Nippon Steel Sumitomo Metal Corporation

Aisin Takaoka Co., Ltd.

Toyota Jidosha Kabushiki Kaisha

Nippon Steel Corporation

Ryozo Wada

Kunio Hayashi

Toshimitsu Aso

Toshimasa Tomokiyo

Hitoshi Tanino

An infrared heating method comprises: wholly infrared heating a steel sheet uniformly up to a temperature which is A3 point or above; and temperature distribution controlling, wherein, after the wholly infrared heating, partial lowering of a light intensity of infrared rays irradiated toward the steel sheet is performed to provide a first region having a temperature of A3 point or above and a second region having a temperature less than A1 point in the steel sheet.

Infrared heating method, infrared heating and forming method of steel sheet and automobile component obtained thereby, and infrared heating furnace

Provided is a method for manufacturing a hot stamped body, the method including: a hot-rolling step; a coiling step; a cold-rolling step; a continuous annealing step; and a hot stamping step, in which the continuous annealing step includes a heating step of heating the cold-rolled steel sheet to a temperature range of equal to or higher than Ac&#xb0; C. and lower than Ac&#xb0; C.; a cooling step of cooling the heated cold-rolled steel sheet from the highest heating temperature to 660&#xb0; C. at a cooling rate of equal to or less than 10&#xb0; C./s; and a holding step of holding the cooled cold-rolled steel sheet in a temperature range of 550&#xb0; C. to 660&#xb0; C. for one minute to 10 minutes.

Method for manufacturing hot stamped body and hot stamped body

The present invention provides a method for manufacturing a hot stamped body, the method including: a hot-rolling step; a coiling step; a cold-rolling step; a continuous annealing step; and a hot stamping step, in which the continuous annealing step includes a heating step of heating the cold-rolled steel sheet to a temperature range of equal to or higher than Ac&#xb0; C. and lower than Ac&#xb0; C.; a cooling step of cooling the heated cold-rolled steel sheet from the highest heating temperature to 660&#xb0; C. at a cooling rate of equal to or less than 10&#xb0; C./s; and a holding step of holding the cooled cold-rolled steel sheet in a temperature range of 550&#xb0; C. to 660&#xb0; C. for one minute to 10 minutes.

Growing community of inventors

Obu, Japan

Ryozo Wada