The invention relates to a column B for a vehicle and a manufacturing method. The column B comprises a column B body and is characterized in that a hard region part is arranged at the upper portion of the column B body, a soft region part is arranged at the lower portion of the column B body, a transitional region is arranged between the hard region part and the soft region part, a reinforcing board is arranged on the hard region part, the hard region part is of a martensitic structure with the strength ranging from 1300 MPa to 1500 MPa, and the soft region part is of a ferrite and pearlitic structure or a bainite structure with the strength ranging from 500 MPa to 700 MPa. The manufacturing method of the column B for the vehicle includes the following steps that firstly, a contour material sheet of the column B and a contour material sheet of the reinforcing board are welded together according to requirements, so that blanks are acquired; secondly, the blanks are placed in a heating furnace together so as to be heated and austenitized; thirdly, the austenitized blanks are thermally formed in a die together and meanwhile, quenching is conducted, wherein heat of the soft region part is preserved and the ferrite and pearlitic structure or the bainite structure is acquired through slow cooling. One-time thermal forming is adopted, extra tools are not needed, and the requirement of the vehicle for light weight is met.
Column B for vehicle and manufacturing method
2015-05-06
Patent
Elektronische Ressource
Englisch
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