Corrosion Resistant 926 Round Bar UNS N08926 / DIN 1.4529

Product Specification

Corrosion-Resistant 926 Round Bar UNS N08926 / DIN 1.4529

Products Specification

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.

Applications of Alloy 926

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 of Alloy 926 Stainless Steel Bar

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

Chemical Composition

Mechanical Properties

Alloy 926 (1.4529) offers superior mechanical properties compared to standard austenitic stainless steels, making it suitable for demanding applications.

Impact Properties

Elevated Temperature Properties

Physical Properties

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

 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.