Also 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, din 1.4539, en 1.4539
Stainless Steel 904L Seamless Pipes & Tubes
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.
Size Range
1/4" NPS to 10" NPS (6.35mm to 273.1mm OD)
Wall Thickness
SCH 5S to SCH 80S
Standards
4 specs
Chemical Composition (% by weight)
| 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 (Minimum at Room Temperature)
| Tensile Strength | Yield Strength | Elongation | Hardness |
|---|---|---|---|
| 490 MPa min | 220 MPa min | 35% min | 90 HRB max |
Physical Properties - SS 904L
| Density | Melting Range | Thermal Conductivity | Electrical Resistivity | Specific Heat | Coeff. of Thermal Expansion |
|---|---|---|---|---|---|
| 7.95 g/cm3 | 1350-1400 C | 12.2 W/m-K | 950 nOhm-m | 460 J/kg-K | 15.8 um/m-C |
Corrosion Resistance - SS 904L
| Property | Value |
|---|---|
| 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 |
Equivalent International Grades
| ASTM | JIS | Trade |
|---|---|---|
| N08904 | SUS 890L | Uranus B6 |
SS 904L vs Comparable Grades
| Grade | UNS | Tensile | Yield | PREN | Max Temp |
|---|---|---|---|---|---|
| SS 317LAustenitic Stainless Steel | S31703 | 515 MPa min | 205 MPa min | ~29 | 870 C |
| SS 316 / 316LAustenitic Stainless Steel | S31600 / S31603 | 515 / 485 MPa min | 205 / 170 MPa min | ~24 | 870 C |
| Alloy 825Nickel-Iron-Chromium-Molybdenum Alloy | N08825 | 586 MPa min | 241 MPa min | ~31 | 540 C |
Applicable Standards
Applications
Key Advantages of SS 904L
SS 904L Applications by Region
Middle East (UAE, Saudi Arabia, Qatar, Oman, Kuwait)
Specified for acid handling systems, seawater applications, and petrochemical plants in UAE, Saudi Arabia, and Qatar.
Europe (Germany, UK, Norway, Netherlands, Italy)
Standard for fertilizer plants, chemical processing, and marine applications in Germany, Netherlands, and Scandinavia.
United States
Used in chemical processing, fertilizer production, and marine applications.
Frequently Asked Questions about SS 904L Seamless Pipes & Tubes
Quick Specifications
1/4" NPS to 10" NPS (6.35mm to 273.1mm OD)
SCH 5S to SCH 80S
Industries Served
Related Grades
Compare With
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Stancor Tubular Products supplies SS 904L seamless pipes & tubes across the GCC, India, Europe and the USA. Contact our sales team for competitive pricing, fast delivery, and full material certification.
