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904L, 1.4539, N08904, Austenitic Pipe/Tube, Flanges, Fittings
904L is an austenitic stainless steel. In comparison to 316L, its molybdenum addition gives it superior resistance to localized attack (pitting and crevice corrosion) by chlorides and greater resistance reducing acids and in particular its copper addition gives it useful corrosion resistance to all concentrations of sulphuric acid. Its high alloying content also gives it greater resistance to chloride stress corrosion cracking, but it is still susceptible. Its low carbon content makes it resistant to sensitization by welding and which prevents intergranular corrosion.
It has applications in piping systems, pollution control equipment, heat exchangers, and bleaching systems
Composition
Nickel, 23–28%
Chromium, 19–23%
Carbon, 0.02% maximum
Copper, 1–2%
Molybdenum, 4–5%
Manganese, 2% maximum
Silicon, 1.0% maximum
Iron, (balance)
904L （1.4539） | ||||||||
Summary | 1.4539 (alloy 904L) is an austenitic special steel with high molybdenum content as well as addition of copper and extremely low carbon content. | |||||||
Standard Product Forms |
| |||||||
Chemical Composition Wt,% |
| Min | Max. |
| Min. | Max. | Min. | Max. |
Ni | 23 | 28 | Cu | 1.0 | 2.0 | C | 0.02 | |
Cr | 19 | 23 | Co |
|
| Si | 1.0 | |
Fe |
|
| Al |
|
| P | 0.04 | |
Mo | 4 | 5 | Ti |
|
| S | 0.03 | |
W |
|
| Mn |
| 2.0 | N |
| |
Physical Constants | Density,g/ | |||||||
Melting Range,℃ | ||||||||
Typical Mechanical Properties | Elastic Modulus (Gpa) | 200 | ||||||
Mean Co-eff of Thermal Expansion (μm/m/℃) | 0-100℃ | 15 | ||||||
0-315℃ |
| |||||||
0-538℃ |
| |||||||
Thermal Conductivity (W/m.k) | At 20℃ | 13 | ||||||
At 500℃ |
| |||||||
Specific Heat 0-100 ℃ (J/Kg.K) | 500 | |||||||
Elec Resistivity (nΩ.m) | 850 | |||||||
Tensile Strength (Mpa) min | 490 | |||||||
Yield Stregth 0.2% Proof (Mpa) min | 220 | |||||||
Elongation (% in 50 MM) min | 35 |
8.24