Socket-welding flange 1,Material: Stainless Steel, Carbon Steel, Alloy ... " to 64" 3,Standard: BS,DIN etc Socket-welding flange Production standard: GB/T9112~9124-2000 JB/T81-94 ... , Orifice Flanges, Lap Joint Flanges, Ring Joint Flanges, Long Welding Neck Flanges, Figure 8 Blanks Stainless steel: 304 321 304L ... Class: 150LB 300LB 600LB 900LB 1500LB 2500LB Classification of type: 1,PL SO WN SW TH PJ/RJ PJ ...