444 Stainless Steel
UNS S44400
Description
444 stainless steel is low carbon and low nitrogen ferritic stainless steel that contains 18% chromium and 2% molybdenum. The stainless steel offers excellent corrosion resistance combined with good formability and weldability characteristics. And it provides pitting and crevice corrosion resistance superior to most ferritic stainless steels. The alloy's enhanced resistance to pitting and crevice corrosion combined with its good general corrosion resistance to a multitude of environments makes it an excellent choice for a wide range of applications such as heat exchanger tubing, food processing equipment, hot water tanks, and automotive exhaust. In addition, its low carbon content also makes it an excellent choice for food preparation as it does not leach harmful chemicals into foods when heated at high temperatures like some other alloys may do.
Chemical Component
| Cr | Ni | Si | C | Mn | Mo | S | P | Nb + Ti | Fe |
|---|---|---|---|---|---|---|---|---|---|
| 17.50-19.50% | 01.00% max | 0.60% | 0.025% max | 1.00% max | 1.75-2.50% | 0.030% max | 0.040% max | 0.20 + 4 x (Carbon+ Nitrogen) min-0.80% max | Balance |
Basic Information
| Items | 444 Stainless Steel |
|---|---|
| Catalog | ACMA-Fe-A026 |
| Electrical Resistivity, microhm-in (microhm-cm) | 68 °F (20 °C): 22.50 (57) |
| Specific Heat, BTU/lbl °F (kJ/kg·K) | 32-212 °F (0-100 °C): 0.102 (0.427) |
| Thermal Conductivity, BTU/hr/ft2/ft/° F (W/m·K) | At 212 °F (100 °C): 15.5 (26.8) |
| Mean Coefficient of Thermal Expansion, in/in/°F (µm/m·K) | 32-212 °F (0-100 °C): 6.1 x 10-6 (11.0) |
| Modulus of Elasticity, ksi (MPa) | 29 x 103 (200 x 103) in tension |
| Magnetic Permeability | Magnetic |
| Melting Range | 2700-2790 ° F (1482-1532 °C) |
Material Forms
Alfa Chemistry offers 444 stainless steel in a variety of forms, including Coil, Strip, Foil, Ribbon, Wire.
Mechanical Properties
- Mechanical properties at room temperature: annealed
| Ultimate Tensile Strength | Yield Strength (0.2% Offset) | Elongation | Hardness |
|---|---|---|---|
| 60 KSI min (414 MPa min) | 40 KSI min (276 MPa min) | 22% min | Rb 89 max |
Additional Properties
Corrosion Resistance: Refer to NACE (National Association of Corrosion Engineers) for recommendations.
Cold Forming: Type 444 provides excellent formability and can be readily deep drawn and spin formed. Stretch forming, however, is limited in application for this alloy.
Heat Treatment: 444 stainless steel is non-heat treatable.
Welding: For best results refer to: SSINA's "Welding of Stainless Steels and Other Joining Methods".
Specifications
Coil, Strip, Foil, Ribbon, Wire: ASTM A268, ASTM A240, ASTM A-276, ASTM A-479, ASTM A-580
Applications
- Food processing
- Brewery and wine making equipment
- Hot-water tanks
- Heat-exchanger tubing
- Automotive components
* Technical data included herein should be used as a guideline only, and should not be construed as maximum or minimum values for specification or for final design, or for a particular use or application. The data may be revised anytime without notice.
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