Method for manufacture of gray cast iron for crankcases and cylinder heads
AssigneeInternational Engine Intellectual Property Company, LLC
InventorJoseph R. Ward
Life of this patent
Estimating the term…
Abstract
A method of casting parts with gray iron includes the steps of providing molten gray iron metal with controlled carbon, silicon, phosphorous, sulfur, manganese and chromium content; alloying said molten gray iron metal, prior to pouring, with tin to a total tin content of about 0.05% to about 0.10%; inoculating said molten tin-alloyed gray iron metal, prior to pouring, with a gray iron inoculant to an additional silicon addition of from about 0.10% to about 0.12%; and casting the gray iron part from said molten, tin-alloyed inoculated gray iron metal as son as possible after said inoculation.
Claims13
A method for the manufacture of crank cases and cylinder heads from gray cast iron, comprising the steps of:
- providing a molten controlled-content gray iron metal having a carbon equivalent of about 4.05%, comprised of about 3.40% to about 3.45% carbon, about 1.80% to about 1.90% silicon with less than about 0.03% phosphorus, while maintaining base iron sulfur at about 0.05% to about 0.07%, manganese at about 1.7 times the percentage of sulfur plus about 0.30% to about 0.40%, and base iron chromium less than about 0.10%;
- transferring said molten controlled-content gray iron metal to a pouring ladle;
- alloying said molten controlled-content gray iron metal with tin in said pouring ladle to a total tin content of about 0.05% to about 0.10% to provide a molten tin-alloyed, controlled-content gray iron metal;
- inoculating said molten tin-alloyed, controlled-content gray iron metal with a gray iron inoculant to a further silicon addition of from about 0.10% to about 0.12%;
- and
- pouring said molten, tin-alloyed, inoculated controlled-content gray iron metal as soon as possible after said inoculation into a casting mold.
An internal combustion engine part cast from a molten controlled-content gray iron metal having a carbon equivalent of about 4.05%, comprised of about 3.40% to about 3.45% carbon, about 1.80% to about 1.90% silicon with less than about 0.03% phosphorus, base iron sulfur of about 0.05% to about 0.07%, manganese of about 1.78 times the percentage of sulfur plus about 0.30% to about 0.40%, and base iron chromium less than about 0.10%, which has been alloyed, prior to casting with tin, to a total tin content of about 0.05% to about 0.10%, and inoculated with a gray iron inoculant to a further silicon addition of from about 0.10% to about 0.12%.
A method for casting internal combustion engine parts with gray cast iron, comprising the steps of:
- providing a molten gray iron metal having a carbon equivalent of about 4.05%, comprised of about 3.40% to about 3.45% carbon, about 1.80% to about 1.90% silicon with less than about 0.03% phosphorus, base iron sulfur of about 0.05% to about 0.07%, manganese of about 1.7 times the percentage of sulfur plus about 0.30% to about 0.40%, and base iron chromium less than about 0.10%;
- alloying said molten gray iron metal prior to pouring with tin to a total tin content of about 0.05% to about 0.10% to provide a molten tin-alloyed gray iron metal;
- inoculating said molten tin-alloyed gray iron metal prior to pouring with a gray iron inoculant to a further silicon addition of from about 0.10% to about 0.12%;
- and
- casting an internal combustion engine part as soon as possible after said inoculation.
Dependencies are inferred from the claim text.