Through experiments

the production process of 16MnCrS5 steel bars for precision turning is determined

and the appropriate sulfur content

cooling speed and annealing temperature parameters are studied to meet the requirements of high-end automotive pin precision turning parts. The results show that the tested 16MnCrS5 steel hot-rolled bars with S content ranging from 0.028% to 0.035% were cooled at a cooling rate of 1.37 to 1.69 ℃/s

and then subjected to stress relief annealing at 620 ℃ for 6 h in a continuous annealing furnace

and the hardness was 180-215 HBW which met customer requirements of that for stress relief annealing precision turning bar.