Method for the production of ductile cast iron
US5373888A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 15, 1993 |
| Grant date | Dec 20, 1994 |
| Priority date | — |
| Expiry date | Apr 15, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N33/205
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
During production of ductile cast iron, controlling and correcting the composition of the cast iron melt, including extracting a sample from the melt, the mother melt, and adding an amount of an oxide, a sulphite or an oxy-sulphide with the ability to oxidize an amount of the modifying agent present in the sample and corresponding to the fading rate expected to occur during the casting process as a whole. The sample is permitted to solidify in a sample vessel equipped with two thermocouples, one in the center of the sample vessel and the other in the vicinity of the sample vessel wall. The temperature and time are recorded during the process of solidification in a manner known per se and nodularity is calculated. If the amount of modifying agent is too low to secure a fully nodular graphite throughout the whole casting period, an appropriate amount of modifying agent is added.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.