Materials Carbon Steel : API 5L , ASTM, A53 , A105 , A106 , A179 , A216 , A234 , A335 and etc. Stainless Steel: AISI 302 , 304 , 304L , 310 , 316 , 316L , 315Cu , 316 Ti , 321 , 410 , 420 , 430 ,           Copy right @ 2009.Design by farnaam About us | Products | Materials | Contact us