Cold-rolled steel sheets or hot-dip galvanized cold-rolled steel sheets for deep drawing
US5133815A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 1, 1991 |
| Grant date | Jul 28, 1992 |
| Priority date | — |
| Expiry date | Mar 1, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C2/40
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Cold-rolled steel sheets or hot-dip galvanized steel sheets for deep drawing which have excellent resistance to cold-work embrittlement, containing, all by mass, 0.01% or less C, 0.2% or less Si, 0.05-1.0% Mn, 0.10% or less P, 0.02% or less S, 0.005-0.08% sol.Al, and 0.006% or less N, containing Ti (%) and/or NB (%) solely or in combination within the range in which a relationship between the effective amount of Ti (hereinafter referred to as Ti*) defined by the following formula (1) and the amounts of Nb and C satisfies the following formula (2), and further containing 0.003% or less B when required. EQU Ti*=total Ti-{(48/32).times.S+(48/14).times.N}TM (1) EQU 1.ltoreq.(Ti*/48+Nb/93)/(C/12).ltoreq.4.5 (2) And the balance of Fe and inevitable impurities, the steel sheets have a concentration gradient as a result of carburizing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.