STAINLESS STEEL - 309 Stainless Steel
Specifications
The following specifications cover Stainless Steel 309
- AISI 309
- ASTM A167
- ASTM A249
- ASTM A276
- ASTM A473 (Forging - Open Die)
- ASTM A479
- DIN 1.4828
- UNS S30900
Chemistry Data
| Carbon | 0.2 max |
| Chromium | 22 - 24 |
| Iron | Balance |
| Manganese | 2 max |
| Nickel | 12 - 15 |
| Phosphorus | 0.045 max |
| Silicon | 1 max |
| Sulphur | 0.03 max |
Principal Design Features
This alloy is known for good strength and oxidation resistance in continuous service temperatures up to 2000 F (1093 C).It is superior to 304 stainless in both strength and corrosion resistance.
Applications
Oven linings, boiler baffles, fire box sheets, furnace components and other high temperature containers.
Machinability
This alloy machines similarly to type 304 stainless. Its chips are stringy and it will work harden rapidly. It is necessary to keep the tool cutting at all times and use chip breakers.
Welding
Most of the austenitic stainless steels can be readily welded using fusion or resistance methods. Oxyacetylene welding is not recommended. Filler metal should be AWS E/ER 309 or 309L.
Hot Working
- Working temperatures are 2150 F (1177 C), with reheating necessary at 1800 F (982 C).Rapid quenching is recommended. Full post-work annealing is required to reattain maximum corrosion resistance.
Cold Working
- Although this alloy has a high work hardening rate, it can be drawn, headed, upset, and stamped. Full annealing is required after cold work to remove internal stress.
Annealing
- 1900-2050 F (1038-1121 C), water quench.
Hardening
- This alloy does not respond to heat treatment. Cold work will cause an increase in both hardness and strength.
Physical Data
| Density (lb / cu. in.) | 0.287 |
| Specific Gravity | 7.9 |
| Specific Heat (Btu/lb/Deg F - [32-212 Deg F]) | 0.12 |
| Electrical Resistivity (microhm-cm (at 68 Deg F)) | 468 |
| Melting Point (Deg F) | 2650 |
| Modulus of Elasticity Tension | 29 |