Patent ID: 11931786
Assignee: HYUNDAI STEEL COMPANY
Field: Materials, metallurgy (Chemistry)
Classification: CPC B  C | IPC B  C

Claim 0:
1. A method of manufacturing a part to be hot-stamped, the method comprising:
inserting a blank into a heating furnace, wherein the heating furnace includes heating sections and soaking sections;
step heating the blank as the blank passes through the heating sections;
soaking the blank at a temperature of Ac3 to 1,000° C. as the blank passes through the soaking sections;
transferring the soaked blank from the heating furnace to a press mold;
forming a molded body by hot-stamping the transferred blank; and
cooling the formed molded body, wherein, in the step heating of the blank, a temperature condition in the heating furnace satisfies formula:

0<(Tg—Ti)/Lt<0.025° C./mm

wherein Tg denotes a soaking temperature (° C.), Ti denotes an initial temperature (° C.) of the heating furnace, and Lt denotes a total length (mm) of the heating sections,
wherein the soaking is performed in the soaking sections having same temperature range in the heating furnace,
wherein the blank includes a tailor rolled blank (TRB) having partially different thicknesses obtained by rolling a plate material having a uniform thickness.