Carbon or low-alloy steel with improved machinability and process of manufacture of that steel
US6200527A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 6, 1998 |
| Grant date | Mar 13, 2001 |
| Priority date | — |
| Expiry date | Jul 6, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12431
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A carbon or low-alloy steel is provided with improved machinability. The carbon content of the steel is less than 1.5% and the sum of the alloy elements contained therein is less than 9%. The steel contains oxide and sulfide inclusions, and the chemical composition of the steel includes 0.1%.ltoreq.Mn, 0.01%.ltoreq.Al.ltoreq.0.05%, 0.025%.ltoreq.S.ltoreq.0.3%,0.002%.ltoreq.Ca, O.ltoreq.0.0015% by weight; the "KO oxides" cleanness index is less than 30, all the oxides are lime aluminates, and the average calcium content of type 2, type 3, type 4 and type 5 inclusions is less than 30%. A process of manufacturing such steel and an oxide-core wire for its manufacture are also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.