High-hardenability Mn-Cr series carburizing steel

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%,...

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