20 TO SCH160,pipe fittings (include BW,SW,THREADED), flange (WN, SO,SW,THREADED, BL) which can fit different standard and material. We also have obtained the certificate of API.If you are interested, please contact with me.