Alloy 925
UNS N09925
Description
Alloy 925 is a precipitation-hardenable nickel-iron-chromium alloy with additions of molybdenum, copper, titanium and aluminium. The titanium and aluminium are specifically added to give a strengthening of the alloy during ageing. High levels of nickel ensure protection against stress corrosion cracking, while the additional molybdenum and copper resist reducing environments, in the same way that chromium resists oxidising environments. Molybdenum also enhances resistance to pitting and crevice corrosion. It can be seen that the chemical composition of this alloy is intended to provide a combination of high strength and excellent corrosion resistance. Alloy 925 is suitable for sour gas applications including down-hole and surface gas and well components.
Chemical Component
| Ni | Cr | Mo | Nb + Ta | Cu | Ti | Al | Fe | C | Mn | Si | P | S |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 42-46% | 19.5-22.5% | 2.5-3.5% | 0.08-0.5% | 1.5-3% | 1.9-2.4% | 0.1-0.5% | Bal | 0.025% max | 1% max | 0.35% max | 0.02% max | 0.003% max |
Basic Information
| Items | Alloy 925 |
|---|---|
| Catalog | ACMA-Ni-A021 |
| Density | 8.080 g/cm3 |
| Magnetic Permeability (20 °C) | 1.001 |
| Young's Modulus | 199 N/mm2 |
| Specific Heat, 20 °C | 435 J/(g.K) |
| Electrical Resistivity, 20 °C | 1.17x10-6 Ω-m |
| Electrical Conductivity, 20 °C | 0.25 mΩ/mm2 (1.48% IACS) |
| Thermal conductivity, 20 °C | 12 W/(m.K) |
| Mean coefficient of thermal expansion, 20-100 °C | 13.2x10-6 m/m/K |
Material Forms
Alfa Chemistry offers Alloy 925 in the form of Bar.
Mechanical & Physical Properties
| 0.2% Proof Stress, ksi | Tensile Strength, ksi | Reduction of Area, % | Hardness | Elongation, % |
|---|---|---|---|---|
| 110-140 | 140 | 25 | 38 HRC max. | 18 |
Specifications
Bar: UNS N09925, ASTM B805, API 6A CRA, NACE MR0175-3, API 6CRA 925
Features
- Corrosion performance is particularly suited to the sour environments of down-hole crude oil and natural gas wells.
- Very high-strength, applicable to tooling applications and reducing suspended load of critical components.
- Excellent resistance to stress corrosion cracking.
Applications
Alloy 925 can be used in a variety of applications, including:
- Downhole equipment for corrosive/sour service such as valves, hangers, tool joints and packers
- Marine and pump shafts
- High strength fasteners
- Chemical process industry components
* Technical data included herein should be used as a guideline only, and should not be construed as maximum or minimum values for specification or for final design, or for a particular use or application. The data may be revised anytime without notice.
You Want It? We Got It!
Alfa Chemistry is a manufacturer of standard & custom specialty metals & alloys. We stock a wide variety of alloys in different shapes and specifications. If you can't find the product or specification you need, please contact us directly.
Contact Us