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Chemistry Data :
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| - Carbon |
0.2 max |
- Manganese |
2 max |
- Silicon |
1 max |
| - Chromium |
22 - 24 |
- Nickel |
12 - 15 |
- Sulphur |
0.03 max |
| - Iron |
Balance |
- Phosphorus |
0.045 max |
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Principal Design Features :
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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.
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Applications :
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Oven linings, boiler baffles, fire box sheets,
furnace components and other high temperature containers.
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Corrosion Resistance :
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This alloy is slightly more resistant to corrosion
than 304 stainless. It will resist nitric, nitric-sulfuric,
acetic, lactic and citric acids in mild dilutions. It is recommended
for use in oxidizing but not reducing compounds.
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Machinability :
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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.
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Welding :
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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.
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Hot Working :
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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.
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Cold Working :
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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.
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Annealing :
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1900-2050 F (1038-1121 C), water quench.
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Hardening :
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This alloy does not respond to heat treatment.
Cold work will cause an increase in both hardness and strength.
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