Preparation method of high-strength 550L automobile beam steel

Abstract

The invention discloses a preparation method of high-strength 550L automobile beam steel, which comprises the steps of enabling beam steel to comprise the following components: 0.080-0.11 wt% of C, less than or equal to 0.20 wt% of Si, 0.55-0.65 wt% of Mn, less than or equal to 0.018 wt% of P, less than or equal to 0.004 wt% of S, 0.045-0.060 wt% of Ti, 0.020-0.035 wt% of Al, 0.0030-0.0045 wt% of N and less than or equal to 0.0020 wt% of steel TO; performing converter smelting tapping control, wherein [C] is 0.06-0.08%, [P] is less than or equal to 0.015%, [S] is less than or equal to 0.008% and [O] is less than or equal to 400PPm, during converter tapping, fluorite, calcium carbide and active lime are mixed according to a mass ratio of 1:1:3, and are added in three times according to the interval of 1 minute, 2 minutes and 3 minutes in the converter tapping process, and the adding target value is 600 kg per converter; performing oxygen determination before LF refining treatment; and performing continuous casting, wherein continuous casting molten steel is cast under the protection of argon, the heating temperature of a plate blank is 1210-1230 DEG C, a hot-rolled coil with the thickness of 3.0-10 mm is obtained by adopting a hot continuous rolling mill through rolling, and the finish rolling temperature is 854-858 DEG C.

Description

[0001] Inventors; Wu Tower 210102197508015633, Zhao Liang, Feng Yueping Technical field [0002] The present invention relates to a preparation method of high strength 550L automobile millennium steel, producing a high-strength, high toughness, and excellent automotive barrel steel, which belongs to the field of steel metallurgy. Background technique [0003] High-intensity Automotive Gillo Steel is mainly made in a frame of car cranes. The frame is the loader of the truck, composed of vertical, beams, etc. The components are assembled by cold stamping or rolling. Therefore, the automotive chassis frame is the most important security component of the truck and the trailer. The load-bearing automotive chassis carrier is the key direction of the development of the automotive industry. It uses high-strength automotive bullying steel to reduce the thickness of steel plate and the amount of use, and reduce the self-weight of the car is the development direction. The machining method of...

AI Technical Summary

Problems solved by technology

[0012] Aiming at the low strength of the 510L automobile frame steel currently used in the market, the thickness of the steel plate required for processing the frame, the self-heaviness of the automobile and other deficiencies, the present invention proposes a preparation method of a high-strength 550L automobile frame steel, which can eliminate the longitudinal defects of high-strength automobile frame steel. Disadvantages such as warping after cutting (steel strips) and difficulty in cold forming. While improving the strength of the steel, it also improves the cold stamping performance and use efficiency of the steel.

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