Creeping agent for pearlite type vermicular cast iron member

A technology of vermicular graphite cast iron and vermicularizing agent, which is applied in the field of vermicularizing agent for cast iron, and can solve the problems of insufficiency and ferritization.

Inactive Publication Date: 2009-05-06
上海市机械制造工艺研究所有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Second, experiments have shown that due to the concentration segregation of alloying elements, it also leads to the tendency of ferriteization in the eutectic cluster
Therefore, the matrix of vermicular graphite cast iron is usually mainly ferrite, which cannot meet the needs of some high-demand parts.

Method used

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  • Creeping agent for pearlite type vermicular cast iron member
  • Creeping agent for pearlite type vermicular cast iron member
  • Creeping agent for pearlite type vermicular cast iron member

Examples

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Embodiment Construction

[0016] The vermicular agent in the following examples is specially used to produce high-power diesel engine piston ring-like vermicular graphite cast iron, which requires high wear resistance, high corrosion resistance, and relatively high mechanical properties.

[0017] In the embodiment, the vermicular agent is formed by smelting rare earth ferrosilicon alloy, metal magnesium ingot, ferrosilicon, ferrophosphorus, aluminum ingot, electrolytic copper, and steel scrap.

[0018] The composition of molten iron before vermicular agent treatment is as follows:

[0019]

[0020] The following table is the percentage by weight of each component of the vermicular agent of each embodiment:

[0021] Example RE% Mg% Si% A1???％ P％ Cu% Fe 1 10 8 40 1 10 15 margin 2 15 4 50 2 12 20 margin 3 20 2 45 2 10 30 margin 4 15 6 35 1 10 20 margin 5 30 7 45 3 15 15 margin

[0022] The particle size of the vermic...

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Abstract

The invention discloses a vermiculizer for pearlite type vermicular cast iron. The vermiculizer comprises the following components in weight percentage: 10 to 30 percent of rare earth, 2 to 8 percent of magnesium, 35 to 50 percent of silicon, 1 to 3 percent of aluminum, 10 to 15 percent of phosphorus, 10 to 30 percent of copper, and the balance being iron. The adoption of phosphorus and iron aims to form evenly distributed iron phosphide eutectic in the vermicular cast iron, which improves the wearing resistance of the vermicular cast iron; and the addition of electrolytic copper aims to increase the pearlite content of the vermicular cast iron. By using the vermiculizer, the high strength and high hardness vermicular cast iron of which the vermicular graphite percentage is more than 80 percent and the basal body is the pearlite can be effectively produced. The vermiculizer has the advantages of simple use, obvious effect and stable vermicular graphite.

Description

technical field [0001] The invention relates to a vermicular agent for cast iron. Background technique [0002] The graphite form of vermicular graphite cast iron is between flake and spherical, and it is worm-like. The process performance and metallographic structure of vermicular graphite cast iron are also between gray cast iron and nodular cast iron, but the mechanical properties are close to nodular cast iron. The outer edge of worm-like graphite is wavy and curved, and the bite with the metal substrate is better than that of gray cast iron. Graphite is difficult to peel off, which is beneficial to anti-friction, oil storage and heat conduction. Therefore, vermicular graphite cast iron has better anti-friction than gray cast iron Performance, strength and toughness are slightly higher than ordinary gray cast iron; graphite in vermicular graphite cast iron is worm-like, compared with spherical graphite in ductile graphite iron, the contact surface is wider, so the wear r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/08
Inventor 哈胜男顾楚鑫陈德华任颂赞李晶静
Owner 上海市机械制造工艺研究所有限公司
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