EN 1.4539 / UNS N08904 Stainless Steel Threaded Rod
Super Austenitic Stainless Steel Fasteners for Severe Corrosion Service
904L stud bolts and fully threaded rods, manufactured from EN 1.4539 / UNS N08904, are super austenitic stainless steel fasteners designed for highly corrosive environments. With high contents of nickel, molybdenum, and copper, 904L threaded rods provide excellent resistance to sulfuric acid, phosphoric acid, chlorides, and stress corrosion cracking.
904L full threaded rods are widely used in chemical processing, offshore, desalination, fertilizer, and pharmaceutical industries
What Is 904L (EN 1.4539 / UNS N08904)?
904L is a low-carbon, high-alloy austenitic stainless steel originally developed for acid-resistant applications.
It is standardized as:
- EN 10088 / EN 10269: 1.4539
- UNS: N08904
ASTM A479 SS 904L stud bolt Manufacturer
904L is an austenitic stainless steel. It is softer than 316L, and its molybdenum addition gives it superior resistance to localized attack
904L stud bolts are made from ASTM A479 904L stainless steel round bar.
Ss904L Stud bolt Specifications
- Standard: ASTM A479 / ASME SA479
- Material Grade: 904L (UNS N08904, W.Nr. 1.4539)
- Thread Types: UNC, UNF, Metric Coarse & Fine
- Sizes: Metric M12 to M100; Imperial size 1/2″ to 4″
- Lengths: Up to 2500 mm
- Types: Fully Threaded ASME B18.31.2 , Double End, Tap End,
SS904L Fasteners Chemical Composition (%)
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.020 |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 19.00 – 23.00 |
| Nickel (Ni) | 23.00 – 28.00 |
| Molybdenum (Mo) | 4.00 – 5.00 |
| Copper (Cu) | 1.00 – 2.00 |
| Nitrogen (N) | ≤ 0.10 |
Mechanical Property Requirements of UNS N08904 Stud bolt
| UNS Designation | Type | Condition | Tensile Strength, min, ksi [MPa] | Yield Strength,<sup>A</sup> min, ksi [MPa] | Elongation in 2 in. [50 mm] or 4D, min, % | Reduction of Area, min, %<sup>B,C</sup> | Brinell Hardness, max |
|---|---|---|---|---|---|---|---|
| N08904 | 904L | annealed | 71 [490] | 31 [220] | 35 | — | — |
Why our 904L Fasteners?
904L stainless steel offers outstanding resistance to a wide range of corrosive environments
- Sulfuric, phosphoric, and acetic acids
- Seawater and marine atmospheres
- Chloride-induced stress corrosion cracking
- Pitting and crevice corrosion
Application of 904L Fasteners
ASTM A479 904L stud bolts are extensively used in following applications
- Chemical Processing Plants: Reactors, heat exchangers, and pressure vessels
- Marine Engineering: Seawater cooling systems and shipbuilding components
- Oil & Gas Industry: Offshore platforms, pipelines, and other equipment subjected to harsh conditions
- Power Generation: Turbines, condensers, and flue gas desulfurization units
Ordering Information
When Send the enquiries or order for ASTM A479 904L stud bolts, please provide:
- Size & Length: e.g., 1 1/2″ x 180mm
- Thread Type: e.g., UNC, UNF, Metric
- Thread Configuration: Single End, Double Ended, Fully Threaded, etc.
- Standard Compliance: ASTM A479 / ASME SA479 MTC as per EN 10204 3.1 or 3.2
904L stud bolts and fully threaded rods made from EN 1.4539 / UNS N08904 provide exceptional corrosion resistance and long-term reliability in acidic and chloride-rich environments. As a superior alternative to standard stainless steel fasteners, 904L threaded rods are a proven solution for critical chemical, offshore, and desalination applications.
