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US 7,442,261 B2Granted
Iron-base alloy containing chromium-tungsten carbide and a method of producing it
AssigneeProengco Tooling AB
InventorsAnders Nilsson, Jan-Eric Ståhl
Life of this patent
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Abstract
In a method of producing an iron-based alloy containing chromium carbide, pieces of cemented carbide are added to an iron-based melt containing carbon, e.g. cast iron. Chromium, which regulates the solution of WC into the melt, is also added. The molten alloy is then cast. An alloy comprising chromium-tungsten-carbide in a ferrous matrix is produced. Uses of the alloy are claimed.
Claims24
A method for producing a high wear resistance alloy comprising the steps of:
- melting an existing known base white cast iron alloy having a known composition and a certain iron and carbon content;
- adding carbon to the base white cast iron melt in the form of pieces comprising tungsten carbide for complete dissolution by diffusion and thereby increasing the carbon content of the base alloy melt, the tungsten carbide providing a known content relation between tungsten and carbon;
- adding chromium to said base alloy in an amount sufficient for controlling the solubility of tungsten carbide in the base alloy melt and for providing material for carbide formation;
- and
- casting the resulting alloy melt and thereby forming a final alloy with an additional precipitated carbide structure comprising chromium and the carbon added in the form of tungsten carbide, wherein tungsten is substitutionally dissolved in the lattice structure of said chromium carbide structure.
2 more elements
A method for producing a high wear resistance alloy comprising the steps of:
- melting an existing known base white cast iron alloy having a known composition and a certain iron and carbon content;
- adding carbon to the base white cast iron melt in the form of pieces comprising tungsten carbide for complete dissolution by diffusion and thereby increasing the carbon content of the base alloy melt, the tungsten carbide providing a known content relation between tungsten and carbon;
- adding chromium to said base alloy for controlling the solubility of tungsten carbide in the base alloy melt and for providing material for carbide formation;
- and
- casting the resulting alloy melt and thereby forming a final alloy with an additional precipitated carbide structure comprising chromium and the carbon added in the form of tungsten carbide, wherein tungsten is substitutionally dissolved in the lattice structure of said chromium carbide structure, and wherein the resulting high wear resistance alloy comprises by weight 2-3.5% carbon, between 5% and 20% tungsten, and between 20% and 30% chromium, the balance being iron and other alloying components.
2 more elements
A method for producing a high wear resistance alloy comprising the steps of:
- melting an existing known base cast iron alloy having a known composition and a certain iron and carbon content;
- adding carbon to the melt by adding pieces to the melt each in the form of waste, surplus or worn-out cemented carbide product comprised of tungsten carbide providing a known tungsten to carbon ratio for complete dissolution by diffusion therein and thereby increasing the carbon content thereof;
- adding chromium to the melt in an amount sufficient to control the solubility of the tungsten carbide added to the melt and to provide material for carbide formation;
- and
- casting the resulting melt with the resulting alloy comprised of a precipitated carbide structure that includes chromium from the added chromium and carbon from the added tungsten carbide forming a lattice chromium carbide structure that is further comprised of substitutionally dissolved tungsten from the added tungsten carbide.
2 more elements
A method for producing a high wear resistance alloy comprising the steps of:
- melting white cast iron alloy having a known composition and a certain iron and carbon content;
- adding carbon to the base white cast iron melt in the form of pieces of waste, surplus, or worn-out products that are comprised of tungsten carbide for complete dissolution by diffusion and thereby increasing the carbon content of the base alloy melt, the tungsten carbide providing a known content relation between tungsten and carbon;
- adding chromium to said base alloy for controlling the solubility of tungsten carbide in the base alloy melt and for providing material for carbide formation;
- and
- casting the resulting alloy melt and thereby forming a final alloy with an additional precipitated carbide structure comprising chromium and the carbon added in the form of tungsten carbide, wherein tungsten is substitutionally dissolved in the lattice structure of said chromium carbide structure, and wherein the resulting high wear resistance alloy comprises by weight 2.5-3.5% carbon, between 8-12% tungsten, and between 20-28% chromium, the balance being iron and other alloying components.
2 more elements
Dependencies are inferred from the claim text.