... EstandardASME B16.5, ASME B16.47, ASME B16.36,DIN 86341-2000, DIN2505materialCarbon steel(ASTM A105, Q235,A350LF2,A350LF3,) ... China National Petroleum Corporation.We are also qualified the standard material supplier of China National Offshore Oil Corporation and ... Class1500,Class2500SIZE: 1/2" NB TO 48" NB 2.DIN FLANGESStandard: DIN2527,DIN2566,DIN2573,DIN2576,DIN2641,DIN2642, DIN2655,DIN2656, ...