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Products Description

904L Stainless Steel Overview

904L stainless steel is a low-carbon, high-alloy austenitic stainless steel renowned for its exceptional corrosion resistance. Unlike conventional chromium-nickel stainless steels, 904L contains copper as an additional alloying element, which enhances its toughness, formability, and weldability. This non-stabilized high-alloy steel is particularly resistant to stress corrosion cracking (SCC) and crevice corrosion, making it suitable for highly corrosive environments.

Key Features of 904L Stainless Steel

Exceptional Corrosion Resistance: Resists sulfuric, phosphoric, and acetic acids, as well as chloride-containing environments.
High Alloy Content: Contains chromium, nickel, molybdenum, and copper for superior performance.
Excellent Toughness and Formability: Ideal for fabrication and welding.
Low Carbon Content: Reduces the risk of carbide precipitation during welding.

Chemical Composition (Weight %)

Element	Cr	Ni	Mo	Cu	C	Mn	Si	P	S	Fe
Percentage	19.0-23.0	23.0-28.0	4.0-5.0	1.0-2.0	≤0.02	≤2.00	≤1.00	≤0.045	≤0.035	Balance

Mechanical Properties

Property	Value
Tensile Strength	490 - 620 MPa
Yield Strength	220 MPa (min)
Elongation	35% (min)
Hardness (Rockwell)	≤95 HRB
Density	7.95 g/cm³

Common Applications

904L stainless steel is widely used in industries requiring high corrosion resistance and durability. Common applications include:

Seawater Cooling Equipment
Oil Refinery Components
Chemical Processing Equipment (for sulfuric, phosphoric, and acetic acids)
Gas Scrubbing Plants
Condenser Tubes
Control and Instrumentation
Heat Exchangers
Pulp and Paper Processing Equipment

Specifications and Dimensions

Below are the typical specifications and dimensions for 904L stainless steel round bars:

Standard Dimensions

Diameter (mm)	Length (mm)	Tolerance (mm)	Surface Finish
10 - 50	1000 - 6000	±0.1	Bright / Polished
50 - 100	1000 - 6000	±0.2	Bright / Polished
100 - 200	1000 - 6000	±0.3	Bright / Polished
200 - 300	1000 - 6000	±0.5	Bright / Polished

Available Standards

Standard	Description
ASTM A240	Standard specification for chromium and chromium-nickel stainless steel plate, sheet, and strip.
ASTM A276	Standard specification for stainless steel bars and shapes.
EN 1.4539	European standard equivalent to 904L.
UNS N08904	Unified Numbering System designation for 904L.

Advantages of 904L Stainless Steel

Superior Corrosion Resistance: Performs exceptionally well in acidic and chloride-rich environments.
Ease of Fabrication: Can be easily welded, machined, and formed.
Long Service Life: Ideal for applications requiring durability in harsh conditions.
Versatility: Suitable for a wide range of industrial applications.

Conclusion

904L stainless steel is a premium material designed for demanding environments where corrosion resistance and durability are critical. Its unique composition, including copper and molybdenum, ensures exceptional performance in industries such as chemical processing, oil and gas, and marine engineering. Whether for heat exchangers, condenser tubes, or chemical processing equipment, 904L stainless steel delivers unmatched reliability and longevity.

For custom dimensions or additional specifications, please contact us for further assistance!

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