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Alloy 188 is non-magnetic. It has good high temperature strength up to 1800ºF (982°C) and good oxidation resistance up to 2100ºF (1149°C). This alloy performs well in continuous high temperature service and has excellent oxidation, spalling and corrosion resistance, achieved through the addition of chromium in combination with a minute amount of lanthanum. The lanthanum addition produces a tenacious, protective oxide scale at high temperatures. This alloy also maintains its ductility at cryogenic temperatures but strength levels are increased substantially.
The composition of Inconel 188 breaks down as follows:
| Element | Minimum | Maximum |
| Carbon | 0.05 | 0.15 |
| Manganese | -- | 0.15 |
| Silicon | 0.20 | 0.50 |
| Silicon | 0.20 | 0.50 |
| Phosphorous | -- | 0.020 |
| Sulfur | -- | 0.015 |
| Chromium | 20.00 | 24.00 |
| Nickel | 20.00 | 24.00 |
| Tungsten | 13.00 | 16.00 |
| Lathanum | 0.02 | 0.12 |
| Boron | -- | 0.015 |
| Iron | -- | 3.00 |
| Cobalt | remainder |
Specifications
Haynes 188 is covered by the following specifications:
UNS R30188
Rod, Bar, Wire and Forging Stock: AMS 5772
Plate, Sheet and Strip: AMS 5608
Welding Wire: AMS 5801
Trademark Notice: Some names are trade names and/or trademarks of specific manufacturers. American Special Metals, Corp. is not affiliated with any manufacturer(s). Orders will be filled to meet specifications from any available source(s). Names are listed solely for reference to help identify products consistent with listed specifications.
Haynes 188 Alloy is a Registered Trademark of Haynes International and Its subsidiaries.
UNS R30188
Rod, Bar, Wire and Forging Stock: AMS 5772
Plate, Sheet and Strip: AMS 5608
Welding Wire: AMS 5801
Trademark Notice: Some names are trade names and/or trademarks of specific manufacturers. American Special Metals, Corp. is not affiliated with any manufacturer(s). Orders will be filled to meet specifications from any available source(s). Names are listed solely for reference to help identify products consistent with listed specifications.
Haynes 188 Alloy is a Registered Trademark of Haynes International and Its subsidiaries.