High-strength hot rolled steel plate roll for automobile wheels as well as preparation method thereof

Abstract

The invention provides a high-strength hot rolled steel plate roll for automobile wheels as well as a preparation method thereof. The method comprises the following steps of: smelting target liquid steel comprising the following components of 0.05-0.10% of C, less than or equal to 0.15% of Si, 1.30-1.50% of Mn, less than or equal to 0.15% of P, less than or equal to 0.002% of S, 0.02-0.10% of Ti, 0.025-0.045% of Nb as well as the balance of Fe and unavoidable impurities; casting into a plate blank continuously: heating the plate blank to 1,180-1,250 DEG C; rolling in a mode of 5 gates, wherein the single-gate rolling rate is not less than 20%; controlling the start rolling temperature of precision rolling to be not greater than 1,030 DEG C, and controlling the final rolling temperature of precision rolling to be 820-870 DEG C; firstly cooling rolling elements obtained through precision rolling at 12 DEG C/s-24 DEG C/s to 620-690 DEG C; then carrying out air cooling for 5-9 seconds; and then carrying out water cooling to the coiling temperature, and coiling, thereby obtaining the high-intensity hot rolled steel plate roll. According to the invention, the high-intensity hot rolled steel plate roll for the automobile wheels, which has the yield strength of being not less than 685MPa, the tensile strength of 750-950 MPa, and the ductility of 25-41%, can be prepared.

Description

technical field [0001] The invention belongs to the field of ultra-high-strength steel materials, and specifically relates to a low-C, low-Si high-strength hot-rolled steel sheet coil for automobile wheels of 700 MPa and above and a manufacturing method thereof. Background technique [0002] Usually, the ultra-high-strength steel plate manufacturing wheels can reduce the thickness of the plate and improve the utilization rate of materials. At the same time, it can also effectively reduce the weight of the body, reduce fuel consumption and environmental pollution, and will produce good technical and economic effects. [0003] From the current situation, the tensile strength of steel plates for domestic wheels is generally below 590MPa, and steel plates with a grade of ≥600MPa are still blank. According to the development trend of the international automobile wheel steel series products, the demand for wheel steel plates with tensile strength ≥ 600MPa is constantly rising, and...

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Problems solved by technology

[0003] From the current situation, the tensile strength of steel plates for domestic whe

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