Inconel 625 ASTM B443 Specification
This specification2 covers rolled nickel-chromium
molybdenum-columbium alloy (UNS N06625) and nickel
chromium-molybdenum-silicon alloy (UNS N06219)* plate,
sheet, and strip.
Alloy UNS N06625 products are furnished in two
grades of different heat-treated conditions:
Grade 1 (Annealed) - Material is normally em
ployed 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.
NOTE 1 - Hot-working or reannealing may change properties signifi
cantly, depending on working history and temperatures.
Alloy UNS N06219 is supplied in solution annealed
condition only.
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 |
| 10.0 max | |
| Iron | 5.0 max |
| Aluminum | 0.40 max |
| Titanium | 0.40 max |
| Copper | ... |
| NickelA | 58.0 min |
A. Element shall be determined arithmetically by difference
Mechanical Properties and Other Requirements
Mechanical Properties—The material shall conform to the heat treatment and room temperature tensile properties prescribed in Table 3.
Table 3 - Room Temperature Tensile Properties and HeatTreatment
| Product | Tensile Strength min, ksi (MPa) | Yield Strength (0.2 % offset), min, ksi (MPa) | Elongation in 2 in. or 50 mm or 4D, min, % B |
|---|---|---|---|
| Grade1 UNS N06625 (Annealed) C |
|||
| Cold-rolled sheet and strip | 120 (827) | 60 (414) | 30 |
| Hot-rolled sheet and hot-rolled plate upto 2.75in. (70mm), incl | 110 (758) | 55 (379) | 30 |
| Cold-rolled plate upto 0.375in. (9.5mm), incl | 110 (758) | 55 (379) | 30 |
| Grade 2 UNS N06625 (Solution Annealed) D | |||
| Cold-rolled sheet and strip, hot-rolled sheet, cold-rolled plate, and hot-rolled plate | 100 (690) | 40 (276) | 30 |
A .Yield strength requirements do not apply to material under 0.020in. (0.508mm) in
thickness.
B. Elongation requirements do not apply to material under 0.010in. (0.254mm) in
thickness.
C. Annealed at 1600°F (871°C) minimum.
D. 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.
Referenced Documents
ASTM Standards:
B 446 Specification for Nickel-Chromium-Molybdenum
Columbium Alloy (UNS N06625), Nickel-Chromium
Molybdenum-Silicon Alloy (UNS N06219), and Nickel
Chromium-Molybdenum-Tungsten Alloy (UNS N06650)*
Rod and Bar
B 880 Specification for General Requirements for Chemical
Check Analysis Limits for Nickel, Nickel Alloys and
Cobalt Alloys
E8 Test Methods for Tension Testing of Metallic Materials
E29 Practice for Using Significant Digits in Test Data to
Determine Conformance with Specifications
E 1473 Test Methods for Chemical Analysis of Nickel,
Cobalt, and High-Temperature Alloys