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Spheroidizing agent and preparation method and application thereof in spheroidal graphite cast iron smelting

A technology of nodular cast iron and nodularizers, which is applied in the field of metallurgy to achieve the effects of reducing the possibility of distortion, high melting point, and improving roundness

Inactive Publication Date: 2016-03-16
宁波康发铸造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the conventional ductile iron casting process, usually only one nodulizer is added to spheroidize it, but one nodulizer always has many defects due to the limitation of quality and composition

Method used

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  • Spheroidizing agent and preparation method and application thereof in spheroidal graphite cast iron smelting

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The composition and mass percentage of the nodulizer are: Si: 43%, Mg: 7.6%, Y: 2.4%, Ce: 0.35%, Sc: 0.2%, Mn: 0.4%, Ca: 3.5%, Al: 0.18 %, nano-SiC with a particle size of 18-22nm: 11%, and the rest is Fe and unavoidable trace elements. The spheroidizing agent is broken into ultrafine powder with a particle size of 30-50 μm by fusion method.

Embodiment 2

[0027] The composition and mass percentage of the nodulizer are: Si: 42%, Mg: 7.8%, Y: 2.2%, Ce: 0.4%, Sc: 0.15%, Mn: 0.5%, Ca: 3.2%, Al: 0.25 %, nano-SiC with a particle size of 18-22nm: 10%, and the rest is Fe and unavoidable trace elements. The spheroidizing agent is broken into ultrafine powder with a particle size of 30-50 μm by fusion method.

Embodiment 3

[0029] The composition and mass percentage of the nodulizer are: Si: 44%, Mg: 7.5%, Y: 2.5%, Ce: 0.3%, Sc: 0.25%, Mn: 0.3%, Ca: 3.8%, Al: 0.15 %, nano-SiC with a particle size of 18-22nm: 12%, and the rest is Fe and unavoidable trace elements. The spheroidizing agent is broken into ultrafine powder with a particle size of 30-50 μm by fusion method.

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Abstract

The invention relates to a spheroidizing agent and a preparation method and application of the nucleating agent in spheroidal graphite cast iron smelting, and belongs to the technical field of metallurgy. The spheroidizing agent is composed of 41%-44% of Si, 7.5%-8% of Mg, 2.0%-2.5% of Y, 0.3%-0.5% of Ce, 0.1%-0.3% of Sc, 0.2%-0.6% of Mn, 3.0%-4.0% of Ca, 0.1%-0.3% of Al, 8%-15% of nano SiC with the grain size being 15-25 nm, and the balance Fe. A melting-mixing method is adopted and the spheroidizing agent is crushed to ultrafine powder with the grain size being 20-60 [mu]m. The invention further discloses the preparation method and application of the spheroidizing agent in spheroidal graphite cast iron smelting. Spheroidal graphite cast iron is obtained through spheroidizing twice by means of the spheroidizing agent, specifically, a first nucleating agent layer is placed on the side of the spheroidizing agent of a spheroidizing tundish and coated with a first spherical spheroidizing agent; the first spherical spheroidizing agent is coated with a first pig iron sheet layer; a second nucleating agent layer is overlaid on the first pig iron sheet layer, then a second spherical spheroidizing agent layer, a second pig iron sheet layer and a third nucleating agent layer are sequentially overlaid on the second nucleating agent layer, and spheroidizing and inoculation treatments are conducted by pouring in iron liquid. Obtained spheroidal graphite cast iron castings are high in strength, toughness and size stability.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a nodulizer, a preparation method thereof and an application of the inoculant in smelting nodular cast iron. Background technique [0002] The comprehensive performance of ductile iron is close to that of steel. Based on its excellent performance, it has been successfully used to cast some parts with complex stress, high strength, toughness and wear resistance. With the development of industrial technology, the requirements for the mechanical properties of ductile iron are getting higher and higher. The main ways to improve the mechanical properties of ductile iron materials are as follows: changing the material of cast iron; spheroidizing treatment; inoculation treatment; heat treatment; alloying. Among them, in the production of nodular cast iron, according to the production conditions and the technical requirements of the production of castings, the rational se...

Claims

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Application Information

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IPC IPC(8): C22C33/08C21C1/10
CPCC22C33/08C21C1/10
Inventor 俞光杰刘锐李建国
Owner 宁波康发铸造有限公司
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