Ferritic
What is Ferrite in Metallurgy?
Ferrite refers to the body-centred cubic (BCC) form of iron that remains stable at room temperature. It is a magnetic phase of iron that forms the structural basis of ferritic stainless steels. This phase imparts properties like magnetism, moderate strength, and excellent resistance to oxidation and stress corrosion cracking.
What is Ferritic Stainless Steel?
Ferritic stainless steel belongs to the 400 series family and contains chromium (typically 10.5%-18%) with little or no nickel. These stainless steels retain a ferritic structure across all temperatures and are magnetic. It is known for its good corrosion resistance in mildly corrosive environments. Ferritic grades are also valued for their high thermal conductivity, low thermal expansion, and excellent oxidation resistance.
Key Properties and Applications of Ferritic Grades
Properties:
- Magnetic in nature
- Good corrosion and oxidation resistance
- High thermal conductivity and dimensional stability
- Excellent resistance to stress corrosion cracking
- Cost-effective (low or no nickel content)
Applications:
- Automotive components like exhaust systems, catalytic converters, and trim
- Washing machine drums and kitchen sinks
- Household appliances and utensils
- Roofing and cladding in architectural projects
- Elevator doors and panels
- Industrial applications like furnaces and chemical tanks