Alloy 925 Round Bar (UNS N09925 / W.Nr. 2.4859)
Alloy 925 Round Bar is a nickel–iron–chromium alloy strengthened by molybdenum, copper, titanium, and aluminum, offering an excellent combination of high strength and outstanding corrosion resistance. It is specifically designed to resist sulfide stress cracking, chloride stress corrosion cracking, and hydrogen embrittlement, making it ideal for demanding oil & gas and marine applications.
Key Features
- Excellent resistance to sulfide stress cracking (SSC)
- High resistance to chloride stress corrosion cracking
- Superior protection against pitting and crevice corrosion
- Good mechanical strength after age hardening
- Resistance to hydrogen embrittlement
- Good weldability and fabrication characteristics
Equivalent Grades
| Standard | Equivalent |
|---|---|
| UNS | N09925 |
| DIN / EN | 2.4859 |
| ASTM | Alloy 925 |
Sizes
- Diameter: 6 mm to 300 mm
- Length: Random, Cut Length, or as per customer requirement
Alloy 925 Chemical Composition
| Element | Percentage (%) |
|---|---|
| Nickel (Ni) | 42.0 – 46.0 |
| Chromium (Cr) | 19.5 – 23.5 |
| Iron (Fe) | Balance |
| Molybdenum (Mo) | 2.5 – 3.5 |
| Copper (Cu) | 1.5 – 3.0 |
| Titanium (Ti) | 1.9 – 2.4 |
| Aluminum (Al) | 0.1 – 0.5 |
| Carbon (C) | ≤ 0.03 |
| Manganese (Mn) | ≤ 1.0 |
| Silicon (Si) | ≤ 0.5 |
UNS N09925 Mechanical Properties
| Property | Typical Value |
|---|---|
| Tensile Strength | ≥ 760 MPa |
| Yield Strength (0.2%) | ≥ 550 MPa |
| Elongation | ≥ 20% |
| Hardness | ≤ 40 HRC (Age Hardened) |
Incoloy 925 Physical Properties
| Property | Value |
|---|---|
| Density | 8.14 g/cm³ |
| Melting Range | 1370 – 1400 °C |
| Modulus of Elasticity | 195 GPa |
| Thermal Conductivity | 11.2 W/m·K |
Types of Alloy 925 Round Bar
- Solution Annealed Round Bar
- Age Hardened Round Bar
- Hot Rolled Round Bar
- Forged Round Bar
Applications
- Oil & gas downhole components
- Sour service environments (NACE MR0175)
- Marine and offshore equipment
- High-strength fasteners and shafts
- Chemical processing components
- Pressure vessels and fittings
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