444 stainless steel is a superior ferritic stainless steel containing molybdenum (Mo) and stabilizing elements (Nb/Ti). It offers:
Excellent resistance to chloride‑induced corrosion
Strong pitting and crevice corrosion resistance
High heat resistance
Good weldability and formability
Stable performance in hot‑water and heat‑exchange environments
Because of its enhanced corrosion resistance, 444 is widely used as a high‑end alternative to 316L in certain applications, especially where chloride exposure is significant.
🟧 Key Features
Superior resistance to pitting and crevice corrosion
Excellent performance in chloride‑rich environments
High heat resistance and oxidation resistance
Stabilized with Nb/Ti for improved weldability
Low nickel content for cost stability
Ideal for long‑term hot‑water and heat‑exchange systems
🟧 Standards
ASTM A240 / A480
JIS G4304 / G4305 (SUS444)
EN 10088‑2 (1.4521)
GB/T 3280
🟧 Chemical Composition (Typical)
Element
444 (%)
C
≤0.025
Cr
17.5–19.5
Ni
≤1.0
Mo
1.75–2.50
Mn
≤1.0
Si
≤1.0
Nb / Ti
Stabilized
Fe
Balance
Note: The molybdenum content is the key factor behind 444’s superior resistance to chloride corrosion and pitting.
