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Preparation method for high strength gray cast iron material

A grey cast iron, high-strength technology, applied in the field of preparing HT250 high-strength grey cast iron material, can solve the problems of low performance stability and achieve the effect of improving the inoculation effect

Inactive Publication Date: 2014-02-26
丹阳市锦雄机械制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a problem of low performance stability when preparing HT250 high-strength cast iron under non-alloying conditions

Method used

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Examples

Experimental program
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preparation example Construction

[0012] A method for preparing a high-strength gray cast iron material, comprising the following steps:

[0013] 1. Ingredients: In terms of weight percentage, the original molten iron composition: C: 3.2-3.4%, Si: 1.8-2.1%, Mn: 0.5-0.7%, sulfur S: 0.09-0.12%, phosphorus P: 0.10-0.17%, the rest is iron;

[0014] 2. Punch scrap steel and ferromanganese in front of the furnace: tapping temperature is 1450-1460°C, put 3-5% (ladle capacity) scrap steel into the ladle at 400-500°C temperature, the scrap steel is made of ordinary carbon steel, the thickness 2 to 4mm, and the block size is 1 / 5 to 1 / 4 of the diameter of the ladle. When tapping, ferromanganese (commodity material) is poured into the tapping trough with the flow, the flushing amount is 0.50-0.6%, and the particle size of ferromanganese is 2-4mm. [Mn-Si] value is controlled at -1.25~-1.35.

[0015] Among them: ferromanganese is medium carbon ferromanganese FeMn78C2.0, the composition is: 75.0-~82.0%Mn, 2%C, 1.5%Si, 0.2...

Embodiment 1

[0019] By adopting the invention to manufacture diesel engine flywheel castings, the pearlite content of the casting structure reaches 88%, and the performance indexes reach: tensile strength σb: 259-266Mpa, hardness HB: 185-200.

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PUM

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Abstract

The invention provides a preparation method for a high strength gray cast iron material. The preparation method comprises the following steps 1) batching; 2) cutting-in of waste steel and ferromanganese before a furnace; and 3) inoculation. According to the invention, inoculation effects are improved by controlling the value of SiC in molten iron and the adjustment value [Mn-Si] of cutting-in ferromanganese in a ladle before the furnace and increasing the degree of supercooling of cutting-in waste steel in the ladle before the furnace, and a mixed nucleating agent composed of 50% of ferrosilicon and 50% of a silicon barium alloy is employed for launder cutting-in inoculation; when carbon equivalent is 3.9 to 4.1% and alloying does not occur, the high-strength HT250 cast iron material can be stably prepared, and the material reaches the following performance indexes tensile strength Sigma[b] is 260 to 275 Mpa, hardness HB is 185 to 220, and pearlite content is greater than 85%.

Description

technical field [0001] The invention relates to the field of cast iron material processing, in particular to a technique for controlling the Si / C value of molten iron, [Mn-Si] difference, flushing scrap steel and ferromanganese in the molten iron ladle in front of the furnace, and adopting silicon barium and ferrosilicon mixed inoculant inoculation technology, A method for preparing HT250 high-strength gray cast iron material. Background technique [0002] High-strength HT250 cast iron has high strength, good wear resistance and vibration damping performance. Therefore, this material is widely used in the manufacture of box-like structural parts such as engine blocks, cylinder heads, and machine tools. [0003] At present, when preparing HT250 high-strength cast iron materials, in order to stabilize the material properties, copper and chromium alloy elements are generally added singly or simultaneously. However, there is a problem of low performance stability when preparing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/00C22C33/08
Inventor 荆泽平傅明喜张军中范萃常荆钰琦
Owner 丹阳市锦雄机械制造有限公司