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SUS444 stainless steel sheet, also known as AISI 444 or EN 1.4521, is a dual-stabilized ferritic stainless steel containing 2% molybdenum. This grade offers excellent corrosion resistance comparable to austenitic grades 4401/4404, with higher strength values due to molybdenum alloying.
Material Specifications
Grade 1.4521 is equivalent to European code 1.4521 and American standard ASTM 444. Stabilization with both titanium and niobium ensures a fully stabilized microstructure with improved surface properties and elongation values up to 30% (A80).
Key Applications
Food processing equipment
Brewery and wine making equipment
Hot-water tanks and heat exchangers
Automotive components
Solar water heaters
Drinking water pipes and environments
Corrosion Resistance
As a molybdenum-alloyed ferritic steel, grade 1.4521 offers localized corrosion resistance close to grade 1.4404/AISI 316. The nickel-free ferritic structure provides excellent resistance to chloride-induced stress corrosion cracking.
Formability & Machining
1.4521 can be readily cold-formed by all standard processes and is particularly suitable for deep drawing. The deep drawability is comparable to deep drawing quality carbon steels. The lower work hardening rate makes it less suitable for stretch forming but easier to cold form and machine.
Welding Characteristics
With low carbon and nitrogen contents and dual stabilization, this ferritic steel offers better weldability than many traditional ferritic steels. Grain growth in the HAZ must be controlled by minimizing heat input, with austenitic fillers typically used.
Chemical Composition (Typical)
Element
Content (%)
Carbon
0.025 max
Manganese
1.00 max
Silicon
0.60
Chromium
17.50-19.50
Nickel
01.00 max
Molybdenum
1.75-2.50
Titanium + Columbium
0.20 + 4x (C+N) min - 0.80 max
Phosphorus
0.040 max
Sulfur
0.030 max
Iron
Balance
Physical Properties
Property
Value
Density
0.28 lbs/in³ (7.75 g/cm³)
Electrical Resistivity
22.50 microhm-in (57 microhm-cm) at 68°F (20°C)
Specific Heat
0.102 BTU/lb·°F (0.427 kJ/kg·K) at 32-212°F (0-100°C)
Thermal Conductivity
15.5 BTU/hr/ft²/ft/°F (26.8 W/m·K) at 212°F (100°C)
Thermal Expansion
6.1 × 10⁻⁶ in/in/°F (11.0 µm/m·K) at 32-212°F (0-100°C)
Modulus of Elasticity
29 × 10³ ksi (200 × 10³ MPa)
Magnetic Permeability
Magnetic
Melting Range
2700-2790°F (1482-1532°C)
Mechanical Properties (Annealed)
Property
Value
Ultimate Tensile Strength
60 KSI min (414 MPa min)
Yield Strength (0.2% offset)
40 KSI min (276 MPa min)
Elongation
22% min
Hardness
Rb 90 max
Available Finishes
#1 - Hot rolled annealed and descaled for applications where decorative finish is not required
#2D - Dull finish for deep drawn parts and applications requiring lubricant retention
#2B - Smooth finish with brighter appearance than 2D
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