... 3-610mm,WT:6-70mm,length:6-12m or according to the requirement of clients.4.Excutive standards:GB,ASME API5L ... JIS,and so on,and also develop new products according to the requirements of our clients!5.Surface:black lacquered,varnish ... boiler and ship-building,liquid service,petroleum cracking,chemical fertilizer equipment,drawing-oil-equipment and structure purpose!8.Packing:bundles wrapped with strong ...