390MPa-grade automobile axle housing steel for hot stamping and production method of 390MPa-grade automobile axle housing steel

Abstract

The invention discloses 390MPa-grade automobile axle housing steel for hot stamping and a production method thereof. The 390MPa-grade automobile axle housing steel comprises the following chemical components in percentage by weight: 0.075%-0.155% of C, 0.05%-0.20% of Si, 1.15%-1.45% of Mn, 0.010%-0.062% of Al, 0.004%-0.035% of Ti, 0.045%-0.105% of V, 0.08%-0.11% of Mo, 0.0010%-0.0030% of B, 0.010%-0.018% of rare earth elements La + Ce, 0.0011%-0.0030% of Ca, less than or equal to 0.010% of P, less than or equal to 0.005% of S, less than or equal to 0.003% of N and the balance of Fe and impurities. After hot stamping, the yield strength is larger than or equal to 415 MPa, the tensile strength is larger than or equal to 510 MPa, and A50 is larger than or equal to 36%.

Description

technical field [0001] The invention relates to the field of metal materials, in particular to a 390MPa-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 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 continuous-rolled steel plates have been used to make punched and welded axle hous...

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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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