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Spheroidal graphite cast iron mould cavity inoculation block and its production technology

A technology of nodular cast iron and technology, which is applied in the field of nodular cast iron inoculation block and its production technology, which can solve the problems of high density, uneven inoculation, non-inoculation, etc., and achieve the effect of reducing contact reaction time and preventing nodularization decline

Inactive Publication Date: 2005-02-16
HUBEI UNIV OF AUTOMOTIVE TECH
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0007] In order to solve the problems of high melting point, high density, uneven inoculation or non-inoculation in the existing inoculated blocks, the present invention proposes a uniformly dissolved inoculated block for the production of as-cast ferritic ductile iron and its manufacturing method

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  • Spheroidal graphite cast iron mould cavity inoculation block and its production technology
  • Spheroidal graphite cast iron mould cavity inoculation block and its production technology

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Embodiment Construction

[0011] The inoculum block of the ductile iron mold of the present invention, the main raw material is ferrosilicon, and rare earth and low melting point elements are added at the same time, wherein the weight percentage of each component is: Si accounts for 55-70%; RE accounts for 0.5-5%; low melting point elements 2 to 10%; the rest is iron. Since the main raw material of the commonly used inoculant is ferrosilicon, its melting point is 1310-1330°C, and the pouring temperature of molten iron in industrial production is generally 1330-1380°C, so the high melting point of ferrosilicon is not conducive to the melting of ferrosilicon , thereby affecting the breeding effect. Lowering the melting point of ferrosilicon alloy is an important measure to ensure uniform inoculation. On the basis of ferrosilicon, adding rare earth and low-melting point elements to the inoculant can lower the melting point of the ferrosilicon alloy, which is beneficial to the melting of the inoculant. Th...

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Abstract

An in-mould inoculating block for nodular graphite cast iron contains Si (55-70 wt.%), RE (0.5-5), low-smelting-point element (2-10) and iron (the rest), and is prepared through proportioning the ferrosilicon and rare-earth elements and low-smelting-point elements, smelting at 1600-1650 deg.c in a MF induction furnace, preparing wet clay-sand mould, fast casting with pearlite for stopping slags, waiting inoculating block to cool to 300-500 deg.C, demoulding, clearing off inoculating block, and blasting sand of the surface. Its advantages are low smelting point, low density and uniform inoculation.

Description

technical field [0001] The invention belongs to metal materials and techniques, and relates to an inoculum block in a ductile iron mold and a production technique thereof. Background technique [0002] The importance of inoculation treatment technology in cast iron production has long been recognized by people. It has become an important link in the production of high-quality iron castings, and it is also an effective measure to produce thin-walled, complex, high-strength cast iron and improve the processing performance of castings. The effect of the inoculant is time-sensitive, that is, the inoculation effect weakens with the extension of time. Therefore, the closer the time when the inoculant is added to the molten iron is closer to the solidification time of the molten iron, the better the effect. The commonly used inoculation technology is inoculation with flow and intratype gestation. In-mold inoculation belongs to instantaneous inoculation, and is widely used because ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D27/20C21C1/00C22C33/08
Inventor 曾大新张元好何汉军赖俊传陈勉己
Owner HUBEI UNIV OF AUTOMOTIVE TECH
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