The S31603 stainless steel was precharged with hydrogen by hot hydrogen charging method,and then it was subjected to slow strain rate tensile tests at different temperatures in air environment.By comparing the tensile properties and microstructure of S31603,the effect of internal hydrogen on the tensile properties of S31603 was studied.The results show that the strength,elongation and section shrinkage of S31603 do not change significantly before and after hot hydrogen charging at the same temperature,and the plasticity and strength of S31603 is not significantly affected by hot hydrogen charging.The tensile fracture morphology of samples in different states is dimple-like fracture,and the fracture properties of S31603 are not changed by hot hydrogen charging and temperature change.The yield strength,tensile strength and elongation of samples decrease with the increase of temperature,but the area shrinkage remains stable.In addition,it is found that there is preferential fracture phenomenon in the position of high-temperature ferrite.
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