| Temper | Tensile Strength (ksi) | Yield Strength (0.2% offset, ksi) | Elongation (%) | Hardness (HRC) | |--------|------------------------|------------------------------------|----------------|----------------| | AT | 120–140 | 105–125 | 8–15 | 28–35 | | XT | 150–180 | 140–170 | 3–8 | 36–42 | | XT UTS (special) | Up to 200 | Up to 185 | ~2 | ~44 |
Not recommended for strong oxidizing acids (e.g., nitric) or ammonia-rich environments. uns c72900 c729
| Organization | Standard / Specification | Scope | |--------------|---------------------------|-------| | | A240/A240M – Standard Specification for Chromium and Chromium‑Nickel Stainless Steel Plate, Sheet, and Strip | General product forms | | | A276/A276M – Standard Specification for Steel Bars, Carbon, Alloy, Stainless, and Tool Steels | Bar, round, square, hex | | | A182/F182 – Forged Fittings | Flanges, fittings | | | A193/A193M – Bolting Materials (e.g., 17‑4 PH bolts) | | AMS | AMS 4331 – Precipitation‑Hardening Stainless Steel, 17‑4PH | Detailed mechanical & heat‑treat data | | SAE | SAE‑AS‑4809 – 17‑4PH for aerospace | Aircraft structural parts | | EN | EN 10088‑3 – Stainless steels, part 3: Martensitic and precipitation‑hardening steels (covers C72900) | | ISO | ISO 9445 – Stainless steels, precipitation‑hardening, UNS C72900 | International product specifications | | NACE | MR0175/ISO 15156 – Materials for H₂S sour service ( | Temper | Tensile Strength (ksi) | Yield Strength (0