Inconel 625 ASTM B446 Specification
This specification covers nickel-chromiummolybdenum-columbium (UNS N06625), nickel-chromiummolybdenum-silicon alloy (UNS N06219), and NickelChromium-Molybdenum-Tungsten Alloy (UNS N06650)* in the form of hot-worked rod and bar and cold-worked rod in the conditions. UNS N06625 products are furnished in two grades of different heat-treated conditions: Grade 1 (Annealed)—Material is normally employed in service temperatures up to 1100°F (593°C). Grade 2 (Solution Annealed)—Material is normally employed in service temperatures above 1100°F (593°C) when resistance to creep and rupture is required.
Inconel 625 Chemical Composition
| Element | Composition Limits, % |
|---|---|
| N06625 | |
| Carbon | 0.10 max |
| Manganese | 0.50 max |
| Silicon | 0.50 max |
| Phosphorus | 0.015 max |
| Sulfur | 0.015 max |
| Chromium | 20.0 min - 23.0 max |
| Columbium + tantalum | 3.15 min - 4.15 max |
| Cobalt (if determined) | 1.0 max |
| Molybdenum | 8.0 min |
| Iron | 5.0 max |
| Aluminum | 0.40 max |
| Titanium | 0.40 max |
| NickelA | 58.0 min |
A. Element shall be determined arithmetically by difference
Mechanical Properties for Hot-Worked Rod and Bar and ColdWorked Rod A
| Diameter or Distance Between Parallel Surfaces, in. (mm) | Tensile Strength min, ksi (MPa) | Yield Strength (0.2 % offset), min, ksi (MPa) | Elongation in 2 in. or 50 mm or 4D, min, % |
|---|---|---|---|
| UNS N06625 Grade 1 (Annealed)B | |||
| Up to 4 (102), incl | 120 | 60 | 30 |
| Over 4 (102) to 10 (254), incl | 110 | 50 | 25 |
| UNS N06625 Grade 2 (Solution Annealed)C | |||
| All sizes | 100 | 40 | 30 |
A. Forging quality is furnished to chemical requirements and surface inspection
only. No tensile properties are required. Forging stock is typically supplied in the
hot worked condition, (see X1.1.5).
B. Annealed 1600°F (871°C) minimum.
C. Solution annealed at 2000°F (1093°C) minimum, with or without subsequent
stabilization anneal at 1800°F (982°C) minimum to increase resistance to sensitization.