Process for Production of Compacted Graphite Iron

a graphite iron and compacted technology, applied in the field of cast iron production, can solve the problems of affecting the cooling rate of the base iron, the sulphur level of the base iron is often variable, and the structure is sensitive to the cooling rate variation
US20090183848A1Inactive Publication Date: 2009-07-23NOVACAST
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Patent Information

Authority / Receiving Office
US ยท United States
Patent Type
Applications(United States)
Current Assignee / Owner
NOVACAST
Publication Date
2009-07-23
Estimated Expiration
Not applicable ยท inactive patent

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Abstract

A process for production of compacted graphite iron using in-mould addition of a magnesium alloy is disclosed. The process is characterised by a step of pre-treating the base iron in a ladle or in a furnace with an alloy containing cerium and performing a structure forming treatment in a reaction chamber in the mould using an alloy containing magnesium and lanthanum.
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Description

FIELD OF THE INVENTION

[0001] The invention relates to a process for production of cast iron with a structure predominantly consisting of compacted graphite shapes. The process is based on a combination of pre-treatment of a base iron and a final treatment in the mould.BACKGROUND ART

[0002] Compacted graphite iron is a cast iron alloy with a graphite structure between flake type graphite shapes and spherical shapes. The graphite shape is determined by the conditions in the liquid iron during the solidification. Treatment of a base iron, preferably with a carbon equivalent between 4.0 and 4.4 and with a sulphur content below 0.02%, with a ferrosilicon alloy containing 4-10% magnesium can be used to achieve the compacted graphite structure. The magnesium content must be kept within very narrow limits usually within + / โˆ’ 0.003% and with a level of about 0.008 to 0.015% depending on conditions of the base iron and the cooling rate in the casting to be produced. As used herein percent refers ...

Claims

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