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| Mailing Address |
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UKF Stainless Ltd
12 Buntsford Park Road
Bromsgrove
Worcestershire
B60 3DX
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| Telephone / Fax |
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01527 578686 |
| Fax: |
01527 837792 |
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| Email |
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 info@ukfstainless.co.uk |
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Corrosion and Oxidation Resistance
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Introduction:
Stainless steels are widely used for their oxidation resistance
at elevated temperatures. In air, a protective scale is formed
which is generally quite stable up to about 800-850°C
unless substantial cycling of temperature occurs. Some steels
resist scaling at even higher temperatures.
Maximum Service Temperature
in Air or Hydrogen:
(Euronorm 95-79. For guidance only)
Special
Considerations for High Temperature Service:
Water vapour and sulphur dioxide, if present, can accelerate
oxidation rates of stainless steels. Hydrogen sulphide and
sulphur vapours are more aggressive to stainless steels than
oxygen and substantially reduce the maximum allowable temperature
in air.
Thermal Cycling Oxidation
Resistance:
Weight change: grams per square metre of surface for temperatures
as shown:
|
UNS |
705°C |
815°C |
980°C |
1090°C |
| S40900 |
0.10 |
0.80 |
1430* |
-10,000* |
| S43000 |
0.40 |
1.30 |
-1640* |
-10,000* |
| S30400 |
0.20 |
1.70 |
-3400 |
-10,000* |
| S30900 |
0.20 |
2.70 |
-120 |
-910 |
| N08800 |
0.30 |
3.20 |
9 |
-560 |
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These were cyclic tests for 100 hours duration in air containing
10% water vapour. Cycled every 2 hours to room temperature
then back to test temperature. Weight gain or loss (-), measured
without purposeful removal of scale.
Some of the higher temperature tests, indicated by *, were
for a much shorter time than the 100 hours. |
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Page Last Modified: 10/04/06 13:16
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