High-strength long-fatigue life wheel steel used for heavy truck and manufacturing method thereof

Abstract

The invention relates to a high-strength long-fatigue life wheel steel used for a heavy truck and a manufacturing method thereof, belonging to the technical field of high-strength stamping wheel steel for the heavy truck. The wheel steel comprises the following components: 0.12-0.14% of C, less than or equal to 0.05% of Si, 1.1-1.3% of Mn, 0.008-0.015% of P, less than or equal to 0.003% of S, 0.030-0.060% of Al, 0.015-0.025% of Nb, 0.01-0.02% of Ti, less than or equal to 23ppm of O, less than or equal to 33ppm of N and the balance of Fe and inevitable impurities. The manufacturing process comprises the following steps of: molten iron pretreatment to remove sulphur, top and bottom-blown converter smelting, LF (low frequency) furnace refining, slab casting, hot rolling to obtain the finished product. The wheel steel provided by the invention has the advantages that: compared with the traditional wheel steel, the tensile strength can reach more than 500MPa, the elongation percentage is more than 30%, the flexible life of a manufactured steel ring is more than 500000 times, the radial fatigue life is more than 1450000 times, and the weight of the wheel is reduced by 12-15%. The self weight of a car body is effectively reduced, and the oil consumption is reduced, thus the wheel steel is an ideal plate used for producing wheel rims and wheel arms of the heavy truck.

Description

technical field [0001] The invention belongs to the technical field of high-strength stamping steel for heavy-duty truck wheels, and in particular provides a wheel steel for heavy-duty trucks with high strength and high fatigue life and a manufacturing method thereof. Background technique [0002] At present, the domestic heavy-duty truck market mainly uses 380CL as the main manufacturing material for wheel rims, but its strength and fatigue life are low, and it is very prone to fatigue fractures during the operation of heavy trucks, which may cause car accidents, and the steel rims made of it have relatively low specifications. Thick, increases the weight of the body, is not conducive to energy saving and environmental protection. [0003] In order to make the independent development of my country's automobile industry, especially the field of heavy trucks, and reduce the dependence on foreign imported steel, on the basis of ensuring the plasticity, toughness, rigidity and ...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for manufacturing wheel steel for heavy truck vehicles with high strength and high fatigue life, which solves the problems of low strength, thick steel plates and poor fatigue life of steel for heavy truck wheels in China at present, and makes the vehicle body Weight reduction, fuel consumption reduction and energy saving can be achieved

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