High-elongation automobile axle housing steel for cold stamping, and production method thereof

Abstract

The invention provides high-elongation automobile axle housing steel for cold stamping, and a production method thereof. The automobile axle housing steel comprises the following components in percentage by weight: 0.14%-0.17% of C, 0.020%-0.080% of Si, 1.25%-1.65% of Mn, 0.010%-0.065% of Al, 0.025%-0.065% of V, 0.15%-0.25% of Cr, not greater than 0.020% of P, not greater than 0.006% of S, and thebalance Fe and inevitable impurities. The production method comprises the steps of smelting, continuous casting, heating, rolling, cooling and coiling. The steel has high elongation under the tensilestrength of 470MPa, and the elongation A is not less than 40%; and integral forming of stamping can be realized by applying the steel plate, no welding is achieved, and the cost is saved.

Description

technical field [0001] The invention belongs to the field of metals, in particular to a high-elongation automobile axle housing steel for cold stamping and a production method thereof. Background technique [0002] The automobile axle housing is one of the main components of the automobile driving system. It supports the weight of the frame and the rear parts of the frame, and at the same time it protects the components in the transmission system. In the manufacturing field of the axle housing industry, there are two completely different product manufacturing methods: stamping and welding axle housings and casting axle housings. With the development of axle housing manufacturing technology and the need for automobile weight reduction and energy saving, especially for truck driven axle housings, hot-rolled steel plates with a thickness of 12 to 16 mm have been used to make stamped and welded axle housings, replacing the complex manufacturing process and production Inefficien...

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Problems solved by technology

[0006] The Chinese patent application with the publication number CN 106480367A discloses a production method of high-strength cold-formed automobile axle housing steel, which is designed by adding a certain amount of niobium, vanadium and titanium through the carbon and manganese elements of the common C-Mn composition system. Solid solution strengthening and fine-grain strengthening of niobium, vanadium, and titanium elements to increase the strength of hot-rolled steel sheets, but the elongation of the steel sheets is up to 22.99%, which does not meet the requirements of difficult-to-form automotive parts

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