2205 is a duplex (austenitic-ferritic) stainless steel offering:
Superior strength (2x 316L)
Excellent corrosion resistance
Good weldability
High stress corrosion cracking resistance
Key standards: ASTM A240, UNS S32205/S31803, EN 1.4462
Key Specifications
Property Value
Density 7.8 g/cm³
Melting Range 1380-1450°C (2516-2642°F)
Thermal Conductivity 19 W/m·K
Electrical Resistivity 0.80 μΩ·m
Purchasing Considerations
Specify ASTM A240 certification
Request ferrite content verification (30-50%)
Consider surface finish requirements
Verify impact test results for low temp applications
Common Applications
Oil & gas industry (pipelines, pressure vessels)
Chemical processing equipment
Marine and offshore applications
Desalination plants
Pulp and paper industry

904L (UNS N08904) is a super austenitic stainless steel offering:
Exceptional corrosion resistance (superior to 316L)
High molybdenum content (4-5%)
Non-magnetic (austenitic structure)
Excellent weldability and formability
Key standards: ASTM A240 (sheet), EN 1.4539, UNS N08904
Key Specifications
Property Value
Density 8.0 g/cm³
Melting Range 1300-1390°C (2372-2534°F)
Thermal Conductivity 12.9 W/m·K
Electrical Resistivity 0.85 μΩ·m
Common Applications
Chemical processing equipment
Pharmaceutical and food processing
Seawater and marine applications
Oil & gas industry (sour gas service)
Pollution control scrubbers

403 stainless steel is a martensitic stainless steel (12% chromium alloy) primarily used in high-temperature applications. Key characteristics include:
Good corrosion resistance (moderate, not as strong as 304/316)
High strength and hardness (can be heat treated)
Magnetic properties (unlike austenitic grades)
Excellent machinability (better than most stainless steels)
Common Applications
Turbine blades and steam generator parts
Jet engine components
Fasteners and valves
Cutlery and surgical instruments
Nuclear reactor components