Heat treatment process: quenching temperature is 820 degrees, and the holding time is determined according to the furnace loading method, and is subject to the complete heat penetration of the workpiece. After being released, it is oil-cooled (water-soluble quenching medium can now be used instead of oil quenching), and the quenching hardness is 54-59HRC.

The tempering temperature is 460 degrees, the tempering time is 60-70 minutes, and it is cooled with warm water after coming out of the furnace. Since the material has the second type of tempering brittleness, it should be cooled quickly during tempering in order to reduce oxidation. layer thickness and eliminates type II temper brittleness. ?

0.8 mm thick material, hardness between HRC42-48.

Extended information:

65 manganese steel is a carbon spring steel with high strength, great hardenability, and low decarburization tendency; however, it is sensitive to overheating and is prone to Quenching cracks and temper brittleness.

65 manganese steel is used for various small-sized flat and round springs, seat springs, and spring springs. It can also be used to make spring rings, valve springs, clutch reeds, brake springs, and cold-drawn steel wires. coil spring.

Due to the work hardening phenomenon of high manganese steel, processing of castings should be avoided as much as possible. The holes and slots in the casting should be cast as much as possible. But processing high manganese steel is not completely impossible. Tool dressing can be carried out after one feed. Unavoidable processing should be enlarged during the casting process design so that the processing feed can avoid the work-hardened layer.

When high manganese steel is reheated, there is a brittle temperature range of carbide precipitation between 250 and 800 °C, and as-cast high manganese steel also has network carbides and casting stress. Therefore, the welding performance Very poor.

Reference: Baidu Encyclopedia - Manganese Steel

Reference: Baidu Encyclopedia - Heat Treatment