Spheroidizing annealing process for high-toughness medium carbon steel wires
A technology of spheroidizing annealing and high toughness, which is applied in the direction of manufacturing tools, furnace types, furnaces, etc. It can solve the problems of long holding time, easy to wear out molds, and high energy consumption, and achieve low molding cracking rate, low equipment requirements, The effect of simple process
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Embodiment 1
[0027] A spheroidizing annealing process for high-toughness medium-carbon steel wire, which comprises the following steps in sequence:
[0028] A. Put the 45# medium carbon steel wire in the heat treatment furnace, fill the heat treatment furnace with industrial nitrogen with a purity of 99.99%, and raise the temperature in the furnace to 500°C at a rate of 90°C / hour, then close the process Nitrogen, fill the heat treatment furnace with methanol cracking gas, continue to heat up to 710°C, and keep it warm for 5h;
[0029] B. Cooling in the first stage: Cool the temperature in the furnace to 700°C at a rate of 10°C / hour through air cooling, and keep it warm for 2 hours;
[0030] C. Second-stage cooling: continue to cool the temperature in the furnace to 630°C at a rate of 10°C / hour by air cooling, close the methanol cracking gas, and fill the heat treatment furnace with industrial nitrogen with a purity of 99.99%;
[0031] D. The third stage of cooling: the medium carbon steel...
Embodiment 2
[0036] A spheroidizing annealing process for high-toughness medium-carbon steel wire, which comprises the following steps in sequence:
[0037] A. Put the 45# medium carbon steel wire in the heat treatment furnace, fill the heat treatment furnace with industrial nitrogen with a purity of 99.99%, and then raise the temperature in the furnace to 500°C at a rate of 110°C / hour, and then close the process Nitrogen, fill the heat treatment furnace with methanol cracking gas, continue to heat up to 720°C, and keep warm for 4h;
[0038] B. The first stage of cooling: Cool the temperature in the furnace to 690°C at a rate of 10°C / hour through air cooling, and keep it warm for 3 hours;
[0039] C. Second-stage cooling: continue to cool the temperature in the furnace to 640°C at a rate of 10°C / hour through air cooling, close the methanol cracking gas, and fill the heat treatment furnace with industrial nitrogen with a purity of 99.99%;
[0040] D. The third stage of cooling: the medium ...
Embodiment 3
[0045] A spheroidizing annealing process for high-toughness medium-carbon steel wire, which comprises the following steps in sequence:
[0046] A. Put the 45# medium carbon steel wire in the heat treatment furnace, fill the heat treatment furnace with industrial nitrogen with a purity of 99.99%, raise the temperature in the furnace to 500°C at a rate of 120°C / hour, and turn off the process nitrogen , fill the heat treatment furnace with methanol cracking gas, continue to heat up to 730°C, and keep it warm for 3h;
[0047] B. The first stage of cooling: Cool the temperature in the furnace to 680°C at a rate of 10°C / hour through air cooling, and keep it warm for 4 hours;
[0048] C. Second-stage cooling: continue to cool the temperature in the furnace to 650°C at a rate of 10°C / hour by air cooling, close the methanol cracking gas, and fill the heat treatment furnace with industrial nitrogen with a purity of 99.99%;
[0049] D. The third stage of cooling: the medium carbon steel...
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