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Alloy 31 (UNS N08031 EN1.4562) Material initially designed as a cost‐effective bridge between conventional 300-series stainless steels and high-nickel alloys, Alloy 31's unique combination of nickel, chromium, molybdenum, and controlled additions of nitrogen delivers outstanding uniform and localized corrosion resistance.
Applicable ASTM / ASME Standards
ASTM B625 / ASME SB625: Standard Specification for UNS N08031 Plate, Sheet, and Strip
ASTM B675 / ASME SB675: Standard Specification for Welded UNS N08031 Pipe
ASTM B676 / ASME SB676: Standard Specification for Seamless UNS N08031 Pipe and Tube
ASTM B649 / ASME SB649: Standard Specification for UNS N08031 Bar and Wire
Alloy 31 Corrosion resistance
In strong acid environments, the alloy 31 can withstand erosion by concentrated sulfuric acid, hydrochloric acid, phosphoric acid, and mixed acids of sulfuric acid and hydrochloric acid with a concentration of up to 98%. At the same time, it has excellent resistance to pitting, crevice corrosion, and stress corrosion cracking (SCC) caused by chlorides and fluorides.
Nickel Alloy 31 High temperature stability
Alloy 31 can still maintain high strength at high temperatures (up to 550°C), and there is no significant decrease in toughness at low temperatures (-50°C). Its mechanical properties in the solution annealed state are particularly outstanding, with a tensile strength of ≥650MPa, a yield strength of ≥300MPa, and an elongation of ≥40%.
Fatigue Of Alloy 31
Under cyclic stress conditions, Alloy 31 exhibits unique fatigue properties. Rotational bending fatigue tests show that its 10⁷-cycle fatigue strength reaches 400MPa, which is 60% higher than that of traditional austenitic steel.
UNS N08031 Material Test
- Mechanical Testing Such as Tensile of Area
- Hardness Test
- Chemical Analysis – Spectro Analysis
- Positive Material Identification – PMI Testing
- Flattening Test
- Micro and MacroTest
- Pitting Resistance Test
- Flaring Test
- Intergranular Corrosion (IGC) Test
Alloy N08031 Sustainable development value
Alloy 31's full life cycle carbon emissions are 28% lower than nickel-based alloys, and the material recovery rate can reach 98%. Its long life reduces the frequency of equipment replacement, and a single sulfuric acid reactor can reduce 300 tons of CO₂ emissions during its life cycle.
Alloy 31 Certification standards
Comply with international standards such as ASTM B625, B676 (plates/pipes) and NACE MR0175/ISO 15156 (acid environment) to ensure material reliability.
Processing of Alloy 1.4562
Hot processing: recommended temperature 1050-1200℃, water cooling or rapid air cooling to ensure uniform organization.
Cold processing: high rigidity equipment is required, and intermediate annealing is required when the deformation exceeds 15%.
Application of Alloy 31 Material
Ocean and Energy: Subsea pipelines, LNG heat exchanger tubes, high-pressure water injection pipes for offshore platforms, resistant to high salt spray, high pressure and hydrogen sulfide corrosion.
Chemical and Petrochemical: Acidic medium transmission pipelines, reactor linings, flue gas desulfurization (FGD) systems, to cope with high-temperature chloride ion environments.
Environmental Protection and New Energy: High-pressure reverse osmosis pipelines for seawater desalination devices, geothermal well casings, with both corrosion resistance and structural lightweight requirements.
Papermaking and Shipbuilding: Bleaching equipment pipelines, ship ballast water pipes, resisting alternating corrosion from pulp acidic solutions and seawater.
Chemical Composition of Alloy 31
| % | Cr | Mn | Fe | Mo | Si | P | Ni | S | Cu | C | N |
| Min | 26.0 | - | Rest | 6.00 | - | - | 30.0 | - | 1.00 | - | 0.15 |
| Max | 28.0 | 2.00 | - | 7.00 | 0.30 | 0.02 | 32.0 | 0.01 | 1.40 | 0.015 | 0.25 |
UNS N08031 Mechanical Properties
| Temper | Annealed | |
|---|---|---|
| Tensile Rm | 94 | ksi (min) |
| Tensile Rm | 650 | MPa (min) |
| R.p. 0.2% Yield | 41 | ksi (min) |
| R.p. 0.2% Yield | 280 | MPa (min) |
| Elongation (2.02 or 4D gl) | 40 | % (min) |
UNS N08031 Physical Properties
| Specific Heat (0-100°C) | 452 | J.kg-1.°K-1 |
| Thermal Conductivity | 11.7 | W.m -1.°K-1 |
| Thermal Expansion | 18.1 | mm/m/°C |
| Modulus Elasticity | 198 | GPa |
| Electrical Resistivity | 1.03 | μohm/cm |
| Density | 8.61 | g/cm3 |
Alloy 31 UNS N08031 EN1.4562 Manufacturer, Supplier
Zhengzhou Huitong Pipeline Equipment Co.,Ltd. not only provide Alloy 31 Pipe, sheet but also supply all different types and scales of pipes, flange,plate,pipe fittings and round bar. Please feel free to contact us for further product information and pricing.
