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UNS S40900 Type 409 has the lowest chromium content of the 400 series stainless steels. It cannot be heat-treated and because of its lower chromium content, Type 409 has lower corrosion resistance than other 400 series alloys and is not suitable for high quality appearance applications. Typical applications include automobile mufflers, casket liners, trailer bodies and swimming pool fixtures.
Automotive exhaust systems applications such as manifolds exhaust pipes, catalytic converters, mufflers, tail pipes and other components. Non-automotive exhaust applications such as home heating systems, automotive thermostats and fuel filters, electrical transformer cases, caskets and heat exchanger tubing.
| Element | UNS S40910 | UNS S40920 | UNS S40930 |
|---|---|---|---|
| Carbon | 0.030 max. | 0.030 max. | 0.030 max |
| Manganese | 1.00 max. | 1.00 max. | 1.00 max. |
| Sulfur | 0.020 max. | 0.020 max | 0.020 max |
| Phosphorus | 0.040 max. | 0.040 max. | 0.040 max. |
| Silicon | 1.00 max. | 1.00 max. | 1.00 max. |
| Chromium | 10.5 – 11.7 | 10.5 – 11.7 | 10.5 – 11.7 |
| Nickel | 0.50 max. | 0.50 max. | 0.50 max. |
| Nitrogen | 0.030 max. | 0.030 max. | 0.030 max. |
| Titanium | 6x(C+N) min. – 0.50 max. | 8X(C+N)min. / 0.15 – 0.50 | 0.05 min. |
| Niobium | 0.17 max. | 0.10 max. | |
| Ti + Nb | [0.08+8x(C+N)] min. – 0.75 max. |
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