Application of Constant Extension Rate Technique in a Sulfidizing Gas at High Temperatures

摘要

The constant extension rate (CER) technique was applied in experiments done in a sulfidizing gas in the temperature range of 573-873 K. The test method was developed to study material problems in coal gasification and fluidized bed plants. Most of the experiments were performed on AISI 304 stainless steel. Some exploratory experiments were performed on the high alloy steels AISI 310, X2CrNiMo20.18.6, X2CrNiMoN22.6.5, X2CrNiMo20.8.2 and X2NiCr30.20. Surface cracks that developed during the CER test are favored spots for sulfidation and oxidation. Blunting of crack tips occurs at higher temperatures and low extension rates. CER experiments seem to be a promising technique to select materials for coal-gasification plants in the future.