... ~25mm Standard:ASTM A312, D3/T3 GUOBANG STEEL have Pipe and Pipe Fittings process workshop,ISO9001:2008,PED97/23/EC,and AD2000 ... , 304H, 316L,316Ti, 317L, 309S/309H, 310S, 321/H, 347H,316LMod,310MoLN ,253MA,254SMO ect. Duplex Material: S31803, S32750, S32760,S32205 ... , B163, B165GOST: 9940, 9941JIS:: G3459, G3463DIN: 17456, 17458EN 10216-5 316LMod/1.4435/724L seamless pipe/tube/pipe fittings-Fertilizer