UNS N08031 Seamles Nickel Alloy Steel Pipe Summary
Chemical
|
Element |
Composition (%) |
|
Carbon (C) |
≤ 0.015 |
|
Silicon (Si) |
≤ 0.3 |
|
Manganese (Mn) |
≤ 2.0 |
|
Phosphorus (P) |
≤ 0.020 |
|
Sulfur (S) |
≤ 0.010 |
|
Chromium (Cr) |
26.0–30.0 |
|
Molybdenum (Mo) |
6.0–7.0 |
|
Nickel (Ni) |
30.0–32.0 |
|
Nitrogen (N) |
0.15–0.25 |
|
Iron (Fe) |
Balance |
Mechanical Properties
|
Tensile Strength (min) |
650 MPa (94 ksi) |
|
Yield Strength (0.2% offset, min) |
300 MPa (43.5 ksi) |
|
Elongation (min, 2”-gauge length) |
40% |
|
Hardness (Brinell, max) |
217 HB |
|
Density |
8.1 g/cm³ |
Standards
|
ASTM B622 |
Seamless nickel and nickel-cobalt alloy pipe and tube (primary spec for seamless forms). Covers sizes up to 3.5" (88.9 mm) OD. |
|
ASME SB622 |
Boiler and pressure vessel code equivalent of ASTM B622. |
|
DIN/EN 1.4562 |
European standard for high-alloy steels. |
|
ASTM B619 |
Sometimes referenced for welded variants, but seamless is B622. |
Applications
- Chemical Industry: Phosphoric acid production, sulfuric acid handling, and chloride-contaminated systems.
- Environmental: FGD scrubbers and waste acid treatment.
- Marine/Oil & Gas: Seawater exchangers, offshore platforms, and refining equipment.
- Pulp & Paper: Processing lines exposed to corrosive liquors.
- Other: Ore processing, evaporation/crystallization units, and heat exchangers up to 427°C (800°F).
