... A106, ST37 2.GB, ANSI, DIN, JIS, Seamless pipe fittings 3.ISO9001:2000, API 4. Elbow, Tee, Cap, Reducer ... Cangzhou RIze Steel Pipe Co.,LtdCarbon steel butt straight Tee and CrossSize: 1/2''-48 ... conservation,boiler and shipbuilding etc.Cangzhou RIze Steel Pipe Co.,Ltd 1.Surface Treatment: ransparent oil or black painting anti ... A234 WPB ANSI B16.9 black steel pipe fittings