A kind of 1000mpa grade hot-rolled automobile beam steel and its manufacturing method

Abstract

The invention discloses 1000 MPa-grade hot-rolled automotive frame steel and a producing method thereof. The raw materials of the steel comprise the chemical components including, by mass, 0,10-0.20%of C, not greater than 0.10% of Si, 1.5-1.7% of Mn, not greater than 0.005% of S, not greater than 0.015% of P, 0.045-0.055% of Nb, 0.08-0.10% of Ti, not greater than 40 ppm of N, 0.025-0.060% of Als,not greater than 0.002% of H and the balance Fe. According to a hot-rolled steel plate produced through the method, the yield strength is greater than or equal to 750 MPa, the tensile strength is greater than or equal to 1000 MPa, the elongation is greater than or equal to 10%, and cold bend positions are free of cracks and a good cold bend effect is achieved under the conditions that the wide cold bend is 180 degrees and the cold bend flexual center diameter D is equal to 4t (thickness). The technological flow adopted by the method is simple, no equipment needs to be additionally arranged, and the steel has the advantages of being capable of being produced on a large scale, economical, feasible and stable in performance.

Description

technical field [0001] The invention relates to a hot-rolled automobile frame steel and a manufacturing method thereof, in particular to a 1000MPa grade hot-rolled frame steel with excellent cold bending performance and a manufacturing method thereof, belonging to the field of hot-rolled automobile frame steel manufacturing. Background technique [0002] Hot-rolled automobile frame steel is widely used in commercial vehicles in my country and is widely used in various commercial vehicle enterprises, but the application strength level is relatively low, and the tensile strength is 510-700MPa. With the implementation of the "New National Standard 1589", domestic heavy-duty commercial vehicle manufacturers are actively promoting the upgrading of materials to realize the lightweight of heavy-duty commercial vehicles. The high strengthening of automobile frame steel is an important technical path to realize automobile lightweight, and it is also a future development trend. [00...

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Problems solved by technology

[0006] From the above comparative patents, it can be seen that these patents have the following disadvantages: (1) A certain amount of expensive alloy elements, such as Ni, Cr, Mo, etc., are added, and the cost of steel is high

(2) The process is complicated, generally need to go through rolling + heat treatment process, the process is long

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