Applications
Industrial
Offshore Industry, Furnace Linings, Geothermal Power Plants, ect.
Features
Grade 1
- Exceptional resistance to pitting, crevice corrosion, erosion and intergranular corrosion
- Immunity to chloride-induced stress corrosion cracking
- Good resistance to mineral acids such as nitric, phosphoric, sulfuric and hydrochloric acid
- Good resistance to alkalis and organic acid
- Good mechanical properties
Grade 2
- Excellent creep strength above about 600°C
- Good resistance to many types of hot gas corrosion, particularly chlorination
Material
Alloy 625 / UNS N06625 / 2.4856
Surface
Bright annealed / annealed
Package
Wooden case
Chemical composition (Nominal) %
| Grade | C | Mn | Si | P | S | Cr | Cb+Ta | Co |
|---|---|---|---|---|---|---|---|---|
| Alloy 625 | 0.10 max | 0.50 max | 0.50 max | 0.015 max | 0.015 max | 20.0-23.0 | 3.15-4.15 | 1.0 max |
| Mo | Fe | Al | Ti | Ni | |
|---|---|---|---|---|---|
| 8.0-10.0 | 5.0 max | 0.40 max | 0.40 max | 58.0 min |
Physical properties
| Density | 8.47 g/cm3 (0.306 lb/in3) |
|---|
Heat treatment
| Soft Annealing | Solution Annealing |
|---|---|
| Alloy 625 is used in applications where the operating temperatures are below 600°C (1,112°F) in the soft annealed condition (grade 1). The soft annealing is carried out at temperatures of 950 to 1,050°C (1,742 to 1,922°F); a temperature of 980°C (1,796°F) is preferred. | For applications above 600°C (1,112°F), the solution annealed variant of Alloy 625 (grade 2), which provides optimized creep strength, is used. The solution heat treatment should be carried out in the temperature range between 1,080°C and 1,160°C (1,976 and 2,120°F), preferably at 1,120°C (2,048°F). |
Pipe and tube
Standard
ASTM B444 for seamless pipe and tube
Mechanical properties
| Heat Treatment | Tensile Strength, min, ksi (MPa) | Yield Strength, min. (0.2% offset), min, ksi (MPa) | Elongation in 2 in. or 50.8 mm (or 4 D), min, % |
|---|---|---|---|
| Grade 1 (annealed) | 120 (827) | 60 (414) | 30 |
| Grade 2 (solution annealed) | 100 (690) | 40 (276) | 30 |
Round bar
Standard
ASTM B446
Mechanical properties
| Heat Treatment | Tensile Strength, min, ksi (MPa) | Yield Strength, min. (0.2% offset), min, ksi (MPa) | Elongation in 2 in. or 50 mm (or 4 D), min, % |
|---|---|---|---|
| Grade 1 (annealed) Up to4 |
120 (827) | 60 (414) | 30 |
| Grade 1 (annealed) Over 4 to 10 |
110 (758) | 50 (345) | 25 |
| Grade 2 (solution annealed) | 100 (690) | 40 (276) | 30 |
Download the Alloy 625 pipe and tube datasheet (PDF)
Download the Alloy 625 round bar datasheet (PDF)
More grades: Nickel Alloys. Where to buy: Service Network.
