Uns C72900 C729 «2025»

| Property | Value | |----------|-------| | Density | 0.318 lb/in³ (8.80 g/cm³) | | Electrical Conductivity | 6–10% IACS | | Thermal Conductivity | 25–35 W/m·K (at 20°C) | | Modulus of Elasticity | 18–19 Msi (124–131 GPa) | | Melting Range | 1900–2050°F (1040–1120°C) | | Magnetic Permeability | < 1.01 (non-magnetic) |

C72900 is available in several tempers, with (Age Hardened, Turned) and XT (Extreme Temper, cold worked + aged) being most common. uns c72900 c729

| Process | Guidelines | |---------|------------| | | Best performed in the annealed condition. Cold working beyond 20 % strain may cause cracking in the hardened states. | | Welding | Pre‑heat not required for thickness ≤ 12 mm. Recommended filler metals: ER308L , ER309L , ER316L for corrosion‑critical zones, or EPRI‑17‑4 filler for matching alloy. Post‑weld heat treat (solution anneal + aging) restores strength. | | Machining | Good machinability in annealed state; H900 is tougher and may require carbide tooling, low feed, high rpm, and ample coolant. Typical cutting speeds: 60–90 m/min (HSS) → 150–200 m/min (carbide). | | Heat‑treatment after machining | If final dimensions are critical, perform solution anneal → water quench → age after machining to avoid distortion. | | Surface finish | Polished to < 0.2 µm Ra for critical corrosion zones; standard 120‑grit (Ra ≈ 2 µm) is adequate for most mechanical parts. | | Property | Value | |----------|-------| | Density | 0

[Your Organization] Prepared by: ChatGPT (OpenAI) – Technical Research Assistant Date: 10 April 2026 | | Welding | Pre‑heat not required for