Short- and long-term tests of heat-resistance were carried out on Cr20, Cr18Ni9, Cr24 and Cr24Ni20 steels. The long-term tests revealed increased oxidation connected with depletion of alloying elements near the metal surface. This may affect estimates of the life of components made from these steels based on short-term tests. Cyclic heating and cooling had a favourable effect on the oxidation rate with Cr24 steel and an adverse effect with Cr24Ni20 steel.
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References
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