What is added as an inoculant in ductile cast iron?
What is added as an inoculant in ductile cast iron?
Inoculant 9 is a very potent alloy that can be used for inoculating both gray and ductile iron. The manganese is added to increase the rate of solubility in iron, thus saving metal temperature.
What is ductile iron composition?
| V-3 65-45-12 ASTM A536 Ductile Iron Chemical Composition | ||
|---|---|---|
| Carbon | Silicon | Manganese |
| 3.5-3.9% | 2.25-3.0% | 0.15-0.35% |
What is SGI material?
SG Iron is also known as Ductile Cast Iron, Nodular Cast Iron, Spheroidal Graphite Iron and Spherulitic Cast Iron. As the name Ductile Iron suggests this grade of Cast Iron has a degree of ductility. The main characteristic of this material is the structure of the graphite.
How do you make ductile cast iron?
Ductile iron (usually hypereutectic) is produced by ”treatment” with magnesium immediately prior to pouring castings (see Fig. 4), followed by inoculation in much the same way as for the production of gray cast iron….Related terms:
- Cast Iron.
- Magnesium.
- Corrosion.
- Ferrite.
- Flanges.
- Steel Pipe.
- Graphite.
- Grey Cast Iron.
Why is cast iron inoculated before pouring?
Inoculation allows fast cooling and favours the formation of metastable carbide formation, which is desirable. It also has a multiplying effect on the formation of nuclei and solidifying of cells in ductile cast iron.
What is inoculant in foundry?
Elkem inoculants for improved cast iron quality Inoculants are FeSi based alloys which contain carefully balanced amounts of active elements designed to control the microstructure and mechanical properties of cast irons.
Can ductile iron be welded?
Ductile Iron can be welded successfully to produce welds that have mechanical properties comparable to those of the base iron. In service, Ductile Iron Pipe showed that expense of repair was practically eliminated. Ductile Iron is usually defined as a Cast Iron with primary graphite in the nodular or spheroidal form.
Where is ductile iron used?
Ductile iron has greater strength and ductility than gray iron. Those properties allow it to be used effectively in a wide variety of industrial applications, including pipe, automotive components, wheels, gear boxes, pump housings, machine frames for the wind-power industry, and many more.
What are the three types of cast iron?
Various types of cast irons are produced using different heat treatment and processing techniques, including gray iron, white iron, malleable iron, ductile iron, and compacted graphite iron.
Which is better ductile iron or cast iron?
When comparing the two, cast iron corrodes more quickly than ductile iron. Ductile iron consists of iron, carbon, silicon, manganese, magnesium, phosphorous and sulphur. This is because they are much stronger than cast iron. Moreover, ductile iron is better than cast iron in difficult terrains.
What is the inoculation of cast iron?
“Inoculation of molten cast iron” refers to the introduction of nuclei into the melt in order to influence the solidification process or structural formation in the casting in a specific way. Nuclei are fine particles that are ≤ 4 µm in size and which serve as crystallization centers for the graphite precipitation.
What kind of inoculant is used for ductile iron?
20meshx 100mesh This is general purpose inoculant used for ductile iron. Increases nodule count, improves nodule shape and decreases chilling tendency. A minimum of 0.2% and a maximum of 1.0% is added as ladle addition. If used as late inoculant, at about 0.1% rate is used.
How to increase nodule count in cast iron?
Cause Œ <0.005% S in base metal treated with 6% Mg, 1% TRE FeSiMg, 1.6% addition at 1500°C. Inoculation Œ 0.5% addition FeSi 4% All in pouring ladle. Remedy Œ increased % S to 0.010- 0.015% in furnace. Result Œ increased nodule count >100mm2, no carbide, no porosity. Inoculation at Low Temperatures Casting Œ continuously cast bar.
Is there a magnesium based inoculant for cast iron?
Magnesium Based Inoculant There are no commercially available ladle or metal stream inoculants containing Mg. However, it is a necessary addition in the production of fiin the mouldfl inoculant blocks utilising powder metallurgical techniques. Typically 0.7-1.7% addition. Impact of Size and Shape on Inoculation In the mould inoculation.
What is the microstructure of Ni resist cast iron?
In this study, the microstructure and mechanical properties of as cast ductile Ni-resist cast iron have been investigated at room temperature. The microstructure consists of graphite nodules embedded in austenitic matrix and carbides. The FeNi3 phase also found in the austenitic matrix.