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The lubrication behavior of glass A5 and glass 35#, which are both usually used in adjustment of nickel-based superalloy pipe line, is investigated during high temperature deformation process of alloy Incoloy 800H by using ring compression test. The results indicate that friction coefficient and flow of melted glass are both related to lubrication behavior of glass lubricant. By using A5 glass lubricant friction coefficient decreases following increasing strain rate and temperature when specimens are lubricated well. However, when strain rate is lower than 0.01s"1, friction coefficient increases following increasing temperature. The reason is that the ring doesn't get enough lubrication because of losing of lubricant during too low speed compression process. By using glass 35# the ring doesn't get enough lubrication during temperature 1050°C-1150°C, stain rate 0.01s-1 -1s-1 because of high fluidity of glass lubricant, but lower friction coefficient about 0.06 is still got when stain rate is 1s-1. Therefore when strain rate is lower than 1s-1 and deformation process is slow, A5 glass performs better because of sufficient lubrication. However 35# glass will have better performance during hot extrusion with high strain rate. Experiment results have been adopted to evaluate character of glass lubricant during extrusion process.