A kind of alloy steel and its preparation method and application
A technology of alloy steel and alloy liquid, applied in the field of alloy steel and its preparation
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[0037] The present invention also provides a method for preparing the alloy steel described in the above technical solution, comprising the following steps:
[0038] Pretreatment, quenching and tempering are carried out sequentially on the ingot with the above-mentioned element ratio to obtain alloy steel.
[0039] In the present invention, the preparation process of the ingot preferably includes the following steps:
[0040] Add Ni, Mo and Cr to molten steel to obtain molten steel containing Ni, Mo and Cr;
[0041] When the molten steel containing Ni, Mo and Cr is poured into the ladle and reaches 1 / 3~2 / 3 capacity of the ladle, add Re and boric acid into the ladle;
[0042] The molten steel is an alloy liquid containing C, Si, Mn, P, S, Cu, V, Al and iron in the above ratio.
[0043] The present invention does not have any special limitation on the preparation of the molten steel, and it can be carried out by adopting a process well known to those skilled in the art.
[00...
Embodiment 1
[0051] Composition of alloy steel: by mass percentage, including the following alloying elements: C 0.18%, Si 0.43%, Mn1.00%, P 0.025%, S 0.02%, Cr 0.68%, Ni 0.80%, Mo 0.30%, Cu 0.30%, V 0.03%, Al0.03%, Re 0.20%, B 0.012%, and the balance of iron and unavoidable impurities;
[0052] According to the method for preparing an ingot described in the specific embodiment, an ingot having the above-mentioned proportion is obtained;
[0053] The ingot was raised from room temperature to 860°C at a heating rate of 120°C / min, kept for 4 hours, and cooled to obtain a pretreated ingot;
[0054] Raise the pretreated ingot from room temperature to 700°C at a heating rate of 120°C / min, keep it warm for 2 hours, then raise it to 920°C at a heating rate of 100°C / min, keep it warm for 4 hours, and cool it into room temperature. Raise from room temperature to 720°C at a rate of 100°C / min, hold for 4 hours, and cool in air to obtain alloy steel.
Embodiment 2
[0056] Composition of alloy steel: by mass percentage, including the following alloying elements: C 0.21%, Si 0.50%, Mn0.91%, P 0.025%, S 0.01%, Cr 0.6%, Ni 0.68%, Mo 0.5%, Cu 0.30%, V 0.03%, Al0.08%, Re 0.20%, B 0.012%, and the balance of iron and unavoidable impurities;
[0057] According to the method for preparing an ingot described in the specific embodiment, an ingot having the above-mentioned proportion is obtained;
[0058] The ingot is raised from room temperature to 900°C at a heating rate of 100°C / min, kept for 4 hours, and cooled to obtain a pretreated ingot;
[0059] Raise the pretreated ingot from room temperature to 750°C at a heating rate of 120°C / min, keep it warm for 1.5h, then raise it to 910°C at a heating rate of 80°C / min, keep it warm for 4h, and cool it to room temperature in water , from room temperature to 730°C at a rate of 120°C / min, heat preservation for 4 hours, and air cooling to obtain alloy steel.
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Abstract
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