Method for increasing quenching degree and heat processing performance of gear steel
A technology of hardenability and thermal processing, which is applied in the field of improving the hardenability and thermal processing performance of gear steel, and can solve the problems of high hardenability of gear steel, low cost and high cost of gear steel
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Embodiment 1
[0015] Embodiment 1 is a method for improving the hardenability and hot workability of 40MnBH gear steel. The user requires that the end quenching performance is narrower and stricter than the relevant standard, and the requirement is the upper limit of the standard. The steps are as follows:
[0016] 1 electric furnace smelting
[0017] Electric furnace smelting is to complete the melting and oxidation of scrap steel. Add 30 tons of scrap steel to a 50-ton high-power electric furnace. The P content in the scrap steel is generally 0.020-0.035%, which is 0.026% in this embodiment; Added to the same high-power electric furnace, the P content in the molten iron is generally 0.040-0.070%, which is 0.055% in this embodiment, and the Si content is generally 0.5-0.8%, which is 0.6% in this embodiment; start oxygen blowing after adding molten iron, The whole process of oxygen-blowing scrap steel melting and molten steel oxidation is carried out at the same time. During the smelting pr...
Embodiment 2
[0020] Embodiment two is the method for improving the hardenability and hot workability of 20CrMnTiH gear steel. This steel type is used to manufacture gears and main shafts of automobiles and heavy lathes, requiring good hardenability and surface quality. The steps are as follows:
[0021] 1 electric furnace smelting
[0022] Add 33 tons of scrap steel into a 50-ton high-power electric furnace. The P content in the scrap steel is generally 0.020-0.035%, which is 0.030% in this embodiment; The P content is 0.040-0.070%, which is 0.060% in this embodiment, and the Si content is generally 0.5-0.8%, which is 0.6% in this embodiment; oxygen blowing is started after adding molten iron, and the whole process of oxygen blowing is used to melt scrap steel and oxidize molten steel at the same time During the smelting process, solid furnace materials such as scrap steel and lime are rapidly melted, and C, P, gas, and inclusions are removed at the same time. Generally, the temperature of...
Embodiment 3
[0025] Embodiment three is the method for improving the hardenability and hot workability of ZL20CrMoH gear steel. This steel type is used for rear axle gears and transmission gears of 8-ton trucks. Austenite grain size requirements are very strict, the steps are as follows:
[0026] 1 electric furnace smelting
[0027]Add 30 tons of scrap steel into a 50-ton high-power electric furnace. The P content in the scrap steel is generally 0.020-0.035%, which is 0.025% in this embodiment; The P content is generally 0.040-0.070%, and this embodiment is 0.050%, and the Si content is generally 0.5-0.8%, and this embodiment is 0.6%. During the smelting process, scrap steel and lime solids are rapidly melted, and C, P, gas, and inclusions are removed at the same time. Generally, the temperature of molten steel reaches 1640-1680°C, C≥0.09%, and P≤0.017%. Present embodiment is at 1660 DEG C, C=0.12%, when P=0.016%, the molten steel is poured into ferrochromium, ferromanganese, ferromolybd...
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