... 400 StandardsGB/T9112-2000GB/T9115.1-2000 GB/T9115.2-2000 GB/T9115.3-2000 GB/T9115.4-2000 GB/T9124-2000GB/T13402-1992SH ... , rust-proof black oil or hot galvanizedFlange Facing TypesAmerican Series: Flat Face(FF), Raised Face(RF), Tongue(T), Groove(G), Female(F), Male ... (M), Ring Joints Face(RJ)European Series: Type A(Flat Face), Type B(Raised Face), Type C(Tongue), Type D(Groove ...