904L
Super-austenitic stainless steel with high nickel, molybdenum and copper for aggressive corrosion service.
Material overview
The Nickel-Based Alloys catalog describes 904L as follows: Super-austenitic stainless steel with high nickel, molybdenum and copper for aggressive corrosion service. Reviewers should evaluate Excellent resistance to sulfuric and phosphoric acids and seawater and resists chloride pitting and stress corrosion. The grade record lists Acid plants, seawater equipment, pulp and paper, gas washing, and chemical and pharmaceutical equipment among typical applications. The dataset currently includes 14 property records covering chemical composition, mechanical properties, and physical properties. Standards and form records reference B625, B649, A240, and GB/T 15007 and Plate, Bar / Rod, and Seamless Pipe / Tube. Final supply conditions remain subject to specification, inspection, and export-control review.
Key characteristics
- Excellent resistance to sulfuric and phosphoric acids and seawater
- resists chloride pitting and stress corrosion
Typical applications
- Acid plants
- seawater equipment
- pulp and paper
- gas washing
- chemical and pharmaceutical equipment
Grade names and equivalents
Technical properties
Typical values are for reference only. Final chemistry, mechanical properties, heat treatment, dimensions, inspection, and documentation are confirmed against the applicable specification and MTC/COA before order acceptance.
Chemical composition
| Property | Value | Unit | Condition / standard |
|---|---|---|---|
| Fe | balance | wt% | Typical value |
| Ni | 23.0-28.0 | wt% | Typical value |
| Cr | 19.0-23.0 | wt% | Typical value |
| Mo | 4.0-5.0 | wt% | Typical value |
| Cu | 1.0-2.0 | wt% | Typical value |
| C | 0.02 max | wt% | Typical value |
| Mn | 2.0 max | wt% | Typical value |
| Si | 1.0 max | wt% | Typical value |
Mechanical properties
| Property | Value | Unit | Condition / standard |
|---|---|---|---|
| Tensile strength | min 490 | MPa | Annealed |
| Yield strength 0.2% | min 216 | MPa | Annealed |
| Elongation | min 35 | % | Annealed |
| Hardness | max 187 HB | HB | Annealed |
Physical properties
| Property | Value | Unit | Condition / standard |
|---|---|---|---|
| Density | 8 | g/cm3 | Typical |
| Melting range | 1300-1390 | C | Typical |
Standards and specifications
Forms, applications, and capabilities
Product forms
Industries
- Petrochemical & Chemical
- Industry
- Industry
- Industry