Product Description
Alloy 926 (also known as 1.4529, N08926, Cronifer 1925 hMo) is a premium austenitic stainless steel developed as an enhanced version of Alloy 904L (1.4539). This superaustenitic grade features a higher molybdenum concentration (6.5%) and increased nitrogen content (0.2%), providing significantly improved corrosion resistance, particularly against pitting corrosion and crevice corrosion in chloride-containing environments.
This high-performance alloy displays excellent resistance to stress corrosion cracking, superior general corrosion resistance in both oxidizing and reducing media, and higher strength compared to standard austenitic steels. The nitrogen addition enhances austenite stability and reduces the formation of intermetallic phases, making it ideal for extreme service conditions.
At FUSHUN METAL, we supply Alloy 926 in various forms to meet diverse industrial requirements, providing customers with a material solution that delivers exceptional performance in aggressive environments.
Applications
Thanks to its outstanding corrosion resistance properties, Alloy 926 (1.4529) is extensively used in numerous challenging industries and applications:
- Phosphoric acid production: vaporizers, heat exchangers, tank housings
- Chemical processing: facilities and pipework for diluted sulfuric and phosphoric acid, even when contaminated with chlorides
- Salt extraction: concentration and crystallization plants
- Offshore engineering: fire extinguishing systems, seawater filtration, hydraulics, injection systems
- Oil and gas extraction: pump frames, pump lines, couplings, and wire lines
- Power plants: condenser pipes and pipework systems with heavily contaminated cooling water
- Flue gas desulfurization components
- Pulp industry: facilities for bleaching phases
- Storage and transport tanks for aggressive chemical substances
- Flexible pipes in offshore applications
This versatile alloy performs exceptionally in environments where standard austenitic stainless steels would fail due to chloride attack, making it the material of choice for critical components in marine and chemical processing applications.
Standards
Alloy 926 (1.4529) is produced in accordance with the following international standards:
European Standards:
- EN 10088-2/3: Stainless steels for general purposes
- EN 10028-7: Flat products made of steels for pressure purposes
- EN 10222: Steel forgings for pressure purposes
- VdTÜV Material Data Sheet 502
American Standards:
- ASTM A240/A240M: Standard Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip
- ASTM B625: Standard Specification for UNS N08904, UNS N08925, and UNS N08926 Plate, Sheet, and Strip
- ASTM B649: Standard Specification for Ni-Fe-Cr-Mo-Cu Low Carbon Alloys (UNS N08904, UNS N08925, UNS N08031, UNS N08932, UNS N08926, and UNS R20033)
- API 5LD: Specification for CRA Clad or Lined Steel Pipe
- ASME SA240/SB625: Boiler and Pressure Vessel Code specifications
Other Standards:
- NACE MR0175/ISO 15156: Materials for use in H2S-containing environments
Material Specifications
Designation Equivalents
| Standard | Designation |
|---|---|
| EN | 1.4529 / X1NiCrMoCuN25-20-7 |
| UNS | N08926 |
| Alloy | Alloy 926 |
| Trade Name | Cronifer 1925 hMo |
Chemical Composition
| Element | C | Cr | Ni | Mo | Cu | N | Mn | Si | P | S |
|---|---|---|---|---|---|---|---|---|---|---|
| Min % | – | 20.0 | 24.0 | 6.0 | 0.5 | 0.15 | – | – | – | – |
| Max % | 0.02 | 21.0 | 26.0 | 7.0 | 1.5 | 0.25 | 1.0 | 0.5 | 0.03 | 0.010 |
Mechanical Properties
Alloy 926 (1.4529) offers superior mechanical properties compared to standard austenitic stainless steels, making it suitable for demanding applications.
