... :Carbon steel: A105A234 ST37.2, A105N, SS316, SS304 A105(N) C22.8 S400 S440 SQ235(CS20#) A106B A53 ... 160, PN 250, PN 320, PN 400 VarietiesSO,WN,PL,BL,SW,THUsagepetroleum,chemical,industry,power,ship building,paper ... workFlange Facing TypesAmerican Series: Flat Face(FF), Raised Face(RF), Tongue(T), Groove(G),Female(F), Male(M), ... receipt of advanced paymentCertificate: ISO9001:2008 Spectacle blind flange