Overview
N08825 (Alloy 825 / Incoloy 825 / EN 2.4858) is the industry-standard nickel-iron-chromium alloy for acid corrosion service. Titanium stabilization prevents intergranular corrosion after welding; molybdenum and copper provide exceptional resistance to reducing acids such as sulfuric and phosphoric acid; 21% chromium protects against oxidizing media; and 3% molybdenum resists pitting and crevice attack in chlorides. Compared with stainless steels, 825 is virtually immune to chloride stress corrosion cracking and is qualified for sour service under NACE MR0175 / ISO 15156-3. Shanghai Vertex Alloy Co., Ltd supplies N08825 seamless tube (ASTM B163/B423) and welded tube (ASTM B704/B705) from 6 to 114 mm OD with EN 10204 3.1 certificates. Contact Shanghai Vertex Alloy Co., Ltd for latest stock, sizes and pricing.
Description (English)
Shanghai Vertex Alloy Co., Ltd (Vertex Alloy) supplies N08825 nickel alloy tube (Incoloy 825 / UNS N08825 / EN 2.4858 NiCr21Mo, similar to Chinese GB NS142). Alloy 825 is a titanium-stabilized nickel-iron-chromium alloy with molybdenum and copper additions, offering outstanding corrosion resistance in both reducing and oxidizing environments — excellent in sulfuric and phosphoric acids, and highly resistant to chloride stress corrosion cracking, pitting and crevice corrosion. Material complies with NACE MR0175 / ISO 15156-3 for sour (H₂S) oil & gas service. Seamless tubes to ASTM B163/B423 and welded tubes to ASTM B704/B705, OD 6–114 mm, supplied annealed with EN 10204 3.1 mill test certificates. Non-standard sizes, custom lengths and cut-to-length are available. Contact us for the latest stock and pricing.
Size Range
- 6–114 mm (1/4"–4")
- 0.5–15 mm (BWG / SCH)
- Up to 18,000 mm or cut-to-length available
Grade Specification
| System | Value |
|---|---|
| USA | Alloy 825 / Incoloy 825 |
| 🇺🇸 UNS | N08825 |
| 🇪🇺 EN | 2.4858 / NiCr21Mo |
| 🇨🇳 GB | NS142 (0Cr21Ni42Mo3Cu2Ti) |
| Spec | ASTM B163 / B423 / B704 / B705 |
Chemical Composition
| Element | Value |
|---|---|
| Ni | 38.0–46.0 |
| Cr | 19.5–23.5 |
| Fe | ≥ 22.0 (balance) |
| Mo | 2.5–3.5 |
| Cu | 1.5–3.0 |
| Ti | 0.6–1.2 |
| C | ≤ 0.05 |
| Mn | ≤ 1.0 |
| Si | ≤ 0.5 |
| S | ≤ 0.03 |
| Al | ≤ 0.2 |
Mechanical Properties
| productCenter.property | Value |
|---|---|
| Tensile Strength | ≥ 586 MPa |
| Yield Strength | ≥ 241 MPa |
| Elongation | ≥ 30% |
| Hardness | ≤ 90 HRB |
Physical Properties
| Property | Unit | Value |
|---|---|---|
| Density | g/cm³ | 8.14 g/cm³ |
| Melting Range | °C | 1370–1400°C |
| Thermal Conductivity | W/m·K | 11.1 W/(m·K) |
| CTE (20–100°C) | - | 14.0 × 10⁻⁶ /K |
| Specific Heat | J/kg·K | 442 J/(kg·K) |
| Elastic Modulus | GPa | 195 GPa |
| Electrical Resistivity | μΩ·cm | 1.13 μΩ·m |
Applications
- Industry Typical Parts Chemical Processing
- Oil & Gas
- Nuclear
- Environmental
- Marine