| Product Form | Yield Strength Rp0.2 (MPa) | Yield Strength Rp0.2 (ksi) | Tensile Strength Rm (MPa) | Tensile Strength Rm (ksi) | Elongation A (%) |
|---|---|---|---|---|---|
| Sheet (≤ 50 mm) | ≥ 300 | ≥ 43.5 | 600-800 | 87-116 | ≥ 40 |
| Strip (≤ 3 mm) | ≥ 300 | ≥ 43.5 | 600-800 | 87-116 | ≥ 40 |
| Bar (≤ 300 mm) | ≥ 300 | ≥ 43.5 | 600-800 | 87-116 | ≥ 40 |
Impact Properties
| Temperature | ISO-V Notch Impact Toughness (J/cm²) |
|---|---|
| 20°C (68°F) | ≥ 150 |
| -196°C (-321°F) | ≥ 125 |
Elevated Temperature Properties
| Temperature | Yield Strength Rp0.2 (MPa) | Yield Strength Rp1.0 (MPa) |
|---|---|---|
| 100°C (212°F) | 230 | 270 |
| 200°C (392°F) | 190 | 225 |
| 300°C (572°F) | 170 | 205 |
| 400°C (752°F) | 160 | 190 |
| 500°C (932°F) | 120 | 150 |
Physical Properties
| Property | Value |
|---|---|
| Density | 8.1 g/cm³ (506 lb/ft³) at 20°C (68°F) |
| Melting Range | 1,320-1,390°C (2,408-2,534°F) |
| Relative Magnetic Permeability | 1.001 at 20°C (68°F) |
| Thermal Conductivity at 20°C (68°F) | 12.0 W/(m·K) |
| Electrical Resistivity | 96 μΩ·cm at 20°C (68°F) |
| Modulus of Elasticity | 193 GPa (28.0 × 10⁶ psi) |
Heat Treatment
For optimal corrosion resistance, Alloy 926 requires proper heat treatment. Solution annealing should be performed at temperatures between 1,150-1,200°C (2,102-2,192°F), preferably at 1,180°C (2,156°F). The retention time during annealing depends on material thickness:
- For thicknesses of d ≤ 10 mm: retention time t = d × 3 min/mm
- For thicknesses of d = 10 to 20 mm: retention time t = 30 min + (d – 10 mm) × 2 min/mm
- For thicknesses of d > 20 mm: retention time t = 50 min + (d – 20 mm) × 1 min/mm
After annealing, rapid cooling in water is recommended to achieve optimum properties. For thin materials (less than 1.5 mm), fast air cooling may be sufficient.
Available Dimensions
FUSHUN METAL supplies Alloy 926 (1.4529) in various product forms and dimensions to meet customer requirements:
Sheet/Plate
- Cold rolled: 1-7 mm thickness, width up to 2,500 mm, length up to 12,500 mm
- Hot rolled: 3-60 mm thickness, width up to 2,500 mm, length up to 12,500 mm, weight up to 1,700 kg
Strip
- Thickness range: 0.025-3 mm
- Width range: 4-750 mm
- Available with various coil inside diameters (300-600 mm)
Rod/Bar
- Outside diameter: 6-800 mm
- Length: 1,500-12,000 mm
Wire
- Drawn: 0.16-10 mm diameter
- Hot rolled: 5.5-19 mm diameter
Custom dimensions and shapes such as discs, rings, seamless or longitudinally welded pipes, and forgings are available upon request.
Corrosion Resistance Properties
Alloy 926 offers exceptional corrosion resistance that makes it suitable for aggressive environments:
- Pitting and Crevice Corrosion: The high molybdenum content (6-7%) combined with nitrogen provides excellent resistance to localized corrosion in chloride-containing environments. The material has a high Pitting Resistance Equivalent Number (PREN) of approximately 47.
- Stress Corrosion Cracking: Very good resistance against chloride-induced stress corrosion cracking, superior to standard austenitic stainless steels.
- General Corrosion: Excellent resistance when in contact with both oxidizing and reducing media, including diluted sulfuric and phosphoric acids, even when contaminated with chlorides.
- Seawater Resistance: Demonstrates outstanding performance in marine environments, making it suitable for offshore applications.
The material shows minimal propensity to form intermetallic phases, contributing to its structural stability in service. For optimal corrosion behavior, the material should be used in clean, passivated condition.
Why Choose FUSHUN METAL for Alloy 926 (1.4529) Supply
When sourcing Alloy 926 (1.4529) for your critical applications in chemical processing, offshore platforms, or marine environments, FUSHUN METAL stands as your premier partner for the following reasons:
- Comprehensive Quality Assurance: Our Alloy 926 products undergo rigorous testing to ensure they meet all specified mechanical properties, chemical composition, and dimensional tolerances.
- Versatile Product Forms: We offer this superaustenitic stainless steel in multiple forms including sheet, plate, strip, bar, and wire, with custom dimensions available to meet your exact specifications.
- Global Certification Compliance: Our products comply with international standards including EN, ASTM, ASME, and special requirements like NACE, ensuring global acceptance and regulatory compliance.
- Technical Expertise: Our metallurgical specialists provide guidance on material selection, processing parameters, and application-specific solutions for Alloy 926.
- Reliable Supply Chain: With strategic inventory management and global logistics capabilities, we ensure timely delivery of your Alloy 926 requirements, minimizing production disruptions.
- Competitive Pricing: Our efficient production processes and direct supply model offer competitive pricing without compromising on quality.
For your next project requiring superior corrosion resistance in challenging environments, contact us to discuss your Alloy 926 requirements. Our team will provide customized solutions tailored to your specific application needs.
Request a quotation today to experience our commitment to quality and service excellence in superaustenitic stainless steel supply.
