Incoloy 925 (UNS N09925): Certified Supplier of Round Bars, Seamless Tubes & Plates
Date: 2026年6月27日 Categories: News Views: 156
Hangbo Alloy Group provides premium Incoloy 925 products, including high-strength round bars, seamless tubes, and oilfield-grade forgings. Below is the technical profile for Incoloy Alloy 925:
Detailed Introduction to Incoloy 925
INCOLOY® alloy 925 (UNS N09925) is an age-hardenable nickel-iron-chromium alloy with additions of molybdenum, copper, titanium, and aluminum. It is engineered to provide a combination of exceptional high strength and outstanding corrosion resistance. The nickel content provides protection against chloride-ion stress-corrosion cracking, while the molybdenum and copper enhance resistance to reducing environments. The titanium and aluminum additions enable strengthening through precipitation hardening (aging).
Key Standards: ASTM B805 (Bar/Wire), NACE MR0175, API 6A.
Chemical Composition of Incoloy 925 (UNS N09925)
| Element | Content (%) |
|---|---|
| Nickel (Ni) | 42.0 - 46.0 |
| Iron (Fe) | Remainder (22.0 min) |
| Chromium (Cr) | 19.5 - 22.5 |
| 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 max |
Mechanical Properties (Aged Condition)
| Property | Typical Aged Value |
|---|---|
| Tensile Strength | 1154 MPa (167 ksi) |
| Yield Strength (0.2% Offset) | 832 MPa (120 ksi) |
| Elongation | 27% |
| Hardness (Rockwell C) | 32 HRC |
Material Characteristics
- Sulfide Stress Cracking Resistance: Exceptional resistance in "sour" (H2S-containing) crude oil and natural gas environments.
- High Strength: Precipitation-hardened for superior yield and tensile properties compared to non-aged alloys.
- Chloride Resistance: High nickel content ensures immunity to chloride-ion stress corrosion cracking.
- Versatile Corrosion Resistance: Performs well in both reducing (sulfuric, phosphoric acids) and oxidizing media.
Common Applications of Incoloy 925
- Oil & Gas: Down-hole and surface gas-well components including valves, hangers, tool joints, and packers.
- Marine: High-strength pump shafting and marine fasteners.
- Chemical: High-pressure piping systems handling corrosive acids.
Pros & Cons of Incoloy 925
| Pros | Cons |
|---|---|
| Ideal balance of high mechanical strength and sour service resistance. | Significant material cost due to high nickel and molybdenum content. |
| Strong resistance to localized pitting and crevice corrosion. | Aging heat treatment requires precise control and increases production time. |
| Excellent stability in high-pressure oilfield environments. | Machining is more challenging than non-hardened alloys like 825. |
Frequently Asked Questions (FAQ)
Q: How does Incoloy 925 differ from Incoloy 825?
A: Incoloy 925 is essentially an age-hardenable version of 825. The addition of aluminum and titanium allows for precipitation strengthening, yielding much higher strength levels.
Q: Is Incoloy 925 suitable for seawater?
A: Yes, its composition provides outstanding resistance to seawater and brine, especially in high-velocity pump applications.
Internal Links:
Incoloy 825 - The Solid Solution Baseline
Monel K-500 - Another High-Strength Marine Alloy
Production Process
Our Incoloy 925 is produced using **VIM + ESR** melting to ensure ultra-high purity. Products are typically supplied in the solution-annealed and aged condition to meet the high-strength requirements of API 6A and NACE MR0175.
Testing & Inspection
- SSC Testing: Sulfide Stress Cracking resistance verification.
- Mechanical Verification: Tensile and yield tests in the aged state.
- Ultrasonic Testing: Ensuring internal soundness of large forgings.
Quality Control
Compliance with **ASTM B805** and **NACE MR0175/ISO 15156** is mandatory. Each batch is supplied with full mill certification and chemical analysis.
Product Forms & Standards Comparison
| Product Form | Main Standard | Typical Range |
|---|---|---|
| Round Bar | ASTM B805 | Φ10mm - Φ350mm |
| Tubulars | ASTM B163/B423 | OD 60mm - 250mm |
| Forgings | ASTM B564 | Custom Hangers/Valves |
