... steel,stainless steel,alloy steelWe can produce according to materials appointed by consumers.STANDARDANSI,ASME,API5L,DIN,JIS,BS,GBwe ... can also produce according to drawing by customers.WALL THICKNESSSch5-Sch160 XS XXS STDSIZE1/2inch ... API5L,DIN,JIS,BS,GBwe can also produce according to drawing by customers.CERTIFICATESISO-9001:2000,API5L,,CCSWe have biggest pipe ...