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class 150 forged RF blind flanges Specifications Materials Carbon steel: ASTM/ASME A105,ASTM A694 F42/F46/F48/F50/F52/F56/F60/F65/ F70 Alloy steel: ASTM A182 F1/ F5/F9/F11/F12/F22/F91,A182F12,A182F11 ...