900MPa-grade hot-rolled automobile beam steel and manufacturing method thereof

Abstract

The invention discloses a 900MPa-grade hot-rolled automobile beam steel and a production method thereof. The 900MPa-grade hot-rolled automobile beam steel comprises raw material chemical ingredients in percentage (%) by weight as follows: 0.06 to 0.08% of C, less than or equal to 0.10% of Si, 1.5 to 1.7% of Mn, greater than or equal to 0.005% of S, greater than or equal to 0.015% of P, 0.040 to 0.050% of Nb, 0.07 to 0.09% of Ti, greater than or equal to 40 ppm of N, 0.025 to 0.060% of Als, greater than or equal to 0.002% of H, and the balance of Fe. Yield strength of a hot-rolled steel plate produced by the method disclosed by the invention is greater than or equal to 650 MPa, tensile strength of the hot-rolled steel plate is greater than or equal to 900 MPa, and elongation percentage of the hot-rolled steel plate is greater than or equal to 12%, the steel plate has an excellent plate shape, unevenness of the steel plate is less than or equal to 0.6%, and carbon equivalent w is less than or equal to 0.35%, and the steel plate has excellent welding performance. The method adopts simple process flow, does not need to add any equipment, and has the advantages of mass production, economy, easiness and stable performance.

Description

technical field [0001] The invention relates to a 900MPa grade hot-rolled automobile frame steel and a manufacturing method thereof, in particular to a 900MPa grade hot-rolled automobile frame steel with good plate shape and excellent welding 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 i...

AI Technical Summary

Problems solved by technology

[0006] From the above comparative patents, it can be seen that these patents have one or two of the following deficiencies: (1) A certain amount of expensive alloying 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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