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904L Stainless Steel
Products Description
904L super austenitic stainless steel (00Cr20Ni25Mo4.5Cu; UNS: N08904; EN1.4539) is a low-carbon, high-alloy austenitic stainless steel designed specifically for harsh corrosion conditions. It has excellent corrosion resistance in dilute sulfuric acid and features high chromium content, sufficient nickel content, and added copper for strong acid resistance. It shows exceptional resistance to chloride pitting and stress corrosion cracking with minimal damage or cracking. Additionally, it offers superior machinability and weldability, making it suitable for pressure vessels.
1.4539 Material Equivalent Grades
|
DIN |
EN |
ASTM /AlSI |
UNS |
GB |
|
1. 4539 |
X1NiCrMoCu25-20-5 |
904L |
N08904 |
00Cr20Ni25Mo4. 5Cu |
|
1. 4547 |
X1CrNiMoCuN20-18-7 |
|
S31254 |
|
1.4539(X1NiCrMoCu25-20-5) Chemical Composition %
| C | Cr | Cu | Mn | Mo | Ni | P | S | Si |
| Max | Max | Max | Max | Max | ||||
| 0.02 | 19.0-23.0 | 1.0-2.0 | 2.0 | 4.0-5.0 | 23.0-28.0 | 0.045 | 0.035 | 1.0 |
1.4539/904l Physical and mechanical properties:
Density: 8.0g/cm3. Tensile strength: σ B ≥ 520Mpa. Elongation rate: δ≥ 35%.
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Corrosion resistance of 904L/DIN 1.4539/X1NiCrMoCu25-20-5 stainless steel:
Due to the low carbon content of 904L/DIN 1.4539/X1NiCrMoCu25-20-5 (maximum 0.020%), there will be no carbide precipitation under general heat treatment and welding conditions. This eliminates the risk of intergranular corrosion that occurs after general heat treatment and welding. Due to its high chromium nickel molybdenum content and the addition of copper, 904L can be passivated even in reducing environments such as sulfuric acid and formic acid.
The high nickel content results in a lower corrosion rate even in the active state. In pure sulfuric acid with a concentration range of 0-98%, the usage temperature of 904L can reach up to 40 degrees Celsius. In pure phosphoric acid with a concentration range of 0-85%, its corrosion resistance is very good.
Impurities have a strong impact on the corrosion resistance of industrial phosphoric acid produced by wet process technology. Among all types of phosphoric acid, 904L/DIN 1.4539/X1NiCrMoCu25-20-5 has better corrosion resistance than ordinary stainless steel. In highly oxidizing nitric acid, 904L has lower corrosion resistance compared to high alloyed steel grades without molybdenum.
In hydrochloric acid, the use of 904L is limited to lower concentrations of 1-2%. Within this concentration range. The corrosion resistance of 904L is better than that of conventional stainless steel. 904L/DIN 1.4539/X1NiCrMoCu25-20-5 steel has high resistance to pitting corrosion.
Its resistance to crevice corrosion is also very good in chloride solutions. The high nickel content of 904L(DIN 1.4539/X1NiCrMoCu25-20-5) reduces the corrosion rate in pits and crevices. Ordinary austenitic stainless steel may be sensitive to stress corrosion in an environment rich in chloride at temperatures above 60 degrees Celsius. By increasing the nickel content of the stainless steel, this sensitization can be reduced. Due to its high nickel content, 904L exhibits high resistance to stress corrosion cracking in chloride solutions, concentrated hydroxide solutions, and environments rich in hydrogen sulfide.
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