METHOD FOR PRODUCING ULTRA HIGH STRENGTH MEMBER AND USE OF ULTRA HIGH STRENGTH MEMBER

摘要

I delayed fracture properties are excellent hot can be manufactured at low cost ultra-high strength tensile member according to the press method, which strength (TS) to provide a manufacturing method and use of the ultra-high strength 1180 or more members. Heating the steel sheet in a first heating temperature in the temperature range of 700 ~ 1000 , and that the first heating temperature at the start of cooling at the same time as forming a part shape, and subjected to shear to the desired shape after the punching process by the cooling end A method for producing ultra-high strength member, the front end after the punching processing, 100 over heating in the second heating temperature in the temperature range of less than 300 and also the holding time in the second heating temperature is 1 second to 60 minutes claim 1, a heat treatment, the tensile strength of the resulting ultra-high strength member at least 1180 .