https://www.nickelalloytubes.com/products/astm-a249-asme-sa249-stainless-steel-tube/ ASTM A249/ASME SA249 stainless steel tube by Yuhong group covers nominal wall thicknesses welded and heavily cold-worked welded pipes made of the following materials Various grades of austenitic steel for boilers, superheaters, heat exchangers, or condenser pipes.All Rights Reserved