A preparation method of ultra-high strength medium carbon nano-bainitic steel
A bainitic steel and ultra-high-strength technology is applied in the field of preparation of ultra-high-strength medium-carbon nano-bainite steel, which can solve the problems of complex production process and long preparation time of high-strength nano-bainite steel, and achieves The effect of improving plasticity and toughness, broad application prospects and great development potential
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Embodiment example 1
[0041] The implementation of the present invention provides a method for preparing ultra-high-strength medium-carbon nano-bainitic steel, using C 0.25-0.30%; Si 1.2-1.5%; Mn 1.0-1.7%; Cr 1.2-1.5%; Al 1.5- 2.0%; Mo 0.8-1.0%; Ni 0.6-1.0%; Nb 0.015-0.020% medium carbon bainite steel was used as raw material for testing.
[0042] The specific process includes:
[0043] (1) After heating 25kg of forging billet to 1200°C for 24h and homogenizing for 24 hours, forging to a billet of 60mm×45mm×15mm and cooling to room temperature;
[0044] (2) Reheat the billet to 1000°C for 0.5h, then put it into a salt bath furnace for bainite transformation, set the temperature of the salt bath furnace at 338°C, keep it for 1h, and then air cool to room temperature;
[0045](3) 6 hours after the sample was cooled to room temperature, rolling deformation was carried out. The single pass reduction is 5%, 5% and 5% in turn.
[0046] (4) Reheat the rolled sample to 300°C at a heating rate of 3°C / min...
Embodiment example 2
[0049] The implementation of the present invention provides a method for preparing ultra-high-strength medium-carbon nano-bainitic steel, using C 0.25-0.30%; Si 1.2-1.5%; Mn 1.0-1.7%; Cr 1.2-1.5%; Al 1.5- 2.0%; Mo 0.8-1.0%; Ni 0.6-1.0%; Nb 0.015-0.020% medium carbon bainite steel was used as raw material for testing.
[0050] The specific process includes:
[0051] (1) After heating 25kg of forging billet to 1200°C for 24h and homogenizing for 24 hours, forging to a billet of 60mm×45mm×15mm and cooling to room temperature;
[0052] (2) Reheat the billet to 1000°C for 0.5h, then put it into a salt bath furnace for bainite transformation, set the temperature of the salt bath furnace to 340°C, keep it for 1h, and then air cool to room temperature;
[0053] (3) After cooling the sample to room temperature for 8 hours, carry out rolling deformation at room temperature. Single pass reduction is 6%, 6% and 4%.
[0054] (4) Reheat the rolled sample to 300°C at a heating rate of 5°C...
Embodiment example 3
[0057] The implementation of the present invention provides a method for preparing ultra-high-strength medium-carbon nano-bainitic steel, using C 0.25-0.30%; Si 1.2-1.5%; Mn 1.0-1.7%; Cr 1.2-1.5%; Al 1.5- 2.0%; Mo 0.8-1.0%; Ni 0.6-1.0%; Nb 0.015-0.020% medium carbon bainite steel was used as raw material for testing.
[0058] The specific process includes:
[0059] (1) After heating 25kg of forging billet to 1200°C for 24h and homogenizing for 24 hours, forging to a billet of 60mm×45mm×15mm and cooling to room temperature;
[0060] (2) Reheat the blank to 1000°C and keep it warm for 0.5h, then put it into a salt bath furnace for bainite transformation, set the temperature of the salt bath furnace at 342°C, keep it warm for 1h, and then air cool to room temperature;
[0061] (3) After cooling the sample to room temperature for 10 hours, carry out rolling deformation. The single pass reduction is 6%, 5% and 5% in turn.
[0062] (4) Reheat the rolled sample to 400°C at a heati...
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