Steel for high strength automobile axle housing for cold stamping and production method thereof

Abstract

The invention provides steel for a high strength automobile axle housing for cold stamping and a production method thereof. The steel is prepared from the following components in percent by weight: 0.040-0.090% of C, 0.020-0.080% of Si, 1.35-1.65% of Mn, 0.010-0.065% of Al, 0.025-0.065% of Nb, 0.015-0.030% of Ti, 0.15-0.25% of Cr, 0.003-0.01% of Ce, less than or equal to 0.020% of P, less than orequal to 0.06% of S and the balance Fe and inevitable impurities. The production method comprises smelting, continuous casting, heating, rolling, cooling and coiling. A steel plate produced by the production method has relatively high ductility and impact value at high tensile strength of 710 MPa, and the transverse ductility A is greater than or equal to 31% and the impact value at 0 DEG C is greater than or equal to 172 J.

Description

technical field [0001] The invention belongs to the field of metal materials, in particular to a method for producing high-strength automobile axle housing steel for cold stamping. 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 Inefficient, b...

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Problems solved by technology

[0005] The Chinese patent application with the notification number CN 103805862 B discloses the steel for the axle housing and its preparation method. It uses the common C-Mn composition system to design and add a variety of micro-alloying elements. The hot-rolled steel plate produced needs subsequent modulation and heat treatment. , high production cost

However, the highest tensile strength of the steel plate is 610MPa, which cannot meet the requirements of high-strength formed auto parts

[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 to add a certain amount of niobium, vanadium, titanium through carbon and manganese elements by using the common C-Mn composition system. Solid solution strengthening and fine-grain strengthening of niobium, vanadium, and titanium elements to increase the strength of the hot-rolled steel plate produced, but the highest tensile strength of the steel plate is 642MPa, which does not meet the requirements of high-strength formed auto parts

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