Melting method of as-cast high-toughness and high-strength nodular cast iron

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

Active Publication Date: 2020-06-30
SHANXI HUAXIANG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention aims to solve the problem of low mechanical properties of as-cast nodular cast iron produced in the prior art

Method used

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  • Melting method of as-cast high-toughness and high-strength nodular cast iron

Examples

Experimental program
Comparison scheme
Effect test

example 1

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

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

[0049] Spheroidization treatment: 9.6kg nodulizer, inoculant: 5kg, covering agent: 8kg, secondary inoculant: 4.5kg, third inoculation: (inoculation with flow) 0.88kg, copper: 1.7kg, tin: 0.15kg.

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

[0051] Add the spheroidizing agent, inoculant, and covering agent into the spheroidizing bag in sequence, and beat tightly. Put copper and tin into the spheroidizing bag. Put the molten iron into the spheroidizing bag and cover the spheroidizing bag cover. After the reaction is stable, pour the molten iron into the pouring bag (teapot ba...

example 2

[0057] A total of 1000KG molten iron is melted and 1000kg is spheroidized

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

[0059] Spheroidization treatment: 12.5kg nodulizer, inoculant: 6kg, covering agent: 10kg, secondary inoculant: 5.5kg, third inoculation: (inoculation with flow) 1.2kg, copper: 2kg, tin: 0.17kg.

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

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

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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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Patent Type & Authority Patents(China)
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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