A kind of wheel steel with excellent welding performance and its production method

Abstract

The invention provides wheel steel with excellent welding performance. Components of the wheel steel comprise, by weight percent, 0.031-0.061% of C, 0.250-0.350% of Si, 1.35-1.55% of Mn, smaller thanor equal to 0.005% of P, smaller than or equal to 0.0015% of S, smaller than or equal to 0.0015% of O, smaller than or equal to 0.0020% of N, 0.015-0.045% of Als, 0.010-0.020% of Nb. According to a production method, the steel enters an LF furnace to be refined after being smelted through a converter; RH vacuum treatment is carried out; continuous casting is carried out, and a casting blank is heated; rough rolling is carried out; high-pressure phosphorous removal is carried out two times continuously; first pass refining is carried out; high-pressure phosphorous removal is carried out; follow-up pass finish rolling is carried out; superfast cooling is carried out; rolling is carried out; and leveling is carried out. According to the wheel steel, it is ensured that the thickness of a product is 10-18 mm, the lower yield strength of the steel is 340-480 MPa, the tensile strength is 470-630 MPa, the ductility A80 is larger than or equal to 32%, after the material is subjected to flash butt welding, a transverse sample is 180 degree, the flexual center diameter d is equal to 0a to be qualified, pits on the surface of a steel plate can be eliminated, and thus the forming reject ratio after welding is reduced to one thousand percent and below.

Description

technical field [0001] The invention relates to a hot-rolled steel and a production method, and belongs to a hot-rolled wheel rim steel and a production method. Background technique [0002] The structure of the wheel mainly includes the spoke and the rim. The production method of the spoke is generally mechanical stamping, so the wheel steel for the spoke is required to have good deep drawing performance, stretch forming performance and shear edge tensile performance. The rim is rolled and formed after flash butt welding. Therefore, the wheel steel used for the rim is required to have good welding performance and post-weld forming performance, such as cold bending performance, fatigue performance, etc. If the welding performance is poor, it will cause bursting and extension. The low rate will form cracks during the rolling process, which will affect the yield of wheel products. The car wheel carries the weight of the entire vehicle and has very strict quality requirements....

AI Technical Summary

Problems solved by technology

The material of this invention has low strength and can only be used on the wheels of passenger cars. It cannot adapt to the development and use trend of high-strength materials in the current price range, and can only meet the requirements of low-strength and excellent service conditions in the use environment, and cannot meet off-highway requirements. Requirements for the use of wheel steel

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