Nucleating agent for high-grade ductile iron and preparation method of nucleating agent

A high-grade, inoculant technology, applied in the field of ductile cast iron production, can solve the problems of restricting the application of ductile cast iron, increasing hardness, and cutting processing difficulties, and achieve excellent lattice matching, increasing elongation, and improving machinability. Effect

Inactive Publication Date: 2017-11-28
ANHUI POLYTECHNIC UNIV MECHANICAL & ELECTRICAL COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the current market, the tensile strength is usually increased to 700Mpa by increasing the pearlite content, and the hardness is also increased accordingly, even reaching HB ≥ 255, resulting in difficulties in cutting and limiting the application of nodular cast iron. Therefore, it is necessary to develop a A new type of inoculant to facilitate the machining of nodular cast iron

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0013] The present invention also provides a method for preparing the above-mentioned high-grade nodular iron inoculant, the preparation method comprising: (1) weighing and preparing raw materials according to the chemical composition and mass percentage of the high-grade nodular iron inoculant; (2) Melting the prepared raw materials; (3) Casting the smelted material, cooling, crushing and granulating. For example, the chemical composition and mass percentage here can be obtained by formulating and calculating according to the content of each element in the raw materials used, as long as those skilled in the art can understand the method can be used here.

[0014] Through the above technical scheme, the present invention has determined the element components and the content of each element of the inoculant for high-grade ductile iron, wherein Si and Ba elements maintain the quality of the graphite crystal core with good stability at high temperatures, and at the same time The ...

Embodiment 1

[0023] A preparation method for an inoculant for high-grade ductile iron, the preparation method comprising:

[0024] (1) According to the chemical composition and mass percentage of the high-grade nodular iron inoculant, the raw materials are weighed and prepared. Based on the total weight of the high-grade nodular iron inoculant as 100%, the chemical composition of the high-grade nodular iron inoculant includes: 69% Si, 3.6% Ba, 1.6% Ca, 0.36 Sb, and the balance is Fe;

[0025] (2) Smelting the prepared raw materials at 1510°C;

[0026] (3) Cast the smelt at 1520° C., cool, crush and granulate.

Embodiment 2

[0028] A preparation method for an inoculant for high-grade ductile iron, the preparation method comprising:

[0029] (1) According to the chemical composition and mass percentage of the high-grade nodular iron inoculant, the raw materials are weighed and prepared. Based on the total weight of the high-grade nodular iron inoculant as 100%, the chemical composition of the high-grade nodular iron inoculant includes: 71% Si, 4.6% Ba, 2.6% Ca, 0.54% Sb, the balance being Fe;

[0030] (2) Smelting the prepared raw materials at 1520°C;

[0031] (3) Cast the smelt at 1530° C., cool, crush and granulate.

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PUM

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Abstract

The invention discloses a nucleating agent for high-grade ductile iron and a preparation method of the nucleating agent. The nucleating agent for the high-grade ductile iron comprises the chemical components of 68-72% of Si, 3-5% of Ba, 1-3% of Ca, 0.15-0.6% of Sb and the balance Fe with the total weight of the nucleating agent for the high-grade ductile iron being 100%. By means of the nucleating agent for the high-grade ductile iron, the strength of the ductile iron can be increased, the elongation rate is increased, the hardness of the ductile iron is lowered, the cutting machinability is improved, and requirements for production and application are met.

Description

technical field [0001] The invention relates to the field of production of ductile cast iron, in particular to an inoculant for high-grade ductile iron and a preparation method thereof. Background technique [0002] In actual production and application, ductile iron is commonly used with tensile strength ≥ 500Mpa, elongation ≥ 2%, HB: 210-255. Spheroidization grade 1-3, graphite 5-7, pearlite content ≥ 65%. However, in the current market, the tensile strength is usually increased to 700Mpa by increasing the pearlite content, and the hardness is also increased accordingly, even reaching HB ≥ 255, resulting in difficulties in cutting and limiting the application of nodular cast iron. Therefore, it is necessary to develop a A new type of inoculant to facilitate the cutting of ductile iron. Contents of the invention [0003] The object of the present invention is to provide a high-grade nodular iron inoculant and its preparation method, the high-grade nodular iron inoculant ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C1/10C22C33/08
CPCC21C1/105C22C33/08
Inventor 柴知章席世亨许本琪张月茹
Owner ANHUI POLYTECHNIC UNIV MECHANICAL & ELECTRICAL COLLEGE
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