What is ASTM B625 Standard?
Specification for UNS N08925, UNS N08031, UNS N08932, UNS N08926, UNS N08354, UNS N08830, and UNS R20033 Plate, Sheet, and Strip
ASTM B625 is a standard specification published by ASTM International that covers plate, sheet, and strip made from several nickel alloys. These alloys are used in various industrial applications where corrosion resistance, high-temperature strength, and other specific properties are critical.
ASTM B625 Nickel Alloy Grades Chemical Compositions:
| Alloy Grade | (Ni) % | (Cr) % | (Mo) % | (Cu) % | (Fe) % | (C) % | (Mn) % | (P) % | (Si) % | (S) % | Other Elements |
|---|---|---|---|---|---|---|---|---|---|---|---|
| UNS N08925 /alloy 25-6MO | 42-46 | 19.5-21.5 | 6.0-7.0 | - | 22 min | ≤ 0.03 | ≤ 2.0 | ≤ 0.03 | ≤ 0.50 | ≤ 0.01 | - |
| UNS N08031 / alloy 31 | 30-32 | 24-26 | 6-7 | 1.4-2.6 | 42 min | ≤ 0.015 | ≤ 2.0 | ≤ 0.03 | ≤ 0.70 | ≤ 0.01 | - |
| UNS N08932 | 32-38 | 19-21 | 2-3 | 3-4 | Bal. | ≤ 0.06 | ≤ 2.0 | ≤ 0.03 | ≤ 1.00 | ≤ 0.03 | - |
| UNS N08926 / Alloy 926 | 24-26 | 19-21 | 6-7 | 1.5-2.5 | Bal. | ≤ 0.02 | ≤ 2.0 | ≤ 0.03 | ≤ 0.50 | ≤ 0.01 | - |
| UNS N08354 | 17.5-18.5 | 19.5-20.5 | 6-7 | 0.18-0.25 | Bal. | ≤ 0.020 | ≤ 1.00 | ≤ 0.03 | ≤ 0.80 | ≤ 0.01 | N 0.18-0.25 |
| UNS N08830 / Alloy 330 | 34-37 | 19-21 | - | - | Bal. | ≤ 0.05 | ≤ 2.00 | ≤ 0.03 | ≤ 1.00 | ≤ 0.03 | - |
| UNS R20033 | 58-63 | 20-24 | 8-10 | - | 3-5 | ≤ 0.015 | ≤ 1.00 | ≤ 0.02 | ≤ 1.00 | ≤ 0.01 | - |
ASME SB 625 Nickel Alloy Grades Mechanical Properties:
| Alloy Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) |
|---|---|---|---|
| UNS N08925 | ≥ 300 | ≥ 650 | ≥ 35 |
| UNS N08031 | ≥ 280 | ≥ 550 | ≥ 35 |
| UNS N08932 | ≥ 300 | ≥ 650 | ≥ 35 |
| UNS N08926 | ≥ 300 | ≥ 650 | ≥ 35 |
| UNS N08354 | ≥ 300 | ≥ 690 | ≥ 35 |
| UNS N08830 | ≥ 205 | ≥ 515 | ≥ 40 |
| UNS R20033 | ≥ 550 | ≥ 690 | ≥ 20 |
ASTM B625 Alloys Applications:
- Chemical Processing: Equipment handling corrosive chemicals such as acids and alkalis.
- Oil and Gas: Components exposed to harsh environments including offshore platforms.
- Marine: Materials resistant to seawater corrosion.
- Power Generation: Boiler components and heat exchangers operating at high temperatures.
- Pulp and Paper: Resistance to corrosive environments in paper processing.
- Desalination: Materials used in seawater desalination plants.
