... ~25mm Standard:ASTM A312, D3/T3 GUOBANG STEEL have Pipe and Pipe Fittings process workshop,ISO9001:2008,PED97/23/EC,and AD2000 ... ,GOST and RTN certfied, month output:550metric ton for pipe, 300metric ton for pipe fittings.316L mod is the modified 316L, standard ... , 317L, 309S/309H, 310S, 321/H, 347H,316LMod,310MoLN ,253MA,254SMO ect. Duplex Material: S31803, S32750, S32760,S32205,17-4PH etc ...