Three-step annealing process for aluminum-free ultra-high carbon steel
A technology of ultra-high carbon steel and annealing process, applied in manufacturing tools, heat treatment equipment, heat treatment process control, etc., to achieve the effect of easy operation and low energy consumption
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Embodiment 1
[0022] A three-step annealing process for aluminum-free ultra-high carbon steel, the composition and content expression of the ultra-high carbon steel is Fe-1.58C-1.97Cr-0.26Si-0.73Mn-0.09Mo, the three-step annealing The steps of the process are as follows:
[0023] 1) Austenitizing treatment: heat the material to 840°C at a heating rate of 5°C / min and hold for 2 hours;
[0024] 2) Cooling treatment after austenitization: cooling the austenitized isothermal ultra-high carbon steel from 840°C to 750°C at a cooling rate of 3°C / s;
[0025] 3) Isothermal treatment: The ultra-high carbon steel is isothermally treated at 750°C for 50 minutes, so that the ultra-high carbon steel isothermally obtained a structure composed of pearlite and fine and uniformly distributed granular carbides; after isothermal treatment, the furnace Cool to room temperature.
[0026]
[0027] figure 1 It is the metallographic photograph of the sample obtained in Example 1 of the present invention, and a...
Embodiment 2
[0030] A three-step annealing process for aluminum-free ultra-high carbon steel, the composition and content expression of the ultra-high carbon steel is Fe-1.58C-1.97Cr-0.26Si-0.73Mn-0.09Mo, the three-step annealing The steps of the process are as follows:
[0031] 1) Austenitizing treatment: heat the material at a heating rate of 8°C / min to 860°C for 2.5 hours;
[0032] 2) Cooling treatment after austenitization: cooling the austenitized isothermal ultra-high carbon steel from 860°C to 770°C at a cooling rate of 5°C / s;
[0033] 3) Isothermal treatment: The ultra-high carbon steel is isothermally treated at 770°C for 65 minutes, so that the ultra-high carbon steel isothermally obtained a structure composed of pearlite and fine and uniformly distributed granular carbides; after isothermal treatment, the furnace Cool to room temperature.
[0034]
[0035] figure 2 It is the metallographic photograph of the sample obtained in Example 2 of the present invention, and a struct...
Embodiment 3
[0038] A three-step annealing process for aluminum-free ultra-high carbon steel, the composition and content expression of the ultra-high carbon steel is Fe-1.58C-1.97Cr-0.26Si-0.73Mn-0.09Mo, the three-step annealing The steps of the process are as follows:
[0039] 1) Austenitizing treatment: heat the material to 880°C at a heating rate of 10°C / min and hold for 3 hours;
[0040] 2) Cooling treatment after austenitization: cooling the austenitized isothermal ultra-high carbon steel from 880°C to 790°C at a cooling rate of 8°C / s;
[0041] 3) Isothermal treatment: Ultra-high carbon steel is isothermally treated at 790°C for 80 minutes, so that ultra-high carbon steel isothermally obtained a structure composed of pearlite and fine and uniformly distributed granular carbides; after isothermal treatment, the furnace Cool to room temperature.
[0042]
[0043] image 3 It is the metallographic photograph of the sample obtained in Example 3 of the present invention, and a structu...
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