Description
Type 439 is an 18% chromium, titanium stabilized ferritic stainless steel with corrosion resistance similar to that of 304/304L stainless steel. This grade may be used in the annealed, cold formed or as-welded condition in applications where other stainless steels are used. Type 439 has good weldability due to titanium stabilization and has excellent resistance to stress corrosion cracking.
Chemical Composition (wt%)
Element | 439 |
Carbon | 0.030 |
Chromium | 17.0-19.0 |
Nickel | 0.50 |
Manganese | 1.00 |
Silicon | 1.00 |
Nitrogen | 0.030 |
Phosphorus | 0.040 |
Sulfur | 0.030 |
Aluminum | 0.15 |
Titanium | 0.20 +4(C+N) min |
* Maximum, unless range is indicated
Mechanical Properties
Property | 439 |
Yield Strength, min. (ksi) | 30 |
Tensile Strength, min. (ksi) | 60 |
Elongation, min. (%) | 22 |
Hardness, max. (Rb) | 89 |
Physical properties for Type 439 stainless steel
Property | 439 |
Density, lb/in3 | 0.278 |
Modulus of Elasticity, psi | 29.0 x 106 |
Coefficient of Thermal Expansion, 68-212˚F, /˚F | 5.6 x 10-6 |
Thermal Conductivity, Btu/ft hr ˚F | 14.0 |
Specific Heat, Btu/lb ˚F | 0.11 |
Electrical Resistivity, Microohm-in | 24.8 |
