GB881331A - Manufacture of nodular iron - Google Patents
Manufacture of nodular ironInfo
- Publication number
- GB881331A GB881331A GB6049/58A GB604958A GB881331A GB 881331 A GB881331 A GB 881331A GB 6049/58 A GB6049/58 A GB 6049/58A GB 604958 A GB604958 A GB 604958A GB 881331 A GB881331 A GB 881331A
- Authority
- GB
- United Kingdom
- Prior art keywords
- calcium
- added
- carbon
- nodularising
- melt
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/10—Making spheroidal graphite cast-iron
Abstract
A preliminary treatment of cast iron containing graphitic carbon to render it susceptible to subsequent nodularising treatment, consists in adding to the molten iron a calcium slag comprising one or more calcium compounds and carbon with or without a fluxing agent, and then adding the nodularising agent, and casting the melt. Calcium compounds used include, limestone; calcium silicide, oxide, carbide or fluoride, or mixtures thereof. Chloride, sulphate, and nitrate of calcium are excluded. Calcium fluoride is used as a flux. The carbon may be in the form of coke, graphite, or calcium carbide. The preferred mixture is 3% limestone, 0,75% fluorspar and 1% coke by weight of the melt. The slag may be added to the top of the melt, and after 10 to 20 mins. tapped into a ladle when the nodularising agent is added. For example, 80% of pig iron containing Si, S, P, Mn and over 4% of carbon is mixed with 20% of "silvery iron" containing Si, and the preferred calcium slag mixture added. After 10 to 20 mins. 0,8% of an alloy containing 5% Misch metal, 20% Mg and 75% Cu are added as nodularising agent. Specifications 727,401 and 732,312 are referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US881331XA | 1957-02-25 | 1957-02-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB881331A true GB881331A (en) | 1961-11-01 |
Family
ID=22209543
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB6049/58A Expired GB881331A (en) | 1957-02-25 | 1958-02-25 | Manufacture of nodular iron |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB881331A (en) |
-
1958
- 1958-02-25 GB GB6049/58A patent/GB881331A/en not_active Expired
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