904L Stainless Steel pipe

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

Product Description

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.

Product Application

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:

Welding property:

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.

Machining property:

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.

Packaging and Delivery

• Standard  exporting package.

• Original  package or neutral package.

• According  to clients’ needs.

• Shipped  in 10-35 days after payment.

FAQ

Price
 Q: How can I get the price?
 A: You can contact us through sending inquiry, or get  price list by Email.

Delivery
 Q: How long is the delivery time?
 A: It depends on quantity. Usually, 10-35 working  days.

Sample
 Q: Can I get sample to check the quality?
 A: Of course. We can supply sample, and free for some  small value products.

OEM
 Q: Do you provide OEM service?
 A: Yes, we do. Customized design is available.

Payment
 Q: What is your payment term?
 A: L/C, T/T, Paypal, Western Union, etc.

Certificate
 Q: What certificate do your products have?
 A： CE, ISO9001, RoHS, SGS, etc.