Inoculating agent used for thin-walled ferrite nodular cast iron and preparing method of inoculating agent

Abstract

The invention discloses an inoculating agent for thin-walled ferrite nodular cast iron. With the total weight of the inoculating agent for the thin-walled ferrite nodular cast iron being 100%, the inoculating agent for the thin-walled ferrite nodular cast iron comprises, by weight, 68-70% of Si, 2-4% of RE, 1-2% of Sr, 0.3-0.8% of Bi, 1.0-3.0% of Ca, 2.0-4.0% of Ba, 0.3-0.5% of Al and the balanceFe. The obtained thin-walled ferrite nodular cast iron has the functions of promoting graphite nucleation, reducing chilling tendency, increasing the number of the nodular cast iron and improving theintegrity of the nodular cast iron, the ferrite content can be remarkably improved in a casting state, and the elongation and strength of the nodular cast iron are improved.

Description

technical field

[0001] The invention relates to the field of ductile iron casting, in particular to an inoculant for thin-walled ferrite ductile iron and a preparation method thereof. Background technique

[0002] The inoculant is a kind of inoculant that can promote graphitization, reduce the tendency of whitening, improve the morphology and distribution of graphite, increase the number of eutectic groups, and refine the matrix structure. It has a good effect in a short time after inoculation treatment. In the production of ductile iron, inoculation is an essential process due to the relatively large tendency of supercooling. The main function of using inoculants for inoculation treatment is to increase the number of graphite nodules in ductile iron, improve their roundness, refine graphite nodules, prevent spheroidization recession, reduce the tendency of white mouth, and prevent the formation of free particles between eutectic clusters. Cementite and segregation. The mo...

Examples

preparation example Construction

[0016] The present invention also provides a method for preparing the inoculant for thin-walled ferritic nodular cast iron described above, the preparation method comprising: (1) according to the chemical composition and mass percentage of the inoculant for thin-walled ferritic nodular cast iron Weighing raw materials for blending; (2) smelting the blended raw materials; (3) pouring, cooling, crushing and granulating the smelted product. 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.

[0017] Through the above technical scheme, the inoculant for thin-walled ferritic nodular cast iron of the present invention has the following advantages: (1) suppress pearlite and promote the formation of ferrite: use aluminum to increase the ferrite content, add an appropriate amount of ...

Embodiment 1

[0024] A method for preparing an inoculant for thin-walled ferritic ductile iron, characterized in that the preparation method comprises:

[0025] (1) According to the chemical composition and mass percentage of the inoculant for thin-walled ferritic nodular cast iron, the raw materials are weighed for deployment: the total weight of the inoculant for thin-walled ferritic nodular cast iron is 100%, and the thin-walled ferritic nodular cast iron The chemical composition of the inoculant for cast iron includes: 68.6% Si, 2.6% RE, 1.2% Sr, 0.4% Bi, 1.6% Ca, 2.6% Ba, 0.32% Al, and the balance is Fe;

[0026] (2) Smelting the prepared raw materials at 1490°C;

[0027] (3) Cast the smelt at 1510° C., cool, crush and granulate.

Embodiment 2

[0029] A method for preparing an inoculant for thin-walled ferritic ductile iron, characterized in that the preparation method comprises:

[0030] (1) According to the chemical composition and mass percentage of the inoculant for thin-walled ferritic nodular cast iron, the raw materials are weighed for deployment: the total weight of the inoculant for thin-walled ferritic nodular cast iron is 100%, and the thin-walled ferritic nodular cast iron The chemical composition of the inoculant for cast iron includes: 69.6% Si, 3.4% RE, 1.8% Sr, 0.6% Bi, 2.6% Ca, 3.6% Ba, 0.46% Al, and the balance is Fe;

[0031] (2) Smelting the prepared raw materials at 1520°C;

[0032] (3) Cast the smelt at 1530° C., cool, crush and granulate.

technical field

[0001] The invention relates to the field of ductile iron casting, in particular to an inoculant for thin-walled ferrite ductile iron and a preparation method thereof. Background technique

[0002] The inoculant is a kind of inoculant that can promote graphitization, reduce the tendency of whitening, improve the morphology and distribution of graphite, increase the number of eutectic groups, and refine the matrix structure. It has a good effect in a short time after inoculation treatment. In the production of ductile iron, inoculation is an essential process due to the relatively large tendency of supercooling. The main function of using inoculants for inoculation treatment is to increase the number of graphite nodules in ductile iron, improve their roundness, refine graphite nodules, prevent spheroidization recession, reduce the tendency of white mouth, and prevent the formation of free particles between eutectic clusters. Cementite and segregation. The mo...

Examples

preparation example Construction

[0016] The present invention also provides a method for preparing the inoculant for thin-walled ferritic nodular cast iron described above, the preparation method comprising: (1) according to the chemical composition and mass percentage of the inoculant for thin-walled ferritic nodular cast iron Weighing raw materials for blending; (2) smelting the blended raw materials; (3) pouring, cooling, crushing and granulating the smelted product. 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.

[0017] Through the above technical scheme, the inoculant for thin-walled ferritic nodular cast iron of the present invention has the following advantages: (1) suppress pearlite and promote the formation of ferrite: use aluminum to increase the ferrite content, add an appropriate amount of ...

Embodiment 1

[0024] A method for preparing an inoculant for thin-walled ferritic ductile iron, characterized in that the preparation method comprises:

[0025] (1) According to the chemical composition and mass percentage of the inoculant for thin-walled ferritic nodular cast iron, the raw materials are weighed for deployment: the total weight of the inoculant for thin-walled ferritic nodular cast iron is 100%, and the thin-walled ferritic nodular cast iron The chemical composition of the inoculant for cast iron includes: 68.6% Si, 2.6% RE, 1.2% Sr, 0.4% Bi, 1.6% Ca, 2.6% Ba, 0.32% Al, and the balance is Fe;

[0026] (2) Smelting the prepared raw materials at 1490°C;

[0027] (3) Cast the smelt at 1510° C., cool, crush and granulate.

Embodiment 2

[0029] A method for preparing an inoculant for thin-walled ferritic ductile iron, characterized in that the preparation method comprises:

[0030] (1) According to the chemical composition and mass percentage of the inoculant for thin-walled ferritic nodular cast iron, the raw materials are weighed for deployment: the total weight of the inoculant for thin-walled ferritic nodular cast iron is 100%, and the thin-walled ferritic nodular cast iron The chemical composition of the inoculant for cast iron includes: 69.6% Si, 3.4% RE, 1.8% Sr, 0.6% Bi, 2.6% Ca, 3.6% Ba, 0.46% Al, and the balance is Fe;

[0031] (2) Smelting the prepared raw materials at 1520°C;

[0032] (3) Cast the smelt at 1530° C., cool, crush and granulate.