Abstract: Straight tube used for heat exchanger in nuclear power plant was manufactured by hot extrusion and multi-pass cold rolling process, and different examination tests were performed in accordance with RCC-M M3303 including chemical composition, mechanical properties, properties, corrosion resistance, grain size and non-destructive examination. The test results show that the quality of straight tube manufactured by the process was accordance with purchase requirement of straight tube used for heat exchanger in nuclear power plant.