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.
Production Standards
|
Grade
|
GB
|
ASTM
|
DIN
|
JIS
|
|
904L
|
20Cr-24Ni-4.3Mo-1.5Cu
|
904L
|
1.4539
|
SUS890L
|
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
|
1.0-2.0
|
Mechanical property
|
Grade
|
TS
Mpa
|
YS
Mpa
|
Rate of reduction in area
(%)
|
Density
(g/cm3)
|
|
904L
|
≥490
|
≥216
|
---
|
8.0
|
Specifications
|
Available technical
|
Available thickness
（mm）
|
Available width
（mm）
|
Available finish
|
Available origin
|
|
Cold rolled
|
0.8-3.0
|
Standard: 1219 1500
Special:can be ordered
|
2B
|
TISCO / Outokumpu / Japan etc
|
|
Hot rolled
|
3.0-350
|
Standard: 1500 1800 2000
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.
