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Stainless Steel - Grade 409CB / 1.4512
Description
Stainless Steel Grade 409CB/1.4512 is a stabilized ferritic stainless steel with excellent oxidation and corrosion resistance. This grade contains niobium, which enhances its strength and weldability. It is particularly suited for applications requiring high-temperature resistance and good mechanical properties.
Chemical Composition
- Chromium (Cr): 10.5 - 11.75%
- Nickel (Ni): ≤ 0.5%
- Silicon (Si):≤ 1.0%
- Manganese (Mn): ≤ 1.0%
- Niobium (Nb): 0.3 - 0.6%
- Carbon (C): ≤ 0.03%
- Phosphorus (P): ≤ 0.04%
- Sulfur (S): ≤ 0.02%
- Iron (Fe): Balance
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Mechanical Properties
- Tensile Strength: 380 - 450 MPa
- Yield Strength: 200 - 280 MPa
- Elongation: 20 - 25%
- Hardness: 65 - 95 HRB
Thermal & Physical Properties
- Density: 7.75 g/cm³
- Melting Point: 1450°C (2642°F)
- Thermal Conductivity: 25 W/m•K at 20°C
- Specific Heat: 460 J/kg•K at 20°C
- Coefficient of Thermal Expansion: 11.0 µm/m•K from 20°C to 100°C
- Electrical Resistivity: 0.60 µΩ•m at 20°C
Other Designations
- UNS:S40920
- EN: 1.4512
- JIS: SUS 409L
Fabrication and Heat Treatment
- Welding: Grade 409CB/1.4512 is readily weldable using conventional welding techniques. Preheating is not typically required, and post-weld annealing is necessary only for high-stress applications.
- Heat Treatment: Annealing should be performed at 760-815°C (1400-1500°F) followed by air cooling. This process relieves stresses and restores ductility.
- Forming: This grade can be formed using standard methods. Its formability is similar to other ferritic stainless steels.
Applications
- Automotive Exhaust Systems: Widely used for catalytic converters, mufflers, and tailpipes due to its resistance to high temperatures and corrosion.
- Construction: Suitable for structural components and building facades.
- Industrial Equipment: Used in equipment subjected to high-temperature environments, such as furnaces and heat exchangers.
- Food Processing: Ideal for components in food processing equipment where high strength and corrosion resistance are essential.
- Petrochemical: Suitable for storage tanks, heat exchangers, and other equipment in the oil and gas industry.
Supplied Forms
- Bars:
- Coils
Features
- Oxidation Resistance: Excellent resistance to oxidation, particularly at elevated temperatures.
- Corrosion Resistance: Good resistance to corrosion in mildly corrosive environments.
- High Temperature Strength: Maintains strength and stability at high temperatures, making it ideal for exhaust systems and similar applications.
- Weldability: Enhanced weldability due to the presence of niobium.
- Cost-Effective: Lower cost compared to austenitic stainless steels while providing sufficient performance for many applications.
- Formability: Can be easily formed and fabricated using standard methods.