904L is an austenitic grade stainless steel with low carbon and higher resistance to stress and crevice corrosion cracking as compared to AISI 316 & AISI 317 stainless steel grades. Due to addition of Copper, it has increased resistance to phosphoric, sulphuric and hydrochloric acid concentration. It is sometimes referred to as super austenitic stainless steel due to superiority over other 300 series austenitic steel grades. 904L is also resistant to chloride and sea water attack. 904L is primarily used in production and transport of phosphoric acid as well as in environment containing concentrations of phosphoric acid or phosphorous gas.
Download 904L Data Sheet
904L Properties
904L Chemical Composition |
| Elements |
Carbon |
Manganese |
Phosphorus |
Sulphur |
Silicon |
Chromium |
Nickel |
Molybdenum |
Nitrogen |
Copper |
| Compositions by % |
0.02 max |
2.00 |
0.045 |
0.035 |
1.00 |
19.0 - 23.0 |
23.0 - 28.0 |
4.0 - 5.0 |
0.1 |
1.0 - 2.0 |
904L Mechanical Properties |
| Tensile Strength, min |
Yield Strength, min |
Elongation, min |
Reduction of Area, min |
Hardness |
| 490 MPa |
220 MPa |
35% |
|
|
904L Physical Properties |
| Elastic Modulus |
Mean Co-Efficient of Expansion (0-100ºC) |
Thermal Conductivity (At 20ºC) |
Specific Heat (0-100ºC) |
Electric Resistivity |
| 190 GPa |
15 µm/m/ºC |
11.5 W/m.K |
500 J/Kg.K |
952 nΩ.m |
904L Density
904L Melting Point
904L Stainless Steel has a melting range between 1300 - 1390 °C (2372 - 2534°F)
904L Heat Treatment
904L has austenitic stainless steel chemistry and can be strengthened by solution annealing at 1090 to 1175ºC, followed by rapid water quenching. 904L can be hardened using heat treatment.
904L Machining
Grade 904L stainless steels are high purity steels with low sulfur content. They can be machined using any standard methods. These grades can be readily bent to a small radius under cold conditions. Although subsequent annealing is not required in most cases, it should be carried out when the fabrication is performed under severe stress corrosion cracking conditions.
904L Alternative Grades
| 316L |
With Lower corrosion resistance and cost effective |
| 6Mo Alloys |
With higher resistance to pitting and crevice corrosion |
| Duplex 2205 |
With similar corrosion resistance, higher mechanical strength and lower cost but not suitable for temperature above 300ºC |
904L Equivalent Grade Designations
| AISI |
UNS |
DIN / EN / Werkstoff Number |
Euronorm / DIN Name |
Brand Name |
| 904L |
N08904 |
1.4539 |
X1-Ni-Cr-Mo-Cu-25-20-5 |
URANUS® B6 |
904L Products
- Seamless Pipes and Tubes
- Welded Pipes and Tubes
- LSAW Pipes
- Butt Weld Pipe Fittings
- Socket Weld Pipe Fittings
- Threaded Pipe Fittings
- Forged Pipe Fittings
- Tube Fittings
- Forged Flanges
- Plates
- Bars (Round, Square, Hexagon, Flat Rectangular)
- Wires
- Welding Tig Wire & Electrode
- Wire Mesh
- Perforated Sheets & Plates
904L Product Specifications
| Seamless / Welded Pipe |
ASTM A312 TP 904L |
| Seamless / Welded Tubing |
ASTM A269 TP 904L |
| Bar / Rod |
ASTM A276 / A479 TP 904L |
| Forging |
ASTM A182 F904L |
| Sheet / Plate |
ASTM A240 UNS N08904 |
| Welding Consumable |
AWS A5.9 ER385 |