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Introduction ASTM B625 UNS N08031 Plate
ASTM B625 UNS N08031 Alloy 31 Plate is a high-performance nickel-chromium-molybdenum alloy that is primarily used in highly corrosive environments. The exceptional corrosion resistance of this alloy 31 comes from the presence of elements like nickel, chromium, and molybdenum, which make it highly resistant to both oxidizing and reducing acids.
When manufactured to the ASTM B625 standard, UNS N08031 plates, sheets, and strips are optimized for high-reliability service in chemical processing, pulp and paper bleaching plants, marine engineering, and oil and gas production.
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ASTM B625 UNS N08031 Plate Chemical Composition:
| Element | Weight % Base Values |
| Nickel (Ni) | 30.0 – 32.0 |
| Chromium (Cr) | 26.0 – 28.0 |
| Molybdenum (Mo) | 6.0 – 7.0 |
| Iron (Fe) | Balance |
| Copper (Cu) | 1.0 – 1.4 |
| Nitrogen (N) | 0.15 – 0.25 |
| Carbon (C) | 0.015 max. |
| Manganese (Mn) | 2.00 max. |
| Silicon (Si) | 0.30 max. |
ASTM B625 Alloy 31 Sheet Mechanical Properties
- Tensile Strength: 90,000 psi (620 MPa) (minimum)
- Yield Strength (0.2% offset): 45,000 psi (310 MPa) (minimum)
- Elongation in 2 inches: 40% (minimum)
ASME SB 625 UNS N08031 Resistance Corrosion
This alloy 31 plate sheet is known for its excellent resistance to sulfide, chloride, and fluoride stress corrosion cracking. It is also resistant to high temperatures, alloy can typically withstand temperatures well above 1000°C (1832°F)., making it suitable for use in elevated temperature applications. Alloy 31 is also resistant to carburizing and nitriding. Additionally, it has good weldability and formability, allowing it to be easily formed and fabricated.
1.4562 Alloy 31 Heat Treatment
Alloy 31 UNS N08031 is typically solution treated over a temperature range to improve its properties. Heat treatment temperatures can range from 1,950°F to 2,150°F (1,065°C to 1,175°C).
Alloy 31 UNS N08031 Strip Applications
Exceptional Sulfuric & Phosphoric Acid Performance: Thanks to SB625 UNS N08031 Alloy 31 Plate's controlled copper addition (1.0–1.4%), Alloy 31 exhibits elite resistance to reducing environments, making it the premier choice for sulfuric acid transport systems and phosphoric acid evaporation lines.
Immunity to Localized Halide Attack: With a 6.5% Molybdenum content paired with high Nitrogen, UNS N08031 remains virtually immune to severe pitting, crevice corrosion, and chloride-induced stress corrosion cracking (SCC).
Excellent Thermal Stability & Weldability: The low carbon content prevents intergranular precipitation during thermal cycles, ensuring that weld zones maintain identical corrosion defense properties to the parent plate without post-weld solution annealing.
1.4562 Alloy 31 Surface Finish Type
Surface treatment of Alloy 31 usually includes conventional metal surface treatment methods, such as pickling, polishing or mechanical grinding.
Your Trusted Global Source for Alloy 31 Plates & Sheets
Procuring high-performance super-austenitic alloys demands flawless supply chain tracking and material certification. At Zhengzhou Huitong Pipeline Equipment Co., Ltd. (HT PIPE), all of our ASTM B625 UNS N08031 inventories are supplied with complete mill test certificates (MTC) according to EN 10204 3.1.
Whether you need heavy structural plate stock, custom laser-cut profiles, or specialized precision strip coils, our international logistics network guarantees safe and on-time delivery directly to your job site or port facility.
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