Thick specification 1300mpa hot forming steel for wheel spoke and its preparation method

Abstract

The invention discloses thick 1300MPa-level thermoforming steel for spokes. The thick 1300MPa-level thermoforming steel comprises, by weight percentage, 0.20-0.24% of C, 0.20-0.30% of Si, 1.10-1.50% of Mn, not more than 0.010% of P, not more than 0.004% of S, 0.020-0.040% of Ti, 0.0030-0.0040% of B and the balance Fe and inevitable impurities, wherein the thickness of the steel is 3.0-10.0mm. Thethick 1300MPa-level thermoforming steel has the advantages reasonable chemical components and hot rolling process are adopted, the ferrite plus pearlite structure small in grain size is obtained, thethermoforming steel board good in comprehensive mechanical performance is obtained, the tensile strength of the board is not larger than 650MPa, the yield strength of the board is not larger than 540MPa, and the elongation percentage of the board is not smaller than 27%; after the conventional thermoforming process, the tensile strength of the thermoforming steel is not smaller than 1300MPa, the yield strength of the thermoforming steel is not smaller than 1000MPa, and the elongation percentage of the thermoforming steel is not smaller than 10%.

Description

technical field [0001] The invention relates to the technical field of hot-rolled steel for automobiles, in particular to a 1300MPa-grade hot-formed steel for wheel spokes and a preparation method thereof. Background technique [0002] The automobile industry in the 21st century, reducing fuel consumption and reducing CO 2 And exhaust emissions have become the needs of the society. In order to adapt to this development trend, the steel industry as a material production plant has developed many types of ultra-high-strength steel plates to help reduce the weight of automobiles and meet the new requirements of the automobile industry. [0003] Using the traditional cold stamping process to process ultra-high-strength steel plates not only has many technical obstacles, such as the springback of stamping parts, die loss, etc.; at the same time, it puts forward extremely high requirements on the performance of the material, which makes the price of the material high and hinders L...

AI Technical Summary

Problems solved by technology

These patents produce thin-gauge hot-formed steel, which is used for safety and structural parts of automobiles, and cannot be used for the manufacture of wheels

The document with the patent number 201810208962.4 discloses a hot-formed steel with a tensile strength of 950 MPa and its hot-rolling process. The invention adopts a hot-rolling process to produce thick-gauge hot-formed steel, but its tensile strength after hot-forming is low, only About 1000MPa, which cannot meet the high-strength and light-weight requirements of commercial vehicle wheels

Images