Method of manufacturing high strength steel member with a low yield ratio
US5374322A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 8, 1993 |
| Grant date | Dec 20, 1994 |
| Priority date | — |
| Expiry date | Jul 8, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S148/909
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A high tensile strength, low yield ratio steel member has a steel composition consisting essentially of, by weight: PA1 C: 0.15-0.40%, Si: 0.10-0.70%, Mn: 1.0-2.7%, PA1 Cr: 1.0-3.5%, sol.Al: 0.01-0.05%, PA1 P: not larger than 0.025%, S: not larger than 0.015%, PA1 Mo: 0-1.0%, Ni: 0-2.5%, PA1 V: 0-0.10%, Ti: 0-0.10%, Nb: 0-0.10%, PA1 B: 0-0.0050%. Fe and incidental impurities: balance the below-described bainite index (%) of the steel composition being 0-50%, the steel being comprised of a single phase of martensite or a martensite and bainite duplex structure containing 50% or less of bainite. EQU Bainite Index (%)=-209C+43Si-48Mn-58Cr-0.416R+317 wherein R is a cooling rate (.degree.C./min).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.