Spheroidizing annealing process of superplastic medium carbon steel wire
An annealing process, spheroidizing annealing technology, applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., to achieve the effect of low cracking rate, low product forming cracking rate, and low forming cracking rate
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Embodiment 1
[0028] A kind of spheroidizing annealing process of superplastic medium carbon steel wire, it comprises the following steps successively:
[0029] A. Put the steel wire made of SWRCH35K 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 90°C / hour, and turn off the process nitrogen. Fill the heat treatment furnace with methanol cracking gas, continue to heat up to 720°C, and keep it warm for 5 hours;
[0030] 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 3 hours;
[0031] C. Second-stage cooling: continue to cool the temperature in the furnace to 610°C at a rate of 20°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%;
[0032] D. The third stage of cooling: the steel wire is ...
Embodiment 2
[0037] A kind of spheroidizing annealing process of superplastic medium carbon steel wire, it comprises the following steps successively:
[0038] A. Put the steel wire made of SWRCH35K 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, then 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 4 hours;
[0039] B. Cooling in the first stage: Cool the temperature in the furnace to 670°C at a rate of 10°C / hour by air cooling, and keep it warm for 4 hours;
[0040] C. Second-stage cooling: continue to cool the temperature in the furnace to 620°C at a rate of 20°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%;
[0041] D. The third stage of cooling: the steel wi...
Embodiment 3
[0046] A kind of spheroidizing annealing process of superplastic medium carbon steel wire, it comprises the following steps successively:
[0047] A. Put the steel wire made of SWRCH35K 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, turn off the process nitrogen, and Fill the heat treatment furnace with methanol cracking gas, continue to heat up to 740°C, and keep it warm for 3 hours;
[0048] B. The first stage of cooling: Cool the temperature in the furnace to 660°C at a rate of 10°C / hour through air cooling, and keep it warm for 5 hours;
[0049] C. Second-stage cooling: continue to cool the temperature in the furnace to 630°C at a rate of 20°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%;
[0050] D. The third stage of cooling: the steel wire ...
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