Austenitic alloy steel plate 904L is a high-performance austenitic stainless steel with excellent corrosion resistance, especially in strong acid environments. It is widely used in various industries due to its unique chemical composition and properties. Here is a detailed introduction to 904L austenitic alloy steel plate:

1. Chemical Composition

The key chemical composition (typical values, wt%) of 904L is as follows:

 

Chromium (Cr): 19.0-23.0% (forms a passive oxide film to resist corrosion)

Nickel (Ni): 23.0-28.0% (stabilizes the austenitic structure, improves toughness and corrosion resistance)

Molybdenum (Mo): 4.0-5.0% (enhances resistance to pitting and crevice corrosion, especially in chloride environments)

Copper (Cu): 1.0-2.0% (improves resistance to sulfuric acid and other reducing acids)

Carbon (C): ≤0.02% (low carbon content reduces sensitization and intergranular corrosion risk)

Silicon (Si): ≤1.0%

Manganese (Mn): ≤2.0%

Phosphorus (P): ≤0.045%

Sulfur (S): ≤0.035%

 

The high content of nickel, molybdenum, and copper makes 904L far superior to ordinary austenitic stainless steels (such as 304, 316) in corrosion resistance, especially in harsh environments containing acids, chlorides, and sulfides.

2. Mechanical Properties

Tensile strength: ≥550 MPa

Yield strength (0.2% offset): ≥220 MPa

Elongation: ≥35%

Hardness: ≤220 HB

 

It has good toughness and ductility, maintaining stable mechanical properties over a wide temperature range (from low temperatures to moderate high temperatures).

3. Key Properties

Excellent corrosion resistance:

Resists reducing acids (e.g., sulfuric acid, phosphoric acid) and oxidizing acids (e.g., nitric acid) at moderate concentrations and temperatures.

Outstanding resistance to pitting, crevice corrosion, and stress corrosion cracking in chloride-rich environments (e.g., seawater, brine).

Good processability:

Weldable by conventional methods (e.g., TIG, MIG welding) without significant loss of corrosion resistance; post-weld heat treatment is generally not required.

Suitable for cold working (e.g., bending, stamping) and hot working (e.g., forging, rolling) due to its good ductility.

High purity:
Low impurity content (e.g., carbon, sulfur) ensures uniform structure and stable performance.

 

 

 

 

 

 

 

 

 

 

 

 

 

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