430 vs 446 Stainless Steel: Ferritic High-Chromium Options

 

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 small amounts of silicon, enhancing high-temperature oxidation resistance.​

 

Which performs better at high temperatures?​

446 excels in continuous use up to 980°C, resisting scaling and oxidation far better than 430, which tops out around 760°C. 446 is ideal for furnace linings, while 430 suits moderate heat applications.​

 

How do they compare in corrosion resistance?​

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

 

What about their fabrication properties?​

430 is more formable, easier to bend and stamp into simple shapes. 446 is harder to weld due to high chromium, requiring preheating and post-weld annealing, while 430 welds easily with standard techniques.​

 

Where are 430 and 446 commonly applied?​

430 is used in appliance trim, automotive accents, and mild chemical equipment. 446 finds applications in furnace linings, burner parts, and high-temperature industrial ovens.