Specifications ASTM/ASMEA/SA213 Seamless(Ferritic) and Austenitic Alloy- Steel Boiler, Superheater, and Heat-exchanger Tubes. ASTM/ASMEA/SA269 Seamless Austenitic Stainless Steel Tubing for General Service. ASTM/ASMEA/SA312 Seamless Austenitic Stainless Steel Pipes Manufacture Process Cold drawn,Cold rolled Size Available (OD)：6.0mm-813mm (WT)：0.5mm-100mm 1/4″ to 32″ 0.02″ to 4″ Fixed Length：1M/2M/3M/6M/12M