Smelting method of high-toughness and high-strength casting-state ductile cast iron

A technology of ductile iron and high toughness, applied in the field of casting, can solve the problems of low mechanical properties of as-cast ductile iron, and achieve the effects of improved mechanical properties, low production cost and simple operation

Active Publication Date: 2018-12-25
SHANXI HUAXIANG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The invention aims to solve the problem of low mechanical

Method used

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  • Smelting method of high-toughness and high-strength casting-state ductile cast iron

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0046] Example 1:

[0047] A total of 800kg of molten iron is melted and 800kg is spheroidized;

[0048] Charge ratio: 240kg of pig iron, 280kg of scrap steel, 280kg of recharge material, 10kg of recarburizer (the recarburizer is placed in the middle and lower part of the intermediate frequency furnace), and the discharge temperature is controlled at 1535℃±15℃.

[0049] Spheroidizing treatment: spheroidizing agent 9.6kg inoculant: 5kg covering agent: 8kg secondary inoculant: 4.5kg three inoculation: (following inoculation) 0.88kg copper: 1.7kg tin: 0.15kg.

[0050] Before spheroidizing, preheat the spheroidizing ladle and pouring ladle to 600℃-800℃ (dark red or red),

[0051] Add the spheroidizing agent, inoculant, and covering agent into the spheroidizing bag in sequence, and ramming tightly. Put copper and tin into the spheroidizing bag. Put the molten iron into the spheroidizing ladle and cover the lid of the spheroidizing ladle. After the reaction is stable, the molten iron is pou...

Example Embodiment

[0056] Example 2:

[0057] Totally melt 1000kg of molten iron and spheroidize 1000kg;

[0058] Charge ratio: 250kg of pig iron, 350kg of scrap steel, 400kg of recharge material, 13kg of recarburizer (the recarburizer is placed in the middle and lower part of the intermediate frequency furnace), the furnace temperature is controlled at 1545℃±15℃.

[0059] Spheroidizing treatment: spheroidizing agent 12.5kg inoculant: 6kg covering agent: 10kg secondary inoculant: 5.5kg three inoculation: (following inoculation) 1.2kg copper: 2kg tin: 0.17kg.

[0060] Before spheroidizing, preheat the spheroidizing ladle and pouring ladle to 600℃-800℃ (dark red or red),

[0061] Add the spheroidizing agent, inoculant, and covering agent into the spheroidizing bag in sequence, and ramming tightly. Put copper and tin into the spheroidizing bag. Put the molten iron into the spheroidizing ladle and cover the lid of the spheroidizing ladle. After the reaction is stable, the molten iron is poured into the pour...

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Abstract

The invention relates to a smelting method of high-toughness and high-strength casting-state ductile cast iron. The smelting method comprises the steps of 1, material selection, in which pig iron, scrap steel and a melting-back material are selected as raw materials; 2, material preparation, in which 20-40% of pig iron, 30-40% of scrap steel and 20-50% of melting-back material are selected according to percent by mass; 3, smelting, in which the raw materials prepared in the step 2 are added into a medium-frequency smelting furnace, the temperature is raised, the raw materials are molten, a carburant is added to the bottom of the furnace during smelting, and the raw materials are molten to a required furnace outlet temperature; 4, nodulization and casting, in which a nodulization pack and acasting pack are pre-heated to 600-800 DEG C before nodulization, a nodulizing agent, an inoculation agent and a coverage agent are sequentially placed in the nodulization pack placement pit, and inoculation for three times is performed; and 5, box outlet. The smelting method is simple to operate; and by adding the scrap steel and the melting-back material in a large proportion, the production cost is low, and the mechanical property is improved by a reasonable proportion.

Description

technical field [0001] The invention relates to the field of casting, in particular to a melting method of as-cast high-toughness and high-strength nodular cast iron. Background technique [0002] In production practice, nodular cast iron is widely used, standard nodular cast iron QT600-3 tensile strength σb≥600MPa, elongation δ≥3%, because some bridge products require higher strength and elongation for castings, this research has been done QT650-10 ductile iron. Chinese patent CN1554793A discloses a ductile iron material with high yield strength as cast, with tensile strength σb≥620MPa and elongation δ≥6%. Conventional production, requiring heat treatment, increased costs and longer lead times. Contents of the invention [0003] The invention aims to solve the problem of low mechanical properties of as-cast nodular cast iron produced in the prior art. Provided is a method for smelting ductile iron with high toughness and high strength in as-cast state. [0004] The te...

Claims

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Application Information

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IPC IPC(8): C22C33/08C22C37/04C22C37/10
CPCC22C33/006C22C33/08C22C37/04C22C37/10
Inventor 王李虎王渊张杰范永富陈旗张宇飞郭凌冰
Owner SHANXI HUAXIANG GRP CO LTD
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