... such as gears, shafts, piston pin and the uneven force big machining parts, forgings, stampings and bolts, nuts, pipe joint. 2. ... state, high mechanical performance requirements, the use of quenched and tempered.(5) Moderate in cold plastic deformation, the ... machinability by annealing and normalizing is better than quenched and tempered. 5. Chemical analysis CSiMnP≤S ...