Its unique composition includes:
- Nickel (Ni): ≈30% (enhances corrosion resistance and stability)13
- Chromium (Cr): ≈28% (provides high-temperature oxidation resistance and improves general corrosion resistance)13
- Molybdenum (Mo): ≈6% (increases resistance to pitting and crevice corrosion)13
- Iron (Fe): Balance (contributes to mechanical strength and cost-effectiveness)1
Similar Grades:
- UNS N08031 (USA), 1.4562 (DIN/Germany), Incoloy 31 (trade name)134
Outstanding Performance Characteristics
Superior Corrosion Resistance:
- Resistant to sulfuric acid, phosphoric acid, and chloride-induced stress corrosion cracking (SCC) up to high temperatures235.
- Excellent performance in seawater, brine, and other chloride-containing environments24.
High-Temperature Strength:
- Maintains mechanical properties at temperatures up to 1000°C (1832°F), with good creep resistance23.
- Tensile strength: typically ≥620 MPa; Yield strength: ≥275 MPa; Elongation: ≥35%13.
Excellent Weldability:
- Suitable for all common welding processes, including TIG, MIG, and submerged arc welding34.
- Low risk of sensitization and intergranular corrosion in the heat-affected zone (HAZ)23.
Production Techniques
Alloy31 round bars are meticulously produced through:
Melting & Casting:
- Vacuum induction melting (VIM) or electric arc melting (EAF) to ensure high purity and uniform composition13.
- Continuous casting or ingot casting followed by hot rolling to form billets14.
Thermal Processing:
- Hot working at temperatures between 1000°C and 1250°C (1832°F to 2282°F) for shaping and sizing13.
- Solution annealing at 1010°C to 1150°C (1850°F to 2093°F) followed by rapid cooling to optimize microstructure14.
Finishing:
- Cold drawing, grinding, or polishing to achieve precise dimensions and surface finishes134.
Wide Range of Applications
Alloy31 round bars find their place in:
- Chemical Processing: Reactors, heat exchangers, and storage tanks for sulfuric acid, phosphoric acid, and other corrosive chemicals235.
- Oil & Gas: Downhole equipment, pipelines, and valves in sour gas and high-temperature oilfield services35.
- Marine Engineering: Offshore platforms, seawater desalination plants, and shipbuilding components exposed to marine environments24.
- Power Generation: Flue gas desulfurization systems, nuclear reactor components, and thermal power plant equipment345.
- Alloy31 Round Bar
- UNS N08031 Nickel-Chromium Alloy
- 4562 Corrosion-Resistant Rod
- Incoloy 31 Supplier
- High-Temperature Alloy31 Stock
Certified suppliers offer Alloy31 round bars in diameters ranging from 6mm to 300mm, complying with ASTM B409, EN 10088-1, and other international standards134.
Alloy31 round bar, UNS N08031 alloy, 1.4562 supplier, corrosion-resistant nickel-chromium alloy.
