OXIDATION RESISTANCE CR-AL STEELS AND CALCULATION OF PARAMETRIC DIAGRAMS
Keywords:heat resistance, Cr-Al steel, parameter diagram, operating properties, kinetics of oxidation, term of exploitation
In work there are the considered questions of oxidation resistance steels at different temperatures with a different maintenance of chrome and aluminums. Conformity to the law of oxidization of heat-resistant is explored steels in different gases environment. It is set that the heated air is more aggressive environment with the additive 45% of aquatic steam. The increase maintenance of chrome from 18 to 30% results in diminishment of losses of mass from 15 to 5 мг/см2. addition of aluminums to chromic steels also brings to the increase of oxidation resistance studied over steels. Thus, maybe, that became containing of more than a 25% chrome with the addition 2…3% of aluminums has perspective development. For the decline of Saving energy costs and time as mathematical treatment construction of the developed models diagrams was used. The developed method allows to determine different optimum chemical compositions of heat-resistant Cr-Al steels depending on temperature terms and duration of exploitation of the poured details. The developed models allow to determine oxidation resistance and terms of exploitation of Cr-Al steels. The developed models allow with high authenticity to forecast oxidation resistance steels with different concentrations of chrome and aluminums
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