The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
A steel sheet with a metallographic structure in a thickness ¼ portion includes, by volume percentage, ferrite: 10% or more and less than 50%, granular bainite: 5% or more and less than 40%, martensite: 30% or more and 55% or less, upper and lower bainite: less than 30% in total, pearlite: less than 10%, and residual austenite: less than 5%, a proportion of the number of the martensites adjacent to the ferrite to the number of the metallographic structures adjacent to the ferrite is 30% or less in the thickness ¼ portion, and the difference between the absolute maximum and minimum values of Vickers hardness at a load of 50 gf obtained at an interval of 30 μm from a position of a depth of 100 μm in a sheet thickness direction from a surface of the steel sheet to a thickness middle portion position is 60 HV or less.
