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Method for producing gray cast iron for machine

A production method and technology of gray cast iron, which is applied in the field of casting technology of high-strength and low-alloyed gray cast iron, can solve the problems that cannot be widely promoted, gray cast iron is not high in strength, and the life of castings is low, so as to achieve easy quality control, high resistance Tensile strength and castability, the effect of good castability

Active Publication Date: 2013-10-09
RIYUE HEAVY IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently used production method of gray cast iron for the machine body often produces gray cast iron with low strength or poor casting performance, resulting in low casting life and cannot be widely promoted.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The production method of gray cast iron for the body of this embodiment, the specific operation steps are as follows:

[0016] (1) Weigh the raw materials with the following mass percentages: 78% of steel scrap, 18% of returned material, and 2.4% of KC-A carburizer;

[0017] (2) Put all the scrap steel and returned charge into the furnace, add 70% carburant, heat to melt the charge, add the remaining 30% carburant when the charge is melted to about 95%, and wait for the charge to melt Then add Cu alloy, the amount of Cu alloy added is 0.45% of the total mass of steel scrap, return material and recarburizer. After the Cu alloy is melted to obtain the original molten iron, continue to heat the original molten iron to 1475°C;

[0018] (3) Add the inoculant strontium ferrosilicon alloy by the flushing method to inoculate the original molten iron. The particle size of the inoculant is 3~8mm, and the amount of the inoculant added is 0.3% of the mass of the original molten iro...

Embodiment 2

[0022] The production method of gray cast iron for the body of this embodiment, the specific operation steps are as follows:

[0023] (1) Weigh the raw materials with the following mass percentages: 71% scrap steel, 26% recycled materials, and 1.2% KC-A carburizer;

[0024] (2) Put all the scrap steel and returned charge into the furnace, add 70% carburant, heat to melt the charge, add the remaining 30% carburant when the charge is melted to about 95%, and wait for the charge to melt Then add Cu alloy, the amount of Cu alloy added is 0.52% of the total mass of steel scrap, return material and recarburizer. After the Cu alloy is melted to obtain the original molten iron, continue to heat the original molten iron to 1460°C;

[0025] (3) Add the inoculant strontium ferrosilicon alloy by the flushing method to inoculate the original molten iron. The particle size of the inoculant is 3~8mm, and the amount of the inoculant added is 0.35% of the mass of the original molten iron. liq...

Embodiment 3

[0029] The production method of gray cast iron for the body of this embodiment, the specific operation steps are as follows:

[0030] (1) Weigh the raw materials with the following mass percentages: 74% of steel scrap, 23% of returned material, and 2.1% of KC-A carburizer;

[0031] (2) Put all the scrap steel and returned charge into the furnace, add 70% carburant, heat to melt the charge, add the remaining 30% carburant when the charge is melted to about 95%, and wait for the charge to melt Then add Cu alloy, the amount of Cu alloy added is 0.45% of the total mass of steel scrap, return material and recarburizer. After the Cu alloy is melted to obtain the original molten iron, continue to heat the original molten iron to 1472°C;

[0032] (3) Add the inoculant strontium ferrosilicon alloy by the flushing method to inoculate the original molten iron. The particle size of the inoculant is 3~8mm, and the amount of the inoculant added is 0.23% of the mass of the original molten ir...

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PUM

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Abstract

The invention provides a method for producing gray cast iron used for a machine. The method comprises the following steps of: weighing raw materials, wherein the raw materials comprise 70-90% of steel scrap, 8.8-28.8% of foundry returns and 1.2-2.5% of a recarburizer; adding the steel scrap, the foundry returns and 70% of the recarburizer into a furnace, and heating to melt; adding the left 30% of the recarburizer after 90-95 percent of the materials are melted; adding Cu alloy after all the materials are melted, wherein the addition amount of the Cu alloy is 0.35-0.6% of the total mass of the steel scrap, the foundry returns and the recarburizer; melting the Cu alloy to obtain raw melted iron; continuing to heat the raw melted iron to the temperature of 1,450-1,480 DEG C; adding an inoculating agent, wherein the addition amount of the inoculating agent is 0.1-0.3% of the mass of the raw melted iron; stirring uniformly to obtain melted iron; standing the melted iron; and casting a workpiece by the melted iron when the temperature is decreased to 1,380-1,400 DEG C, and cooling to obtain the gray cast iron used for the machine. The gray cast iron produced by adopting the method disclosed by the invention has high tensile strength and good casting performance.

Description

technical field [0001] The invention relates to the technical field of casting technology of high-strength and low-alloyed gray cast iron, in particular to a production method of gray cast iron for machine bodies. Background technique [0002] The body needs to withstand high mechanical stress and thermal stress, and it must have good cross-sectional uniformity (including performance, structure, and uniform composition), as well as excellent mechanical properties (tensile strength) and casting properties. However, the currently used production method of gray cast iron for the body usually has low strength or poor casting performance, resulting in low casting life and cannot be widely promoted. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a production method of gray cast iron for machine body, the gray cast iron prepared by the method has higher tensile strength and better casting performance. [0004] The tec...

Claims

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Application Information

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IPC IPC(8): C22C33/08
Inventor 张坤傅明康宋贤发
Owner RIYUE HEAVY IND