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Description
Chemical Composition and Mechanical Properties of 904L Stainless Steel
904L stainless steel is a high-alloy austenitic stainless steel with the following composition:
| Element | Percentage |
|---|---|
| Chromium | 19-23% |
| Nickel | 23-28% |
| Molybdenum | 4-5% |
| Copper | 1-2% |
| Carbon (max) | 0.020% |
Mechanical Properties:
| Property | Value |
|---|---|
| Tensile Strength | 490 MPa (71.1 ksi) |
| Yield Strength | 220 MPa (31.9 ksi) |
| Elongation | 35% |
| Hardness | 70-90 HRB |
Corrosion Resistance: The Hallmark of 904L Stainless Steel
904L offers superior corrosion resistance compared to conventional austenitic grades:
- Excellent resistance to pitting and crevice corrosion in chloride environments
- High resistance to stress corrosion cracking
- Superior performance in sulfuric acid across all concentrations
- Good resistance to phosphoric and acetic acids
Applications of 904L Stainless Steel Across Industries
904L stainless steel finds extensive use in:
- Oil and gas industry: Subsea pipelines, refineries, gas plants
- Chemical processing: Heat exchangers, storage tanks, reactors
- Pulp and paper: Bleaching systems, digesters
- Marine applications: Seawater cooling equipment, offshore platforms
- Pharmaceutical production
- Food processing equipment
- Pollution control devices
Manufacturing Process and Available Forms
904L is typically produced through controlled rolling processes. Available forms include:
- Plates
- Coils
- Pipes and tubes
- Fittings and flanges
Welding and Fabrication Considerations for 904L Stainless Steel
904L has excellent weldability:
- Can be welded using standard fusion and resistance welding methods
- Low carbon content minimizes risk of intergranular corrosion during welding
- Filler metals should match or exceed the alloy content of the base metal
Comparison of 904L with Other Austenitic Stainless Steel Grades
| Grade | Pitting Resistance Equivalent Number (PREN) | Corrosion Resistance |
|---|---|---|
| 904L | 35-36 | Excellent |
| 316L | 24-26 | Good |
| 317L | 30-32 | Very Good |
Cost-Effectiveness and Long-Term Benefits of 904L Stainless Steel
While 904L has a higher initial cost compared to conventional grades, it offers:
- Extended service life in harsh environments
- Reduced maintenance and replacement costs
- Improved safety and reliability in critical applications
At HL Steel Company, we provide high-quality 904L stainless steel products, ensuring optimal performance and cost-effectiveness for your industrial applications.
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