Characteristic: Corrosion Resistance
Standard: ASME, ASTM, EN, UNS, GB, DIN, JIS
Certification: ISO, CE, ROHS
Payment Terms: T/T, L/C, Paypal, Western Union
SAE 904L Super Austenitic Stainless Steel belongs to low carbon high nickel, molybdenum austenitic stainless acid-resistant steel, has the very good activation and passivation shift ability, excellent corrosion resistance, rather than oxidizing acid such as sulfuric acid, acetic acid, formic acid, phosphoric acid have good corrosion resistance, in neutral chlorine ion medium has the very good pitting resistance, at the same time has good resistance to crevice corrosion and stress corrosion resistance.
SAE 904L Stainless Steel is suitable for various concentrations of sulfuric acid under 70℃, and the corrosion resistance of acetic acid and acetic acid and acetic acid is also good.
Super austenitic stainless steel 904L is a high alloy austenitic stainless steel with low carbon content. It is very resistant to corrosion in dilute sulphuric acid and is designed for harsh conditions.
Has the high chromium content and plenty of nickel content, the addition of copper makes it have strong ability to resist acid, especially for chloride clearance corrosion and stress corrosion cracking are highly resistant, not easy to appear, erosion and fracture pitting resistance slightly better than other steel grade, good machinability and weldability, can be used for pressure vessels
904L Stainless Steel: Main Component: 20Cr-24Ni-4.3Mo-1.5Cu
Physical and mechanical performance:
Density:8.24g/cm3. Strength of extension:σb≥520Mpa. Ductility:δ≥35%
904L Stainless Steel Corrosion Resistance:
Since the carbon content of 904L is very low (maximum 0.020%), there will be no carbon precipitation in the case of general heat treatment and welding. This eliminates the risk of intergranular corrosion after normal heat treatment and welding.
Because of the high chromium nickel content and the addition of copper, 904L can be passivated even in reduced conditions such as sulfuric acid and formic acid. High nickel content also has low corrosion velocity in active state.In pure sulfuric acid at a concentration of 0~98%, the temperature of 904L can reach up to 40c.
The corrosion resistance of pure phosphoric acid in the concentration range of 0~85% is very good. In industrial phosphoric acid produced by wet process, impurity has a strong influence on corrosion resistance.
Of all kinds of phosphoric acid, 904L is better than ordinary stainless steel. In the highly oxidized nitric acid, 904L has low corrosion resistance compared with the high alloying steel without molybdenum. In hydrochloric acid, the use of 904L is limited to a low concentration of 1-2%.In this concentration range.
The corrosion resistance of 904L is better than that of conventional stainless steel.904L steel has high corrosion resistance. Its anti - crevice corrosion resistance is also very good in chloride solution. The high nickel content of 904L reduces the corrosion rate at the pits and crevices.
Ordinary austenitic stainless steel when temperature is higher than 60 degrees Celsius, in a rich chloride environment sensitive to stress corrosion may be, by improving the nickel content of stainless steel, can reduce the sensitization. Due to high nickel content, 904L is highly resistant to stress corrosion cracking in the environment of chloride solution, concentrated hydroxide solution and hydrogen sulfide.
904L Stainless Steel Application:
Petroleum, petrochemical equipment, such as the reactor in petrochemical equipment.
The storage and transportation of sulfuric acid, such as heat exchanger, etc.
Power plant flue gas desulfurization device mainly USES the tower body of the absorber. Flue, door board, mole, spray system and so on.
Organic acid treatment system of scrubber and fan.
Seawater treatment plant, seawater heat exchanger, paper industry equipment, sulphuric acid, nitric acid equipment, acid, pharmaceutical industry and other chemical equipment, pressure vessel, food equipment.
Pharmaceutical factory: centrifuge, reactor, etc.
Plant food: soy sauce pot, cooking wine, salt shaker, equipment and dressing.
The strong corrosive medium of dilute sulphuric acid is the matching steel.
904L Application Matters Need Attention:
Like ordinary stainless steel, 904L can be welded in a variety of welding ways. The most commonly used welding methods are manual arc welding or inert gas shielded welding, the electrode or wire metal is based on the components of the parent material and the purity is higher, and the content of molybdenum is higher than that of the parent material. It is generally not necessary to heat before welding, but in the cold outdoor operation, to avoid the condensation of water vapor, the joints or adjacent areas can be heated evenly. Note that the local temperature should not exceed 100 degrees so as not to cause carbon agglomeration and cause intergranular corrosion. Small wire energy, continuous and fast welding rate are used for welding. After welding, it is generally not required to heat treatment. If heat treatment is required, it must be heated to 1100~1150 and quickly cooled.
The machining characteristics of 904L are similar to that of other austenitic stainless steels, and there is a tendency of adhesion and process hardening during processing. It is necessary to use the front Angle cemented carbide cutting tool, and the equipment and process should be used to reduce the hardening of the machine. Slow cutting speed and feed amount should be avoided during cutting.
Standard exporting package.
Original package or neutral package.
According to clients’ needs.
Shipped in 10-35 days after payment.
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Q: How long is the delivery time?
A: It depends on quantity. Usually, 10-35 working days.
Q: Can I get sample to check the quality?
A: Of course. We can supply sample, and free for some small value products.
Q: Do you provide OEM service?
A: Yes, we do. Customized design is available.
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Q: What certificate do your products have?
A： CE, ISO9001, RoHS, SGS, etc.