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As-cast high-strength and ductility synthetic nodular cast iron QT800-5 and preparation method thereof

A ductile iron, high-strength technology, applied in the field of high-performance metal material manufacturing, can solve the problem that the strength is difficult to meet the material requirements of higher fatigue strength and comprehensive performance, achieve good spheroidizing effect, reduce the amount of spheroidizing agent, increase The effect of the number of graphite balls

Active Publication Date: 2018-10-12
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the strength is still difficult to meet the material requirements of higher fatigue strength and comprehensive performance

Method used

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  • As-cast high-strength and ductility synthetic nodular cast iron QT800-5 and preparation method thereof
  • As-cast high-strength and ductility synthetic nodular cast iron QT800-5 and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0036] Example 1, see figure 1 :

[0037] The invention provides an as-cast high-strength and toughness synthetic ductile iron QT800-5, which comprises the following components and their mass percentages: C: 3.76%, Si: 3.35%, Mn: 0.197%, P: 0.022%, S: 0.016%, Ni: 0.714%, Cu: 0.633%, Mg 残 : 0.059%, Fe: 91.164%, other trace elements: balance.

[0038] A preparation method of as-cast high-strength and tough synthetic nodular cast iron QT800-5 (melting in a 100Kg medium-frequency induction furnace), comprising the following steps (percentages are mass fractions):

[0039] (1) Ingredients and smelting: Add 3.6% recarburizer, 27.1% scrap steel (45# steel), 59.3% pure iron with low sulfur and low manganese, and 10% ductile iron return charge to the intermediate frequency induction furnace, and heat up to 1550 ℃ for smelting to obtain the original molten iron;

[0040] (2) Alloying: Add 75% ferrosilicon and 0.6% cathode copper of its quality 3% to the original molten iron, and con...

Embodiment 2

[0048] Example 2, see figure 2 :

[0049] The invention provides an as-cast high-strength and toughness synthetic nodular cast iron QT800-5, which comprises the following components and their mass percentages: C: 3.942%, Si: 3.423%, Mn: 0.173%, P: 0.030%, S: 0.016%, Ni: 0.738%, Cu: 0.623%, Mg 残 : 0.065%, Fe: 90.834%, other trace elements: balance.

[0050] A preparation method of as-cast high-strength and tough synthetic nodular cast iron QT800-5 (melting in a 100Kg medium-frequency induction furnace), comprising the following steps (percentages are mass fractions):

[0051] (1) Ingredients and smelting: Add 3.2% recarburizer, 27.9% steel scrap (45# steel), 56.9% pure iron with low sulfur and low manganese, and 10% ductile iron return charge to the intermediate frequency induction furnace, and heat up to 1550 ℃ for smelting to obtain the original molten iron;

[0052] (2) Alloying: Add 75 ferrosilicon and 0.62% cathode copper of its quality 3.4% to the original molten iro...

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Abstract

The invention provides a kind of as-cast high-strength and ductility synthetic nodular cast iron QT800-5 and a preparation method thereof. The as-cast high-strength and ductility synthetic nodular cast iron QT800-5 comprises, by mass, 3.70-3.95% of C, 3.3-3.5% of Si, less than or equal to 0.2% of Mn, less than or equal to 0.035% of P, less than or equal to 0.02% of S, 0.5-0.7% of Cu, 0.55-0.75% ofNi, 0.035-0.65% of Mg residues, and the balance Fe and microelements. The preparation method of the as-cast high-strength and ductility synthetic nodular cast iron QT800-5 comprises the following steps of mixing and smelting; alloying; pretreatment and spheroidizing; and inoculation treatment and pouring. The preparation method comprises the steps of smelting base iron melt in a medium-frequencyinduction furnace through steel scrap recarburization; adding silicon iron and cathode copper to conduct alloying; bringing in alloying elements nickel through a spheroidizing agent; conducting pretreatment, spheroidizing and inoculation treatment; and finally conducting pouring. The as-cast high-strength and ductility synthetic nodular cast iron QT800-5 prepared through the method has high strength, good ductility and toughness and excellent comprehensive performance.

Description

technical field [0001] The invention relates to the technical field of manufacturing high-performance metal materials, in particular to a high-strength and tough synthetic nodular cast iron QT800-5 in an as-cast state and a preparation method thereof. Background technique [0002] Due to its low cost and excellent comprehensive performance, ductile iron is widely used in engineering fields and maintains continuous and stable development and growth. Replacing stamped and welded parts and steel castings with ductile iron castings can bring many advantages such as cost reduction, stable structure, and increased rigidity, but it also puts forward higher requirements for the comprehensive performance of ductile iron, and fatigue strength is the most important important indicators. Higher strength combined with higher elongation often yields the best fatigue properties. Therefore, the development of ductile iron with high fatigue strength, especially in the as-cast state, is an ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/04C22C37/10C21C1/10C22C33/12
CPCC21C1/105C22C33/12C22C37/04C22C37/10
Inventor 范晓明张运权刘熠杰文红艳熊映
Owner WUHAN UNIV OF TECH
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