Exotic Alloys SS 904L Round Bar Overview
Zeon Exports supplies Exotic Alloys SS 904L (UNS N08904) round bars, a low-carbon super austenitic stainless steel with copper addition for outstanding resistance to sulfuric acid and chloride environments in chemical, pulp & paper and oil & gas applications.
Exotic Alloys SS 904L Round Bar is machined into pump and valve components, agitators and fasteners for chemical processing, pulp bleaching and flue gas cleaning equipment. Its high nickel and molybdenum content, roughly double that of 316L, combined with copper addition gives outstanding resistance to sulfuric acid, pitting and stress corrosion cracking.
- Copper addition gives strong sulfuric acid resistance across concentrations
- Tensile ≥490 MPa, yield ≥220 MPa in the annealed condition
- EN 10204 3.1 certified, export-ready worldwide
Quick Specifications of Exotic Alloys SS 904L Round Bar
Exotic Alloys SS 904L Round Bar is produced to internationally recognized bar specifications.
| Field | Detail |
|---|---|
| Material/Grade | Exotic Alloys SS 904L |
| UNS | N08904 |
| DIN/Werkstoff Number | 1.4539 |
| Standards | ASTM A276, ASTM A479 |
| Form | Round Bar |
| Finish | Hot rolled, turned, ground (as specified) |
| Heat Treatment | Solution Annealed |
| Certification | EN 10204 3.1 |
Equivalent Grades of SS 904L
SS 904L is recognized under several international designations below.
| UNS | DIN/Werkstoff Number | Common Trade Name | ASTM/ASME Standard |
|---|---|---|---|
| N08904 | 1.4539 | 904L | ASTM A276 / A479 |
Chemical Composition of SS 904L
Composition per ASTM A276/A479 for UNS N08904; exact limits can vary slightly by specification and heat.
| Element | Composition (%) |
|---|---|
| Chromium (Cr) | 19.0 – 23.0 |
| Nickel (Ni) | 23.0 – 28.0 |
| Molybdenum (Mo) | 4.0 – 5.0 |
| Copper (Cu) | 1.0 – 2.0 |
| Nitrogen (N), max | 0.10 |
| Carbon (C), max | 0.020 |
| Manganese (Mn), max | 2.00 |
| Silicon (Si), max | 1.00 |
| Phosphorus (P), max | 0.045 |
| Sulphur (S), max | 0.035 |
| Iron (Fe) | Balance |
Physical Properties of Exotic Alloys SS 904L
Typical physical properties for 904L; confirm exact heat-specific figures against the mill test certificate.
| Property | Value |
|---|---|
| Density | ~8.0 g/cm3 (typical) |
| Melting Range | ~1320 – 1390°C (typical) |
| Magnetic Behaviour | Essentially non-magnetic (annealed) |
Mechanical Properties of Exotic Alloys SS 904L Round Bar
Minimum mechanical properties for annealed UNS N08904 per ASTM A276/A479.
| Property | Minimum Value |
|---|---|
| Tensile Strength | 490 MPa (71 ksi) |
| Yield Strength (0.2% offset) | 220 MPa (31 ksi) |
| Elongation | 35% |
| Hardness | 90 HB max |
| Condition | Solution Annealed |
Corrosion Resistance of Exotic Alloys SS 904L
- Exotic Alloys SS 904L Round Bar was developed for medium-concentration sulfuric acid and chloride-bearing environments.
- Acid resistance: copper addition makes it useful across all concentrations of sulfuric acid.
- Pitting and crevice resistance: high molybdenum and nickel give strong resistance to chloride pitting and crevice attack.
- Chloride SCC resistance: high nickel content resists chloride stress corrosion cracking that limits standard austenitic grades.
Heat Resistance of Exotic Alloys SS 904L
Exotic Alloys SS 904L round bar is non-magnetic in the annealed condition and offers good toughness at cryogenic temperatures, but is generally selected for moderate-temperature aqueous and chemical service. Confirm exact service limits against the governing standard and application before specifying.
Key Properties of Exotic Alloys SS 904L Round Bar
Beyond corrosion and heat performance, 904L round bar offers these additional properties.
- Good toughness at cryogenic temperatures
- Excellent formability and weldability
- Greater resistance to ferrite and sigma phase precipitation than 316L
- Widely used in chemical, oil & gas and pharmaceutical industries
Benefits of Exotic Alloys SS 904L Round Bar
Choosing 904L round bar from Zeon Exports delivers measurable advantages for your project.
- Strong sulfuric acid and chloride resistance at moderate cost
- Full MTC 3.1 documentation for project QA/QC requirements
- Multiple sizes and finishes to match exact project specs
- Reliable bulk supply with consistent ready stock
- Competitive export pricing for large industrial orders
- Fast dispatch to global project sites and ports
Related Products
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Frequently Asked Questions About Exotic Alloys SS 904L Round Bar
Common questions about Exotic Alloys SS 904L Round Bar, answered below.
Q1: What is SS 904L?
Ans. SS 904L (UNS N08904) is a low-carbon super austenitic stainless steel with copper addition for sulfuric acid resistance.
Q2: What standards apply to 904L round bar?
Ans. Round bar is manufactured to ASTM A276/A479, certified to EN 10204 3.1 mill test certificates.
Q3: Is 904L magnetic?
Ans. 904L is essentially non-magnetic in the annealed condition, being a fully austenitic stainless steel.
Q4: How does 904L compare to 316L?
Ans. 904L has roughly double the nickel and molybdenum of 316L, plus copper, giving much stronger sulfuric acid and chloride resistance.
Q5: Is 904L suitable for seawater service?
Ans. Yes, 904L has high resistance to pitting and crevice corrosion in chloride solutions including seawater.
Q6: Does 904L require post-weld heat treatment?
Ans. No, its low carbon content minimizes sensitization risk, so post-weld heat treatment is not typically required.
Q7: What certification is provided with orders?
Ans. Every order ships with EN 10204 3.1 mill test certificates confirming grade, heat and dimensions.
Q8: Does Zeon Exports supply custom sizes?
Ans. Yes, round bars are available cut-to-size and in custom dimensions on request for bulk industrial orders.
