... 2. OD: 50mm-5000mm, Wall Thickness: 10-400mm,or as your required 3. Standard: ASTM B381, ASTM B348, ASTM F67,ASTM F136, AMS 4928 4. Annual ... 7. Quality Assurance ----According to globally recognized standards, such as ASTM, AMS, ASME,JIS, MIL... -----Chemical composition, Mechanical properties, Microstructure are ...