Kanthal® Super RA

Kanthal^® Super RA Heating Elements are specially designed to work in nitrogen at temperatures above 1250°C (2280°F). Other Kanthal^® Super elements have an excellent lifetime in oxidizing atmospheres but when operating in nitrogen, nitration occurs. At temperatures above 1250°C (2280°F), the protective glaze is consumed and the silicon in the silicide of the elements may react with nitrogen forming silicon nitride, which can cause scaling. The speed of the process depends on the dew point and the time in the atmosphere. The solution to these problems has been to run the elements in the air at high temperature for a couple of hours to restore the glaze.

Kanthal^® Super RA withstands nitration at high temperatures better than any other type of Kanthal Super element. The nitration process still occurs, but to a 50% lower rate than for Kanthal^® Super 1800. The temperature, at which the weight reduction starts, is about 75°C (167°F) higher. The element has also substantially longer lifetime on all reducing and oxygen deficient atmospheres and possesses a higher tolerance to other aggressive environments.

Special features

• Longer life at high temperatures in reactive atmospheres
• Long life in all reducing and oxygen deficient atmospheres
• Can be used in nitrogen up to 1700°C (3090°F) at a 40°C (104°F) dew point
• Standard and specially designed elements

Typical applications for Kanthal^® Super RA are withn different types of sintering, forging- and heat treatment furnaces.