High-strength and high-toughness alloy tool steel wire rod and manufacturing method thereof
A manufacturing method and technology for tough alloys, applied in manufacturing tools, furnaces, heat treatment equipment, etc., can solve the problems of poor hardenability, shorten the manufacturing cycle, reduce manufacturing costs, etc., achieve excellent torsional fracture resistance, and improve the effect of technical level
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Embodiment 1-8
[0053] The high-strength and tough alloy tool steel wire rods of Examples 1-8 of the present invention are all prepared by the following steps:
[0054] (1) According to the chemical composition shown in Table 1, smelt, cast, and roll into wire rod: the wire rod specification is φ8 ~ 12mm, and slow cooling measures are taken when the rolled wire rod passes through the Stelmo air-cooled line. When the Telmore air-cooled wire is used, turn off all fans and cover the insulation cover to reduce the cooling rate of the wire rod.
[0055] (2) Off-line spheroidizing annealing: the wire rod is first heated to 775-840°C with the furnace, and the first holding time is controlled to be 4-6h, and then cooled to the first time at a speed of 10-50°C / h. The final cooling temperature is 710-750°C, the second heat preservation is 4-7h, and then cooled to the second final cooling temperature of ≤600°C at a second speed of 10-50°C / h.
[0056] (3) Quenching and tempering heat treatment is carrie...
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