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Compound rare earth nucleating agent for nodular cast iron and preparation method of compound rare earth nucleating agent

A technology for compounding rare earth and ductile iron, applied in the field of inoculant production, can solve problems such as inability to meet, low tensile strength, etc., and achieve the effects of reducing white mouth tendency, improving tensile strength, and increasing pearlite content

Inactive Publication Date: 2016-06-01
TONGLING ANDONG CAST STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Castings obtained from molten iron inoculated with other currently commonly used ferrosilicon inoculants have low tensile strength, which cannot meet the requirements of some machine castings that require high toughness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1 A composite rare earth inoculant for ductile iron and a preparation method thereof, consisting of the following components in percentage by weight: 2.5% copper, 12% tin, 8.0% antimony, 1.8% manganese, 3.0% aluminum, 3.5% magnesium, Calcium 5.5%, cerium 4.4%, lanthanum 0.85%, rhenium 2.2%, strontium 0.75%, and the balance is iron.

[0016] A composite rare earth inoculant for ductile iron and a preparation method thereof, comprising the following steps:

[0017] (1) taking the alloy raw material of said weight percentage, and pulverizing the alloy raw material taken;

[0018] (2) Mix the pulverized alloy raw materials evenly and put them into a vacuum electric furnace, replace the air in the furnace with argon, heat up to 1350°C-1480°C for 8-15 minutes, and keep stirring during the melting process until the raw materials are evenly mixed;

[0019] (3) After the raw materials are fully melted and mixed, they are vacuum cooled to form granules, and the granules ...

Embodiment 2

[0022] Example 2 A composite rare earth inoculant for ductile iron and a preparation method thereof, consisting of the following components in percentage by weight: 3.2% copper, 18% tin, 15% antimony, 3.5% manganese, 4.0% aluminum, 4.2% magnesium, Calcium 6.2%, cerium 5.2%, lanthanum 1.2%, rhenium 3.0%, strontium 1.25%, and the balance is iron.

[0023] A composite rare earth inoculant for ductile iron and a preparation method thereof, comprising the following steps:

[0024] (1) taking the alloy raw material of said weight percentage, and pulverizing the alloy raw material taken;

[0025] (2) Mix the pulverized alloy raw materials evenly and put them into a vacuum electric furnace, replace the air in the furnace with argon, heat up to 1350°C-1480°C for 8-15 minutes, and keep stirring during the melting process until the raw materials are evenly mixed;

[0026] (3) After the raw materials are fully melted and mixed, they are vacuum cooled to form granules, and the granules ar...

Embodiment 3

[0029] Example 3 A composite rare earth inoculant for ductile iron and a preparation method thereof, consisting of the following components in weight percent: 2.8% copper, 15% tin, 12% antimony, 2.6% manganese, 3.5% aluminum, 3.8% magnesium, Calcium 6.0%, cerium 4.8%, lanthanum 0.98%, rhenium 2.6%, strontium 0.95%, and the balance is iron.

[0030] A composite rare earth inoculant for ductile iron and a preparation method thereof, comprising the following steps:

[0031] (1) taking the alloy raw material of said weight percentage, and pulverizing the alloy raw material taken;

[0032] (2) Mix the pulverized alloy raw materials evenly and put them into a vacuum electric furnace, replace the air in the furnace with argon, heat up to 1350°C-1480°C for 8-15 minutes, and keep stirring during the melting process until the raw materials are evenly mixed;

[0033] (3) After the raw materials are fully melted and mixed, they are vacuum cooled to form granules, and the granules are cru...

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Abstract

The invention discloses a compound rare earth nucleating agent for nodular cast iron and a preparation method of the compound rare earth nucleating agent. The compound rare earth nucleating agent is prepared from, by weight percent, 2.5% to 3.2% of copper, 12% to 18% of tin, 8.0% to 15% of antimony, 1.8% to 3.5% of manganese, 3.0% to 4.0% of aluminum, 3.5% to 4.2% of magnesium, 5.5% to 6.2% of calcium, 4.4% to 5.2% of cerium, 0.85% to 1.2% of lanthanum, 2.2% to 3.0% of rhenium, 0.75% to 1.25% of strontium and the balance iron. Compared with the prior art, the compound rare earth nucleating agent has the beneficial effects that the compound rare earth nucleating agent can promote nucleation of graphite, enhance the nucleating effect and remarkably reduce the chilling tendency of the cast iron, and the graphite refining performance is better; and the content of pearlite in the nucleated nodular cast iron is remarkably increased, and therefore the tensile strength of the nodular cast iron is improved.

Description

technical field [0001] The invention relates to the technical field of inoculant production, in particular to a composite rare earth inoculant for ductile iron and a preparation method thereof. Background technique [0002] With the development of industrial technology, the requirements for the mechanical properties of cast iron are getting higher and higher. The main ways to improve the mechanical properties of cast iron materials are as follows: changing the ratio of carbon to silicon in cast iron; inoculation treatment; heat treatment; alloying. Among them, inoculation treatment is a relatively simple, economical and effective method. Inoculation treatment requires a suitable inoculant, which plays an important role in the quality and cost of iron castings, especially in the development of high-grade iron castings. The role of inoculation treatment is to change the solidification conditions of cast iron eutectic crystals to achieve the purpose of eliminating white spots...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/08C21C1/10
CPCC22C33/08C21C1/105
Inventor 梅百荣
Owner TONGLING ANDONG CAST STEEL
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