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01151 THE INFLUENCE OF Si, W AND WATER VAPOR ON THE OXIDATION BEHAVIOR OF 9Cr STEELS

Picture for 01151 THE INFLUENCE OF Si, W AND WATER
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Product Number: 51300-01151-SG
ISBN: 01151 2001 CP
Author: F. Dettenwanger, M. Schorr, J. Ellrich, T. Weber, M. Schtitze
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In order for Cr-steels to have oxidation resistance, the Cr content in the alloy must be above a critical limit. Since the recently developed 9% Cr steels are close to that limit their oxidation behavior is of critical importance concerning service lifetime and reliability of structural components. In the present paper the influence of water vapor and the alloying elements Si and W on the oxidation behavior of 9% Cr steels was investigated. Four different alloys of the ferritic-martensitic 9% Cr steel type were discontinously oxidized at 650 °C in dry air and air containing 4 and 10% water vapor for up to 3500 h. The results indicate that water vapor significantly accelerates oxidation of these steels and that the Si- content of the alloys is critical for the oxidation performance, especially under wet conditions.
In order for Cr-steels to have oxidation resistance, the Cr content in the alloy must be above a critical limit. Since the recently developed 9% Cr steels are close to that limit their oxidation behavior is of critical importance concerning service lifetime and reliability of structural components. In the present paper the influence of water vapor and the alloying elements Si and W on the oxidation behavior of 9% Cr steels was investigated. Four different alloys of the ferritic-martensitic 9% Cr steel type were discontinously oxidized at 650 °C in dry air and air containing 4 and 10% water vapor for up to 3500 h. The results indicate that water vapor significantly accelerates oxidation of these steels and that the Si- content of the alloys is critical for the oxidation performance, especially under wet conditions.
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