首页 > Products > stainless steel coil/strip > 904L Stainless steel coil
Product Introduction：
904L belongs to super austenitic stainless steel is a low carbon high nickel, molybdenum austenitic stainless acid resistant steel, has a good activation - passivation transformation ability, excellent corrosion resistance.In a non oxidizing acid such as sulfuric acid has good corrosion resistance, acetic acid, formic acid, phosphoric acid, has good resistance to pitting corrosion of chlorine ions in the neutral medium.
At the same time, it has good resistance to crevice corrosion and stress corrosion resistance. The utility model is suitable for various concentrations of sulfuric acid at 70 DEG C, and the corrosion resistance of acetic acid, formic acid and acetic acid mixed with acetic acid at any temperature and at any temperature is good.
Chemical Composition
Grade （材质） | C(%) （碳） | Si(%) （硅） | Mn(%) （锰） | P(%) （磷） | S(%) （硫） | Cr(%) （铬） | Ni(%) （镍） | Mo(%) （钼） | Cu(%) （铜） |
904L | ≤0.02 | ≤1.0 | ≤2.0 | ≤0.045 | ≤0.035 | 19.0-23.0 | 23.0-28.0 | 4.0-5.0 | 1.0-2.0 |
Mechanical property
Grade （材质） | tensile strength Mpa （抗拉强度） | Yield Strength Mpa （屈服强度） | rate of reduction in area (%) （断面收缩率） | Density (g/cm3) （密度） |
904L | ≥490 | ≥216 | --- | 8.0 |
Specifications
Technical （工艺） | Thickness （厚度） | Width （宽度） | Finish （表面） | Origin （产地） |
Cold rolled | 0.8mm-3.0mm | Standard: 1219mm 1500mm Special:can be ordered | 2B | TISCO / Outokumpu / Japan etc
|
Hot rolled | 3,0mm-350mm | Standard: 1500mm 1800mm 2000mm Special:can be ordered | No.1 | TISCO / Outokumpu / Japan etc
|
Applications
1) Petroleum, petrochemical equipment, such as petrochemical equipment in the reactor, etc..
2) Sulfuric acid storage and transportation equipment, such as heat ex changers, etc..
3) power plant flue gas desulfurization device, the main use of the parts are: absorption tower body, flue, door panels, internal parts, spray systems, etc..
4) organic acid treatment system of scrubber and fan.
5) 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.
6) Pharmaceutical Plants: centrifuges, reactors, etc..
7) plant food: cans of soy sauce, cooking wine, salt, and dressing equipment.
In dilute sulfuric acid, strong corrosive medium is 904L steel.
Different Production Standards
Grade （材质） 904L | GB （国标） | ASTM （美标） | DIN （欧标） | JIS （日标） |
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.
High nickel content in the active state also has a lower corrosion rate. 0~98% in the concentration range of pure sulfuric acid, the use of 904L temperature can be as high as 40 degrees celsius.
The corrosion resistance of pure phosphoric acid in 0~85% concentration range is very good. In the industrial phosphoric acid produced by wet process, impurities have a strong influence on corrosion resistance.
In all kinds of phosphoric acid, the corrosion resistance of 904L is better than that of ordinary stainless steel.
In hydrochloric acid, the use of 904L is limited to a lower 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 resistance to pitting corrosion. The crevice corrosion resistance of chloride solution is also very good. The high nickel content of 904L reduces the corrosion rate in the pits and crevices.
Due to the high nickel content, 904L is highly resistant to stress corrosion cracking in chloride solution, concentrated hydroxide solution and hydrogen sulfide rich environment.
