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Austempered ductile iron and preparation method and application thereof

A technology of austempered ductile iron and molten iron, which is applied in the field of austempered ductile iron and its preparation, can solve the problems of decreased strength of castings, long cooling time, poor hardenability, etc., and can improve elongation, mechanical properties, and yield high effect

Active Publication Date: 2019-10-01
天津昌昊实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, for Aube ductile iron castings with a wall thickness of 60-100mm and above, especially the core of the casting, the cooling time is long and the hardenability is poor, which makes the strength of the castings at this place prone to decline, making ordinary Aubeite balls The application of iron in thick and large mechanical parts is greatly restricted

Method used

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  • Austempered ductile iron and preparation method and application thereof
  • Austempered ductile iron and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0046] A kind of Aubic ductile iron, including the following elements by mass percentage: C 3.35%, Si 2.45%, Mn 0.21%, Ni 2.3%, Cu 0.69%, Mo 0.32%, Mg 0.05%, P≤0.02%, S≤ 0.02%, and the balance is Fe.

[0047] The preparation method comprises the following steps:

[0048] a. Raw material smelting:

[0049] Mix and melt pig iron, scrap steel, furnace charge, recarburizer, silicon carbide, and silicon at a melting temperature of 1500°C to obtain molten iron, then let it stand for 1 minute, remove slag, and wait for the temperature of molten iron to drop to 1470°C; among them, The weight ratio of pig iron:scrap:return charge is 10:70:20;

[0050] b. Spheroidization treatment and inoculation treatment:

[0051] b1. Spheroidization treatment and primary inoculation treatment: add a primary inoculant with a total weight of 0.35% of the molten iron in the bag, the particle size of the primary inoculant is 3mm, add a nodulizer with a total weight of 1.2% of the molten iron, and the ...

Embodiment 2

[0059] An Aubic ductile iron, including the following elements by mass percentage: C 3.4%, Si 2.4%, Mn 0.22%, Ni 2.1%, Cu 0.75%, Mo 0.3%, Mg 0.06%, P≤0.02%, S≤ 0.02%, and the balance is Fe.

[0060] The preparation method comprises the following steps:

[0061] a. Raw material smelting:

[0062] Mix and melt pig iron, scrap steel, furnace charge, recarburizer, silicon carbide, and silicon at a melting temperature of 1520°C to obtain molten iron, then let it stand for 1 minute, remove slag, and wait for the temperature of the molten iron to drop to 1480°C; among them, The weight ratio of pig iron:scrap:return charge is 15:60:25;

[0063] b. Spheroidization treatment and inoculation treatment:

[0064] b1. Spheroidization treatment and primary inoculation treatment: add a primary inoculant with a total weight of 0.4% of molten iron in the bag, the particle size of the primary inoculant is 5mm, add a nodulizer with a total weight of 1.1% of molten iron, and a particle size of ...

Embodiment 3

[0072] An Aubic ductile iron, including the following elements by mass percentage: C 3.44%, Si 2.37%, Mn 0.23%, Ni2%, Cu 0.8%, Mo 0.25%, Mg 0.07%, P≤0.02%, S≤0.02% , The balance is Fe.

[0073] The preparation method comprises the following steps:

[0074] a. Raw material smelting:

[0075] Mix and melt pig iron, scrap steel, furnace charge, recarburizer, silicon carbide, and silicon at a melting temperature of 1550°C to obtain molten iron, then let it stand for 1 minute, remove slag, and wait for the temperature of molten iron to drop to 1490°C; among them, The weight ratio of pig iron:scrap:return charge is 20:50:30;

[0076] b. Spheroidization treatment and inoculation treatment:

[0077] b1. Spheroidization treatment and primary inoculation treatment: add a primary inoculant of 0.45% of the total weight of the molten iron in the bag, the particle size of the primary inoculant is 8mm, add a nodulizer of 1% of the total weight of the molten iron, and the particle size of ...

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Abstract

The invention discloses austempered ductile iron and a preparation method and application thereof. The austempered ductile iron comprises, by mass percent, 3.35%-3.44% of C, 2.37%-2.45% of Si, 0.21%-0.23% of Mn, 1.02%-1.26% of Ni, 0.69%-0.8% of Cu, 0.17%-0.32% of Mo, 0.05%-0.07% of Mg, not larger than 0.02% of P, not larger than 0.02% of S and the balance Fe. The preparation method comprises the steps that a, pig iron, waste steel, returns, a carburant, silicon carbide and silicon are mixed and molten, the melting temperature ranges from 1500 DEG C to 1550 DEG C, iron liquid is obtained, and standing and slag removal are carried out till the temperature of the iron liquid is reduced to 1480 + / -10 DEG C; b, a nucleating agent is added into a ladle for the first time, a spheroidizing agent and a covering agent are added, compacting is carried out, then the iron liquid is poured, slag is removed, ladle-to-ladle late inoculation is carried out, a nucleating agent is added for the second time, slag is removed, a casting is obtained through casting, and during casting, a nucleating agent is added for the third time along with the flow; and c, isothermal quenching treatment is carried out. For thick and large parts with the wall thickness being 60-100 mm or above, the austempered ductile iron has excellent strength and malleability at the same time and is suitable for machining and manufacturing parts of mining mechanical equipment.

Description

technical field [0001] The invention relates to the technical field of Aubician ductile iron, in particular to Aubician ductile iron and a preparation method and application thereof. Background technique [0002] Aobei ductile iron is characterized by high strength, high wear resistance, fatigue resistance, and good comprehensive performance. It replaces the original alloy ductile iron, cast steel, forged steel, and welded steel. It is widely used in automobiles, trains, and building materials. , chemical industry, metallurgy, agricultural machinery, grain and oil machinery, construction machinery and other industries, can prolong the service life of equipment, reduce the weight of the whole machine, and greatly reduce the cost. [0003] However, for Aube ductile iron castings with a wall thickness of 60-100mm and above, especially the core of the casting, the cooling time is long and the hardenability is poor, which makes the strength of the castings at this place prone to ...

Claims

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Application Information

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IPC IPC(8): C21C1/10C22C33/10C22C37/04C22C37/10
CPCC21C1/10C22C33/10C22C37/04C22C37/10Y02P10/20
Inventor 孙鸣李雷唐广铁王学林王立永余振兴
Owner 天津昌昊实业有限公司
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