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Production method of gray cast iron

A production method, the technology of gray cast iron, which is applied in the field of cast iron processing, can solve the problems of easy cracking, failure, and low service life.

Active Publication Date: 2021-09-10
ZHUMADIAN ZHONGJI HUAJUN CASTING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a production method of gray cast iron to solve the problems in the prior art that the castings processed with gray cast iron are easy to crack and fail, and the service life is low

Method used

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  • Production method of gray cast iron
  • Production method of gray cast iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] According to the mass percentage content, 50% of steel scrap, 15% of iron filings, 33.4% of returned charge, and 1.6% of recarburizer were weighed.

[0079] Sequentially add steel scrap, iron filings, returned charge and recarburizer into the electric furnace to melt, and adjust the composition to obtain molten iron; wherein, in terms of mass percentage, C in the molten iron is 3.40-3.50%, Si is 1.10-1.30%, Mn 0.60-0.90%, P≤0.15%, S 0.06-0.12%, Cr 0.20-0.50%, and the rest are trace elements and Fe.

[0080] Both the molten iron treatment ladle and the pouring ladle are preheated to 800°C.

[0081] The temperature of the molten iron is raised to 1520° C., and then the molten iron is poured into the above-mentioned preheated molten iron treatment ladle.

[0082] Provide passivation wire, and passivate the molten iron in the molten iron treatment ladle; the diameter of the passivation wire is 13±0.8mm, and the amount of passivation wire added is 13m per ton of molten iron...

Embodiment 2

[0087] According to the mass percentage, weigh 40% of steel scrap, 23% of iron filings, 35% of returned charge, and 2.0% of recarburizer.

[0088] Sequentially add steel scrap, iron filings, returned charge and recarburizer into the electric furnace to melt, and adjust the composition to obtain molten iron; wherein, in terms of mass percentage, C in the molten iron is 3.40-3.50%, Si is 1.10-1.30%, Mn 0.60-0.90%, P≤0.15%, S 0.06-0.12%, Cr 0.20-0.50%, and the rest are trace elements and Fe.

[0089] Both the molten iron treatment ladle and the pouring ladle are preheated to 700°C.

[0090] The temperature of the molten iron is raised to 1540° C., and then the molten iron is poured into the above-mentioned preheated molten iron treatment ladle.

[0091] Provide passivation wire, and passivate the molten iron in the molten iron treatment ladle; the diameter of the passivation wire is 13±0.8mm, and the amount of passivation wire added is 13m per ton of molten iron.

[0092] Accor...

Embodiment 3

[0096] According to the mass percentage content, 40% of steel scrap, 18.4% of iron filings, 40% of returned charge, and 1.6% of recarburizer were weighed.

[0097] Sequentially add steel scrap, iron filings, returned charge and recarburizer into the electric furnace to melt, and adjust the composition to obtain molten iron; wherein, in terms of mass percentage, C in the molten iron is 3.40-3.50%, Si is 1.10-1.30%, Mn 0.60-0.90%, P≤0.15%, S 0.06-0.12%, Cr 0.20-0.50%, and the rest are trace elements and Fe.

[0098] Both the molten iron treatment ladle and the pouring ladle are preheated to 900°C.

[0099] The temperature of the molten iron is raised to 1530° C., and then the molten iron is poured into the above-mentioned preheated molten iron treatment ladle.

[0100] Provide passivation wire, and passivate the molten iron in the molten iron treatment ladle; the diameter of the passivation wire is 13±0.8mm, and the amount of passivation wire added is 13m per ton of molten iron...

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Abstract

The invention provides a production method of gray cast iron, comprising the following steps: weighing 40-50% of scrap steel, 20-25% of iron filings, 35-45% of returned charge, and 1.6-2.0% of recarburizer according to the mass percentage %; add iron filings, steel scrap, recarburizer and return materials to the electric furnace to melt in turn, and adjust the composition to obtain molten iron; provide a molten iron treatment ladle and a pouring ladle, and preheat the molten iron treatment ladle and the pouring ladle to Above 600°C; pour the molten iron into the preheated molten iron treatment ladle; provide passivation wire to passivate the molten iron in the molten iron treatment ladle; among them, in terms of mass percentage, the passivation wire Si is 45-48%, Ca is 2.0-2.5%, Mg is 0.7-0.9%, Ba is 5.8-6.2%, Re is 20-22%; the addition of passivation wire is 13m per ton of molten iron; The mass ratio of molten iron, weigh 75Si-Fe 0.40-0.60%, Sn 0.06-0.08%, and mix evenly to obtain a mixture; add the above mixture into the pouring ladle, and then pour the molten iron after the wire feeding passivation treatment Put it into the pouring ladle; pour it into shape, and get gray cast iron after molding.

Description

technical field [0001] The invention relates to the technical field of cast iron processing, in particular to a production method of gray cast iron. Background technique [0002] Gray cast iron refers to cast iron with flake graphite. Because the fracture is dark gray when broken, it is called gray cast iron. Its main components are iron, carbon, silicon, manganese, sulfur, and phosphorus. It is the most widely used cast iron. With its unique metallographic structure and performance characteristics, gray cast iron is widely used in automobiles, construction machinery, etc., especially in the application of automobile brakes. [0003] The structure of gray cast iron is composed of metal matrix plus flake graphite. However, in the gray cast iron structure, it is very easy to generate stress concentration and fatigue at the graphite tip, which leads to cracking and failure of castings processed with gray cast iron, which reduces the service life. Contents of the invention ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/10C21C1/08B22D1/00C22C37/06C22C37/10C22C28/00C22C27/06C22C22/00
CPCB22D1/00C21C1/08C22C22/00C22C27/06C22C28/00C22C33/10C22C37/06C22C37/10Y02P10/20
Inventor 汤森李建赵宇飞秦鹏鹏张象中陶磊田自祥
Owner ZHUMADIAN ZHONGJI HUAJUN CASTING
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