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A technology of high hardenability and carburized steel, applied in the field of alloy structural steel, can solve the problem that Mn-Cr series carburized steel cannot be applied to heavy-duty gearboxes and drive axle gears of commercial vehicles, etc. The effect of reducing intergranular oxidation and improving surface corrosion resistance
Inactive Publication Date: 2018-01-19
DONGFENG COMML VEHICLE CO LTD
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Problems solved by technology
[0005] The purpose of the present invention is to overcome the problem that the Mn-Cr series carburizing steel existing in the prior art cannot be applied to commercial vehicle heavy-duty gearbox
Method used
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Embodiment 1
[0030] A high hardenability Mn-Cr series carburizing steel, its composition and mass percentage content are: C 0.18, Si 0.20, Mn 1.40, P 0.035, S 0.028, Cr 1.35, Mo 0.10, Al 0.017, N 0.010, Ni 0.10, Cu 0.11, B0.0001, the rest are Fe and unavoidable impurities.
Embodiment 2
[0032]A high hardenability Mn-Cr series carburizing steel, its composition and mass percentage content are: C 0.20, Si 0.19, Mn 1.38, P 0.013, S 0.021, Cr 1.39, Mo 0.022, Al 0.022, N 0.013, Ni 0.14, Cu 0.10, B0.00025, the rest are Fe and unavoidable impurities.
Embodiment 3
[0034] A high hardenability Mn-Cr series carburizing steel, its composition and mass percentage content are: C 0.21, Si 0.18, Mn 1.33, P 0.012, S 0.019, Cr 1.40, Mo 0.021, Al 0.029, N 0.018, Ni 0.14, Cu 0.13, B0.0003, the rest are Fe and unavoidable impurities.
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Abstract
The invention discloses high-hardenability Mn-Cr series carburizing steel. The high-hardenability Mn-Cr series carburizing steel is composed of the following components of, by mass, 0.18-0.22% of C, less than or equal to 0.20% of Si, 1.20-1.40% of Mn, less than or equal to 0.035% of P, 0.015-0.040% of S, 1.25-1.40% of Cr, less than or equal to 0.10% of Mo, 0.017-0.035% of Al, 0.010-0.020% of N, greater than or equal to 0.10% of Ni, 0.10-0.20% of Cu, less than or equal to 0.0003% of B and the balance Fe and unavoidable impurities. According to the high-hardenability Mn-Cr series carburizing steel, small heat-treatment deformation capability and high reliability are achieved, and the high-hardenability Mn-Cr series carburizing steel is suitable for commercial vehicle heavy load gearboxes anddriving axle gears.
Description
technical field [0001] The invention belongs to the technical field of alloy structural steel, and in particular relates to a high-hardenability Mn-Cr series carburizing steel, which is suitable for heavy-duty gearboxes and drive axle gears of commercial vehicles. Background technique [0002] At present, Mn-Cr series carburizing steel is widely used in gear parts in China. Among them, the requirements of GB / T5216 for Mn-Cr series carburizing steel are: the control range of hardenability is J9=30~43HRC, J15=25~ 39HRC, material alloy elements C0.17%~0.22%, Si≤0.37%, Mn 1.10%~1.40%, Cr 1.00%~1.30%, residual elements P≤0.035%, S≤0.035%, Cu≤0.25%, Ni ≤0.30%, the austenite grain size is not less than grade 5. In the standard CGMA001-1 formulated by the China Gear Professional Association, the hardenability control range of Mn-Cr series carburizing steel J10=32~38HRC, material alloying elements C 0.17%~0.23%, Si≤0.12%, Mn 1.10%~1.50% , Cr 1.00%~1.30%, residual elements P≤0.030%,...
Claims
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