Cold drawn free-machining steel bar including bismuth
US4741786A · kind A · utility
3Cited by
3References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 10, 1986 |
| Grant date | May 3, 1988 |
| Priority date | — |
| Expiry date | Jun 10, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C38/60
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A cold drawn free-machining steel bar having a composition consisting essentially of, in weight percent, C up to 0.15; Mn 0.7 to 1.3; P 0.03 to 0.09; S 0.30 to 0.50; Bi 0.05 to 0.25; the sum of Ni, Cr, Mo and Cu up to 0.15 and the balance iron. The ratio % Mn / %S is from 1.7 to 3.0 and the %Mn-1.62.times.%S is from 0.05 to 0.40. The ratio %Bi /(%Ni+%Cu) is at least 2.0. The yield strength of the steel bar is further determined by the draft in cold drawing the bar from the hot rolled state and the cross section of the bar prior to draft.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.