Method for manufacturing quenched molding, method for manufacturing hot press steel material, and hot press steel material

A method for manufacturing a quenched molding, the method comprising:

• a first processing comprising heating a blanked steel material to a first heat treatment temperature, the first heat treatment temperature being in a range of from an Ac3 transformation point+70° C. to the Ac3 transformation point+170° C., to perform austenite transformation, wherein the Ac3 transformation point is a temperature defined by Equation (1), and then cooling to induce martensite transformation or bainite transformation, wherein the blanked steel material has a chemical composition comprising, in mass %, C:
• from 0.3% to 0.8%, Si:
• from 0.001% to 2.0%, Mn:
• from 0.5% to 3.0%, P:
• not greater than 0.05%, S:
• not greater than 0.01%, sol. Al:
• from 0.001% to 1.0%, N:
• not greater than 0.01%, and B:
• not greater than 0.01%, and a remainder comprising Fe and impurities;
• a second processing comprising heating the steel material that has undergone the first processing to a second heat treatment temperature, the second heat treatment temperature being in a range of from the Ac3 transformation point+20° C. to the Ac3 transformation point+100° C., to perform austenite transformation, and then cooling to induce martensite transformation, wherein a heating time from reaching said second heat treatment temperature until an end of heating in said second processing is 400 seconds or shorter;
• and
• after the steel material has been heated to a temperature higher than the Ac3 transformation point in at least one of the first processing or the second processing, completing molding at a temperature higher than a Ar3 transformation point,
• wherein:
• Equation (1):
• Ac3(° C.)=910−203×√C (mass %)+44.7×Si (mass %)−30×Mn (mass %)−11×Cr (mass %)+700×S (mass %)+400×Al (mass %)+50×Ti (mass %)
• a rate of temperature increase in the first processing, defined as a rate of temperature increase until reaching the first heat treatment temperature, is at least 20° C./second;
• and
• a rate of temperature increase in the second processing, defined as a rate of temperature increase until reaching the second heat treatment temperature, is at least 20° C./second.