... low roughness. Especially for TP316/L, TP304/L etc We are specialized in producing and selling seamless stainless steel ... norms (eg. GB, ASTM, JIS, DIN) to arrange the production, covering outside diameter 5~219mm, ... /H, 347H, 317/317L, 310S (2520), duplex steel (S31803/S32205), etc. We have experienced engeering team, ... high quality products for our clients. Stainless Steel Pipes acc. to ASTM A312/213