| 摘要 |
PROBLEM TO BE SOLVED: To provide a hot press component having excellent delayed fracture resistance which cannot be achieved by prior art even for a hot roll press component to which tensile strength of 1180 MPa or more is added.SOLUTION: There is provided a hot press component having a composition component containing, by mass%, C:0.1 to 0.4%, Si:2.0% or less (excluding 0%), Mn:0.3 to 3.5% and Ti:0.01 to 0.2% and the balance iron with inevitable impurities, a micro structure containing martensite and retained austenite with an area ratio of 80% or more and the balance ferrite, and containing alloy carbonitride:0.05 mass% or more, the alloy carbonitride having consistency with a parent phase of 5.0×10/mor more and cementite of 2 mass% or less. |
