... stainless steel and alloy steel,etc.They are used to seal or block off a pipe,like a cover or ... of blind flanges,in accordance to standards like ASME B16.5,ASME B16.47,DIN 2634,DIN 2636,and so ... CLASS 900, CLASS 1500, CLASS 2500 European Series: PN 2.5, PN 6, PN 10, PN 16, PN 25, PN ... 321, 304, 304L, 316, 316L Surface treatment: Transparent oil, rust-proof black oil or hot galvanized.Payment:T/T OR L ...