439 stainless steel sheet is a ferritic stainless steel that is titanium stabilized. It shows excellent resistance in fresh water and boiling acids. It is a common choice for automotive exhaust systems, heat exchangers, kitchen equipment, and architectural structures.
CHEMICAL PROPERTIES
| C | MN | P | S | SI | CR | NI | TI |
|---|---|---|---|---|---|---|---|
| 0.03% max | 1.00% max | 0.045% | 0.045% max | 0.75% max | 17 - 19% | 0.50% | 0.50% max |
MECHANICAL PROPERTIES
| MECHANICAL PROPERTIES | ||
|---|---|---|
| Metric | Imperial | |
| Tensile Strength, Ultimate | 482 MPa | 70 ksi |
| Tensile Strength, Yield | 330 MPa | 48 ksi |
| Elongation at Break (in 2") | 32% | 32% |
| Rockwell Hardness | B74 - 78 | B74 - 78 |
439 stainless steel was developed in the 1950s. It was developed for use in direct-fired water heater tanks. This application required good welding properties and stress corrosion cracking resistance. Currently in the United States, lower cost immersion equipment and glass-lined tanks have replaced 439, which continues to be used successfully in Europe for direct fired hot water tanks.
The major advantages of 439 alloy are:
Excellent resistance to Chloride stress corrosion cracking
Good general corrosion resistance particularly in fresh waters and mildly oxidizing environments
Excellent welding properties
High thermal conductivity coefficient
Low thermal expansion coefficient
Reflective color compatibility
Good continuous & cyclic oxidation resistance
Long-term cost advantages.
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