What does TP mean from astm a 312 TP 304?

In ASTM A312, "TP" stands for "tubing product," indicating that the stainless steel is intended for use in pipe or tubing applications. The "304" refers to the specific grade of stainless steel, which contains approximately 18% chromium and 8% nickel, known for its corrosion resistance and good mechanical properties. This designation signifies that the material is suitable for various environments, including those involving high temperatures and corrosive conditions.