Production method of a heat-treated steel member
AssigneeTopy Kogyo Kabushiki Kaisha
InventorsHiroyuki Takeno, Masahiro Nakajima, Kiyokazu Niwa, Go Morishima, Daigo Sugiyama
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Abstract
A production method of a heat-treated steel member includes the steps of: shaping a steel material of low-carbon boron steel containing about 0.05-0.30% carbon by weight into a predetermined configuration to bc a shaped material; and heat-treating the shaped material, said heat-treating, includes quench-hardening only.
Claims5
A method of producing a heat-treated steel member selected from any one of a shoe, a bushing, a link, and a pin used for an endless track mounted to a construction vehicle, and a cutting edge of a blade used for a construction vehicle and a vehicle with a snow plow, said method comprising:
- providing a steel member of low-carbon boron steel containing about 0.20-0.30% carbon by weight;
- shaping said steel material to form a shaped material;
- and
- quench-hardening said shaped material to form a low-carbon martensite microstructure close to a surface of said shaped material with a hardness of HRC 45 to 49, a tensile strength of 144 to 155 Kg/mm2, and a toughness of 7 to 10 Kg·m/cm2 Charpy impact value;
- said quench-hardening including heating an entire thickness of said shaped material to above an Ac3 transformation temperature and then rapidly cooling said heated shaped material to below about 200° C. without tempering said shaped material subsequent to said quench-hardening.
Dependencies are inferred from the claim text.