446 vs 430 Stainless Steel: Ferritic High-Temp Specialists

 

How do their chemical compositions differ?​

430 has 16-18% chromium, 0.12% max carbon, and no nickel. 446 boosts chromium to 23-27%, keeps carbon ≤0.20%, and adds silicon (1.5% max), which enhances high-temperature oxidation resistance.​

 

Which performs better at extreme temperatures?​

446 thrives in continuous use up to 1150°C, resisting oxidation and scaling far better than 430, which tops out around 760°C. 446 is ideal for furnace linings and kiln components in high-heat industrial settings.​

 

How do they compare in corrosion resistance?​

430 offers better general corrosion resistance in mild, room-temperature environments like indoor settings and fresh water. 446 resists high-temperature corrosion and sulfidation well but is less effective in moist, low-temperature conditions.​

 

What about their fabrication properties?​

430 is more formable and easier to machine than 446, making it suitable for simple shapes like appliance trim. 446 is harder to weld due to high chromium, requiring preheating and post-weld annealing to avoid brittleness.​

 

Where are 446 and 430 commonly used?​

446 is used in furnace linings, burner parts, and high-temperature industrial ovens. 430 finds applications in appliance parts, automotive trim, and architectural components where cost and moderate corrosion resistance matter.