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| Chemical Component | Weight % |
|---|---|
| Carbon (C) | ≤ 0.020 |
| Chromium (Cr) | 19.0 – 21.0 |
| Nickel (Ni) | 24.0 – 26.0 |
| Molybdenum (Mo) | 6.0 – 7.0 |
| Nitrogen (N) | 0.15 – 0.25 |
| Copper (Cu) | 0.50 – 1.50 |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 0.50 |
| Iron (Fe) | Balance |
| Mechanical Property | Value (Annealed) |
|---|---|
| Tensile Strength (Rm) | 650 – 850 MPa |
| Yield Strength (Rp 0.2%) | ≥ 300 MPa |
| Elongation (A5) | ≥ 35% |
| Hardness (Brinell) | ≤ 250 HBW |
| Physical Property | Value (at 20°C) |
|---|---|
| Density | 8.1 g/cm³ |
| Thermal Conductivity | 12 W/m·K |
| Electrical Resistivity | 1.0 Ω·mm²/m |
| Specific Heat | 450 J/kg·K |
| Modulus of Elasticity | 195 GPa |
The PREN Value is the most important number for 1.4529 hex bolt, hex nut and washers ,because it proves the material’s superior resistance to localized corrosion (pitting) compared to standard stainless steels.
316L: ~24
904L: ~34
1.4529: 43+ (This qualifies it as a “Super-Austenitic” stainless steel).
Equipment that Requires 1.4529 Bolts
1.Flue Gas Desulfurization (FGD) Scrubbers:These systems clean exhaust gases in power plants. They create a highly acidic, high-chloride “soup” that eats through 316L.
2.Reverse Osmosis (RO) Desalination Plants:High-pressure pumps and membranes handling raw seawater require Alloy 926 fasteners to prevent crevice corrosion.
3.Offshore Oil & Gas Risers:Subsea equipment and splash-zone structures where salt spray is constant.
4.Chemical Heat Exchangers:Specifically those processing phosphoric acid or sulfuric acid at mid-range concentrations.
5.Industrial Bleaching Towers:Used in the pulp and paper industry where chlorine dioxide is present.
in seawater and chemical scrubbing systems, localized pitting can lead to rapid fastener failure. While standard stainless steels like 316L (PREN ~24) suffer from pitting and Stress Corrosion Cracking (SCC), our Alloy 926 fasteners provide a “Super-Austenitic” shield. The high molybdenum (6.5%) and nitrogen content ensure that every hex head cap screw and socket head cap screw remains structurally sound in the most hostile conditions.
Marine & Offshore: Our 1.4529 threaded rods are essential for seawater cooling systems, offshore platforms, and desalination equipment where high-salinity exposure is constant.
Environmental Protection: In Flue Gas Desulfurization (FGD) plants, 1.4529 bolts are required to resist the corrosive condensate formed during gas cleaning.
Chemical Manufacturing: For equipment processing diluted sulfuric and phosphoric acids, using UNS N08926 hardware prevents catastrophic leaks and extends maintenance cycles.
The PREN (Pitting Resistance Equivalent Number) indicates how well a fastener will resist pitting in chloride-rich environments like seawater.
| Material Grade | Common Name | PREN Value | Corrosion Class |
|---|---|---|---|
| 316L (1.4404) | Marine Grade Stainless | 23 – 26 | Moderate |
| 2205 (1.4462) | Duplex Stainless | 31 – 35 | High |
| 904L (1.4539) | Alloy 904L | 34 – 37 | Very High |
| 1.4529 (UNS N08926) | Alloy 926 / Cronifer | 43 – 45 | Super-Austenitic (Extreme) |
*Note: Higher PREN values indicate superior resistance to pitting and crevice corrosion. Materials with PREN > 40 are considered “Super-Austenitic” or “Super-Duplex.”
1. What is the difference between 1.4529 and Alloy 926?
There is no difference in the material itself. 1.4529 is the European Werkstoff number, while Alloy 926 (and UNS N08926) is the American designation. They refer to the same super-austenitic stainless steel often branded as Cronifer 1925 hMo.
2. Why should I use 1.4529 bolts instead of 316L?
Standard 316L often fails in high-chloride environments due to pitting. With a PREN value of ≥ 43, 1.4529 provides extreme resistance to localized corrosion and stress corrosion cracking (SCC), making it essential for offshore and chemical plants.
3. Are 1.4529 hex head cap screws suitable for seawater?
Yes. Due to its 6.5% Molybdenum content, 1.4529 is one of the few stainless alloys that can survive long-term immersion in seawater and brackish water without corroding.
4. What prevents “galling” in 1.4529 threaded rods?
Like most high-nickel alloys, 1.4529 can experience thread galling (seizing). We recommend using high-quality anti-seize lubricants or opting for rolled threads rather than cut threads to ensure smooth installation.
5. Can 1.4529 socket head cap screws be used in acidic environments?
Absolutely. 1.4529 is highly resistant to diluted sulfuric acid, phosphoric acid, and the aggressive media found in Flue Gas Desulfurization (FGD) systems.
6. Do you provide 1.4529 round bars for custom machining?
Yes, we manufacture 1.4529 round bars in various diameters, which can be used to produce custom fasteners, shafts, or valves requiring high corrosion resistance.
Precautions: Use lower cutting speeds and higher feed rates compared to 316L. Ensure the tool is always moving and never dwelling in one spot.
Precautions: Use carbide-tipped tools with PVD coatings. Tools must be kept extremely sharp. A dull tool generates heat, which leads to work hardening and poor thread quality on your socket head cap screws.
Precautions: Thread rolling is highly recommended over thread cutting. Rolling creates a smoother surface finish and compresses the grain structure, which increases the fatigue strength and improves resistance to stress corrosion cracking (SCC).
Need a reliable fastener and CNC machining partner? Watch how our factory delivers quality non-standard parts with short lead times.
Need a reliable fastener and CNC machining partner? Watch how our factory delivers quality non-standard parts with short lead times. Message our team on our website for pricing and availability. Message our team on our website for pricing and availability.
Products widely used in pump, valve ,oil & petrochemical pressure vessel, boiler fluid field etc.
Our sales have more than ten years of experience in this industry. They can communicate with customers effectively and respond within 12 hours. Feel free to sent us inquiry, Thank you very much !
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