Stainless Steel 904L Seamless Pipes & Tubes Manufacturer & Supplier
SS 904L (UNS N08904) is a high-alloy austenitic stainless steel with elevated nickel (25%), molybdenum (4.5%), and copper content. It provides exceptional corrosion resistance in sulfuric acid, phosphoric acid, and chloride-containing environments, bridging the gap between standard stainless steels and nickel alloys.
UNS: N08904 | Category: Austenitic Stainless Steel | Werkstoff Nr: 1.4539 | EN Name: X1NiCrMoCu25-20-5
SS 904L — Also Known As
SS 904L is also commonly known as SS 904L, 904L SS, Stainless Steel 904L Seamless Pipes & Tubes, N08904, UNS N08904, 1.4539, Werkstoff 1.4539, W.Nr 1.4539, X1NiCrMoCu25-20-5, 904l, aisi 904l, alloy 904l, uranus b6.
SS 904L — Applicable Standards & Specifications
SS 904L is commonly supplied to ASTM A312, ASTM A213, ASTM A269, ASTM A789, ASME SA312, ASME SA213, ASME SA269, EN 10216-5.
Size Range
Outer Diameter: 1/4" NPS to 10" NPS (6.35mm to 273.1mm OD)
Wall Thickness: SCH 5S to SCH 80S
Chemical Composition (%)
| C | Mn | Si | Cr | Ni | Mo | Cu | P | S |
|---|---|---|---|---|---|---|---|---|
| 0.020 max | 2.00 max | 1.00 max | 19.0-23.0 | 23.0-28.0 | 4.0-5.0 | 1.0-2.0 | 0.045 max | 0.035 max |
Mechanical Properties
- Tensile Strength
- 490 MPa min
- Yield Strength
- 220 MPa min
- Elongation
- 35% min
- Hardness
- 90 HRB max
Physical Properties
- Density
- 7.95 g/cm3
- Melting Range
- 1350-1400 C
- Thermal Conductivity
- 12.2 W/m-K
- Electrical Resistivity
- 950 nOhm-m
- Specific Heat
- 460 J/kg-K
- Coeff. of Thermal Expansion
- 15.8 um/m-C
Corrosion Resistance
- Pitting Resistance (PREN)
- ~36
- Max Service Temp (Oxidizing)
- 450 C
- Intergranular Corrosion
- Highly resistant
- Stress Corrosion Cracking
- Excellent resistance
- General Corrosion Rate
- <0.01 mm/yr in dilute sulfuric acid
- Seawater Resistance
- Excellent
Applicable Standards
- ASTM A312 / ASME SA312
- ASTM B673 / ASME SB673
- ASTM B674 / ASME SB674
- DIN EN 10216-5
Applications
- Sulfuric acid handling and storage
- Phosphoric acid production
- Seawater cooling systems
- Bleaching equipment in pulp mills
- Organic acid processing
- Gas scrubbing systems
Industries Served
- Chemical Processing
- Fertilizer
- Pulp & Paper
- Marine
- Mining
Key Advantages
- Exceptional sulfuric acid corrosion resistance
- Outstanding pitting resistance (PREN ~36)
- Copper addition improves resistance to reducing acids
- Excellent SCC resistance due to high nickel content
- More economical than nickel alloys for many acid applications
Equivalent Grades
- ASTM
- N08904
- JIS
- SUS 890L
- Trade
- Uranus B6