904L super austenitic stainless steel finds its origin from a French company named H·S. it’s an acid resistant stainless steel containing low carbon, and high-nickel & molybdenum. Type 904L features good activation-passivation conversion ability, excellent corrosion resistance, which is especially pronounced in non-oxidizing acids such as sulfuric acid, acetic acid, formic acid, and phosphoric acid. Its pitting resistance is excellent when used for neutral chloride-containing media. Grade 904L is not only resistant to crevice corrosion and stress corrosion, suitable for sulfuric acid of various concentrations below 70 °C, it is also resistant to corrosion in acetic acid, mixture of formic acid and acetic acid at any concentration and at any temperature under normal pressure. 904L is a completely austenitic structure, insensitive to the precipitation of ferrite and α phase, compared with general austenitic stainless steel which has a high molybdenum content.
Chemical Composition
| Grade | C(%) | Si(%) | Mn(%) | P(%) | S(%) | Cr(%) | Ni(%) | Mo(%) | Cu(%) |
| 904L | ≤0.02 | ≤1.0 | ≤2.0 | ≤0.045 | ≤0.035 | 19.0-23.0 | 23.0-28.0 | 4.0-5.0 | 1.0-2. |
Mechanical property
| Grade | Tensile strength Mpa | Yield Strength Mpa | rate of reduction in area (%) | Density (g/cm3) |
| 904L | ≥490 | ≥216 | --- | 8 |
Applications
Petroleum, petrochemical equipment, such as petrochemical equipment in the reactor, etc..
Sulfuric acid storage and transportation equipment, such as heat exchangers, etc..
power plant flue gas desulfurization device, the main use of the parts are: absorption tower body, flue, door panels, internal parts, spray systems, etc..
organic acid treatment system of scrubber and fan.
sea water treatment equipment, sea water heat exchanger, paper industry equipment, sulfuric acid, nitric acid equipment, acid making, pharmaceutical industry and other chemical equipment, pressure vessels, food equipment.
Pharmaceutical Plants: centrifuges, reactors, etc..
plant food: cans of soy sauce, cooking wine, salt, and dressing equipment. In dilute sulfuric acid, strong corrosive medium is 904L steel.
Mechanical propertiesThe Different Standards
| Grade | GB | ASTM | DIN | JIS |
| 904L | 20Cr-24Ni-4.3Mo-1.5Cu | 904L | 1.4539 | SUS890L |
More about for 904L
Because 904L is a low carbon content (maximum 0.020%), so in the general case of heat treatment and welding, there will be no carbide precipitation, this eliminates the risk of heat treatment and welding in intergranular corrosion.
Due to the high content of chromium, nickel and molybdenum, and the addition of copper, 904L can also be passivated even in reduced environments, such as sulfuric acid and formic acid.
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