How does it look after 4 years at about 1200 oC
>The pictures taken with the SMZ-171, the Motic EPI-Illuminator and the Moticam 10+, are showing a Haynes alloy component which has been exposed to a temperature of about 1200 oC during a period of 4 years. The component was positioned in a naphtha cracking oven (methane fuel side) of a chemical ethylene plant. On the surface of the component that is affected greatly, carburization and crystal formation can be seen. By means of ultrasonic thickness measurement it can be checked if sufficient unaffected material is left under the carburized layer, in order to see if the component is still strong enough.
Haynes 230 alloy is a nickel-chromium-tungsten-molybdenum alloy that combines excellent high-temperature strength, outstanding resistance to oxidizing environments up to 2100°F (1149°C) for prolonged exposures, premier resistance to nitriding environments, and excellent long-term thermal stability. It is readily fabricated and formed, and is castable. Other attractive features include lower thermal expansion characteristics than most high-temperature alloys, and a pronounced resistance to grain coarsening with prolonged exposure to high temperatures.
Rod material out of Haynes alloy Exposed Haynes alloy piping distance piece
Haynes alloy 230 is composed of Ni 57%, Cr 22%, Tu 14% and Fe < 3%
With thanks to: Gerard Janssen and Rijk Koster, mechanical engineers