439 Oxidation resistance and corrosion resistance is superior to Type 409 in areas where temperatures may exceed the oxidation limit of Type 409 or where aqueous corrosion resistance, particularly to chlorides, is needed. Applications include: Tubular manifolds and other exhaust system with difficult to form exhaust components.
Nominal Composition
| C: | 0.070 max |
| Mn: | 1.0 max |
| P: | 0.040 max |
| S: | 0.030 max |
| Si: | 1.00 max |
| Cr: | 17.00 – 19.00 |
| Ni: | 0.50 max |
| Ti: | >=0.20+4(C+N) – 1.10 |
| Al: | 0.15 |
| N: | 0.040 |
| Fe: | BAL |
Physical Properties
At 70°F (At 20°C)
Density
0.278 lb./in³ / (7685 kg/m³)
Modulus of Elasticity (E)
28.4 x 10³ ksi / (193 x 10³MPa)
Electrical Resistivity
24.0 μ ohm.in / (60.0 μ ohm.cm)
Applicable Specifications
ASTM A240
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