Spheroidizing agent for spheroidal graphite cast iron, and preparation method thereof

A technology of nodular cast iron and nodularizing agent, which is applied in the field of nodularizing agent for nodular cast iron and its preparation, and achieves the effects of high ferrite content, high toughness and high nodularization rate

Active Publication Date: 2012-03-28
宁波康发铸造有限公司
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AI Technical Summary

Problems solved by technology

In the conventional ductile iron casting process, usually only one nodulizer is added to spheroidize it, but one nodulizer always has many defects due to the limitation of quality and composition

Method used

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  • Spheroidizing agent for spheroidal graphite cast iron, and preparation method thereof

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Embodiment Construction

[0015] There are many kinds of spheroidizing elements found so far, such as Ce, Mg, Ca, Y, Na, Bi, Tn, etc., but many of these elements can only show spheroidizing ability in pure molten iron, and have real industrial value The only ones are Mg, Ca, Y and so on.

[0016] Among them, Mg is the strongest spheroidizing agent, which can spheroidize graphite in molten iron with hypoeutectic, eutectic and hypereutectic components and has good desulfurization and oxygen absorption capacity. But only when pure magnesium is used as the nodulizer, it has the following disadvantages: (1) the boiling point of Mg is lower than the molten iron temperature, and Mg directly added to molten iron has violent boiling, unsafe operation and low absorption rate of molten iron to Mg, The spheroidization is unstable; (2) The molten iron treated with pure Mg shrinks greatly when it solidifies, and the shrinkage cavity formed inside the casting is difficult to completely remove; (3) It is difficult to ...

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Abstract

The invention discloses a spheroidizing agent for spheroidal graphite cast iron, belonging to the field of cast iron metallurgical technology, and aiming at overcoming the defects that the spheroidizing effect of the spheroidizing agent in the prior art is poor, and the mechanical properties of the obtained spheroidal graphite cast iron can not meet the requirements. The spheroidizing agent for the spheroidal graphite cast iron comprises the components by mass percent: 2-7% of Y, 7-9% of Mg, 37-44% of Si, 2-3% of Ca, 0.3-0.4% of Sb, 0.1-0.4% of Mn, 0.2-0.5% of Al, 0.2-0.5% of Ti, and the balance of Fe and unavoidable trace elements. The invention also discloses a preparation method of the spheroidizing agent for the spheroidal graphite cast iron. The spheroidizing agent is good in spheroidizing effect, and the spheroidal graphite cast iron obtained by spheroidizing has high toughness, ferrite quantity and spheroidization rate so as to be especially suitable for castings of various machine moulds with high strength and impact power.

Description

technical field [0001] The invention relates to the technical field of nodular cast iron production, in particular to a nodularizer for nodular cast iron and a preparation method thereof. Background technique [0002] Ductile cast iron is spheroidized graphite obtained through spheroidization and inoculation treatment, which effectively improves the mechanical properties of cast iron, especially improves plasticity and toughness, thereby obtaining higher strength than carbon steel. Ductile cast iron is a high-strength cast iron material developed in the 1950s. Its comprehensive performance is close to that of steel. It is based on its excellent performance that it has been successfully used to cast some complex stress, strength, toughness, and wear resistance. Parts with high performance requirements. [0003] Spheroidization refers to the process in which graphite in cast iron becomes graphite crystallization under the influence of added nodularizing agent. In conventiona...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C1/10C22C33/08
Inventor 俞光杰李建国刘锐
Owner 宁波康发铸造有限公司
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