Preparation method for high-toughness nodular cast iron

A tough ball and cast iron technology, which is applied in the field of preparation of high-strength ductile cast iron, can solve problems such as complicated procedures, and achieve the effects of fewer procedures, high efficiency, and reduced spotlight and smoke

Active Publication Date: 2014-08-13
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the methods reported in these two places all need desulfurization treatment, and the process is relatively complicated.

Method used

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  • Preparation method for high-toughness nodular cast iron
  • Preparation method for high-toughness nodular cast iron

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Experimental program
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Effect test

Embodiment 1

[0031]Embodiment 1 (this embodiment adopts 3t intermediate frequency induction furnace to smelt molten iron)

[0032] A preparation method of high strength and toughness ductile iron, comprising the following steps:

[0033] The first step, chemical composition design, the material is based on mass percentage: C: 3.63%, Si: 2.59%, Mn: 0.42%, P≤0.05%, S≤0.02%, Mg: 0.041%, RE: 0.025%, Cu: 0.62%, the balance is Fe;

[0034] The second step, furnace material selection and intermediate frequency furnace smelting: use 3t intermediate frequency induction furnace to smelt molten iron, according to the mass percentage of pig iron: scrap steel: recycled material = 30%: 30%: 40% of the furnace material is added to the furnace for smelting, to ensure the raw material before treatment The chemical composition requirements of the molten iron, due to the use of cover-wrapped spheroidization treatment, the temperature of the molten iron drops less, and the temperature of the furnace is contr...

Embodiment 2

[0038] Embodiment 2 (this embodiment adopts 3t intermediate frequency induction furnace to smelt molten iron)

[0039] A preparation method of high strength and toughness ductile iron, comprising the following steps:

[0040] The first step, chemical composition design, the material is taken by mass percentage: C: 3.65%, Si: 2.58%, Mn: 0.31%, P≤0.04%, S≤0.02%, Mg: 0.046%, RE: 0.023%, Cu : 0.51%, the balance is Fe;

[0041] The second step, charge selection and intermediate frequency furnace smelting: use 3t intermediate frequency induction furnace to smelt molten iron, according to the mass percentage of pig iron: scrap steel: return charge = 60%: 10%: 30% charge is added to the furnace for smelting, to ensure the raw material before treatment The chemical composition of molten iron requires that the temperature of the molten iron be controlled at 1450-1480°C;

[0042] The third step, nodulizer selection and nodulizer treatment method: nodulizer is FeSiRE3Mg8 nodulizer, whic...

Embodiment 3

[0045] Embodiment 3 (this embodiment adopts 3t intermediate frequency induction furnace to smelt molten iron)

[0046] A preparation method of high strength and toughness ductile iron, comprising the following steps:

[0047] The first step, chemical composition design, materials are taken according to mass percentage: C: 3.72%, Si: 2.55%, Mn: 0.39%, P≤0.05%, S≤0.02%, Mg: 0.044%, RE: 0.034%, Cu : 0.50%, the balance is Fe;

[0048] The second step, furnace material selection and intermediate frequency furnace smelting: use 3t intermediate frequency induction furnace to smelt molten iron, and pig iron according to mass percentage: scrap steel: refurbishment material = 40%: 20%: 40% of furnace material is added to the furnace for smelting to ensure the raw material before treatment The chemical composition requirements of the molten iron, the temperature of the molten iron is 1450 ~ 1480 ℃;

[0049] The third step, the selection of nodulizer and nodulizer treatment method: the ...

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Abstract

The invention provides a preparation method for high-toughness nodular cast iron, which is a method for producing high-toughness nodular cast iron by utilizing a medium-frequency electric furnace and selecting materials such as cast iron which is low in sulfur, phosphor and manganese content, waste steel, and the like. The preparation method mainly comprises chemical component design, furnace burden selection, medium-frequency furnace smelting, a nodulizing agent selection and nodulizing treatment method, a nucleating agent selection and nucleating treatment method, and the like. The method disclosed by the invention does not need thermal treatment and desulfuration treatment, is less in processes, adopts a wet type sand production line to manufacture QT600-10 casting pieces, has casting efficiency higher than that of sand-lined iron type, and is low in cost. The produced nodular cast iron is high in strength, good in plasticity and toughness, can be used for components such as a transmission shaft, a rear axle shell, a differential mechanism shell, a bracket, and the like for a car and a tractor chassis.

Description

Technical field: [0001] The invention belongs to the field of metal materials, and relates to a method for preparing high-strength ductile cast iron by using an intermediate frequency electric furnace, in particular to a preparation method for high-strength ductile cast iron. Background technique: [0002] Due to its manufacturing and economic advantages, ductile iron has excellent comprehensive properties such as high strength, good toughness, and good wear resistance. It is used as an excellent engineering material instead of carbon steel and alloy steel. It is widely used in Internal combustion engine crankshafts, gears, connecting rods, casings, and cast pipes and other important components. [0003] With the continuous improvement of engine power, the performance requirements of related equipment and parts are getting higher and higher. Some parts working in special environments such as high speed, high pressure, high temperature, heavy load, corrosion, etc. often cause...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C22C37/04C21C1/10B22D1/00
Inventor 李平李锋军韩建普徐治新苏莉彭保中欧阳维强甄艳君汤明健范随长
Owner HENAN POLYTECHNIC UNIV
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