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Unstressed exposure tests of Inconel 740H alloy tube were carried out at 750℃ for 500-3000h. The microstructure evolution and microhardness were studied by means of thermodynamic simulation, OM, FEG-SEM and microhardness testing. The results show that the tube is qualified if both chemical composition and tensile properties of the as-received alloy meet the corresponding requirements of ASME. After long term exposure, the main precipitates are γ' and M23C6, and no η and σ phase. With thedoi:10.11868/j.issn.1001-4381.2016.09.009 doaj:6af8354e87754184a2efd297667c77a1 fatcat:3uqc223zmjd65hq2umylha66dm