Patent · US Active

Complex metallographic structured high strength steel and method of manufacturing

US9157138B2 · kind B2 · utility

3Cited by
49References
13Claims
0Family size

Assignee

Inventor

Key dates

Filing dateJan 30, 2013
Grant dateOct 13, 2015
Priority date—
Expiry dateNov 13, 2033

Classification

  • Technology area (CPC Y)Emerging Cross-Sectional Technologies
  • CPC primaryY10T428/12972
  • WIPO fieldMaterials, metallurgy
  • WIPO sectorChemistry

Abstract

A multi-phase steel sheet having microstructure having in combination ferrite, martensite of between 3% and 65% by volume, and at least one microstructure selected from the group consisting of, bainite and retained austenite, and having fine complex precipitates selected from the group of TiC, NbC, TiN, NbN, (Ti.Nb)C, (Ti.Nb)N, and (Ti.Nb)(C.N) particles having at least 50% smaller than 20 nm in size, and physical properties having tensile strength greater than about 780 megapascals and at least one of the properties of elongation greater than about 10%, yield ratio greater than about 70%, and hole expansion ratio greater than about 50%.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.