... , ANSI, DIN, JIS, Seamless pipe fittings 3.ISO9001:2000, API 4. Elbow, Tee, Cap, Reducer Cangzhou RIze Steel Pipe Co.,LtdCarbon steel butt straight ... industry,water conservation,boiler and shipbuilding etc.Cangzhou RIze Steel Pipe Co.,Ltd 1.Surface Treatment: ransparent oil or black painting anti-corrosion ... B/L) ASTM A234 WPB ANSI B16.9 black steel pipe fittings