600MPa-grade automobile axle housing steel for hot stamping and production method of 600MPa-grade automobile axle housing steel

Abstract

The invention discloses 600MPa-grade automobile axle housing steel for hot stamping and a production method thereof. The 600MPa-grade automobile axle housing steel comprises the following chemical components in percentage by weight: 0.240%-0.335% of C, 0.08%-0.65% of Si, 1.75%-2.25% of Mn, 0.010%-0.065% of Al, 0.046%-0.085% of Nb, 0.052%-0.102% of Ti, 0.054%-0.102% of V, 0.10%-0.46% of Cr, 0.12%-0.26% of Mo, 0.0014%-0.0035% of B, 0.033%-0.042% of La + Ce, 0.0014%-0.0050% of Ca, less than or equal to 0.010% of P, less than or equal to 0.005% of S and less than or equal to 0.003% of N. The yield strength of the steel plate is not less than 600 MPa, the tensile strength is not less than 780 MPa, and the transverse elongation A50 is not less than 28%.

Description

technical field [0001] The invention relates to the field of metal materials, in particular to a 600 MPa grade automobile axle housing steel for hot stamping and a production method thereof. It is mainly used in the manufacture of steel for automobile axle housings for hot stamping. Background technique [0002] The axle housing is one of the main components of the vehicle 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 field of axle housing industry manufacturing, there are two completely different product manufacturing methods: punching and welding axle housings and casting axle housings. With the development of axle housing manufacturing technology and the need for vehicle weight reduction and energy saving, especially for the axle housings driven by trucks, 12-16mm thick hot-rolled steel plates have been used to make punched and welded axle housings, r...

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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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