1020 steel/S20C steel belongs to high-quality low-carbon carbon steel, cold extrusion, carburizing and hardening steel. It has low strength, good toughness, plasticity and weldability. The tensile strength is 253-500MPa, and the elongation is ≥ 24%.
The properties of 1020/S20C steel are basically similar to that of C15 steel, but the strength is slightly higher. It is suitable for manufacturing small and medium-sized carburized carbonitriding and other parts that are not very important in automobile, tractor and general machinery manufacturing, such as hand brake shoe, lever shaft, gearbox speed fork, transmission passive gear, camshaft on tractor, suspension balancer shaft, inner and outer bushing of balancer, etc;
In the hot rolling or normalizing state, it is used to manufacture various mechanical parts with low stress and high toughness; In heavy and medium machinery manufacturing industry, such as forged or pressed pull rod, shackle, lever, sleeve, fixture, etc.
In the steam turbine and boiler manufacturing industry, it is mainly used for pipes, flanges, headers and various fasteners working in non corrosive medium with pressure ≤ 6N/m2 and temperature ≤ 450 ℃; It is used for manufacturing crosshead, piston and other castings on railway and rolling stock.
Normalizing can promote the spheroidization of the steel, refine the massive proeutectoid ferrite, and improve the cutting performance of blanks less than 160HBS.
The process route of the steel die parts is: blanking → forging die blank → annealing → rough machining → cold extrusion molding → recrystallization annealing → mechanical finishing → carburizing → quenching and tempering → grinding and polishing → assembly.