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1. Type: Welding neck Flanges, Blind Flanges with RTJ (Ring Joint) Connection 2. Material: 1. Carbon Steel ASTM A694 F42 F46 F48 F50 F52 F56 F60 F65 F70; ASTM A105 A105N A36 , ASTM A350 GR. LF1 LF2 ...