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Method for producing spheroidal graphite cast iron and vehicle component using said spheroidal graphite cast iron

A technology of ductile iron and vehicle parts, applied in the field of vehicle parts, can solve the problems of rare earth price and production fluctuation, price and supply instability, etc., and achieve the effect of stable supply

Active Publication Date: 2014-06-11
AKEBONO BRAKE IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is believed that prices and production volumes of rare earths will fluctuate considerably in the future, depending on conditions in producing countries, and there is a high probability that both prices and supply volumes will become extraordinarily volatile

Method used

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  • Method for producing spheroidal graphite cast iron and vehicle component using said spheroidal graphite cast iron
  • Method for producing spheroidal graphite cast iron and vehicle component using said spheroidal graphite cast iron
  • Method for producing spheroidal graphite cast iron and vehicle component using said spheroidal graphite cast iron

Examples

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Embodiment

[0131] The present invention will be explained in more detail below with reference to examples in which the as-cast thin-walled ductile iron of the present invention is used to produce brake calipers for automobiles. However, the present invention should not be construed as being limited to the following examples.

[0132] For the ductile irons of Examples (Examples 1 to 13 and Comparative Examples 1 to 8), a remelted cast iron material and an iron scrap material were used as raw materials. The ratio of recycled material to iron scrap material in raw materials is about 1:1. The raw materials are melted using a high-frequency furnace. However, C, Si, Mn, S, Cu, and Sn as additive elements are suitably added thereto to adjust the molten iron so that the molten iron contains a composition corresponding to FCD450 (JIS G5502), that is, the molten iron has a composition containing: In terms of mass %, 3.0 to 4.5% of C, 2.0 to 3.0% of Si, 0.2 to 0.4% of Mn, 0.006 to 0.020% of S, 0....

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Abstract

The objective of the present invention is to provide a high-performance spheroidal graphite cast iron that uses a spheroidizing agent that does not contain a rare earth element. The present invention pertains to a method for producing a spheroidal graphite cast iron having a specific final composition by performing spheroidizing processing using a spheroidizing agent that is an Fe-Si-Mg-Ca-based alloy that does not contain a rare earth element, performing inoculation processing using a first Fe-Si-based inoculation agent, and then performing molten pouring inoculation processing using a predetermined amount of a second Fe-Si-based inoculation agent containing 45-75% of Si, 1-3% of Ca, and no greater than 15 ppm of Ba.

Description

technical field [0001] The present invention relates to a production method of ductile iron used in products having a thin-walled portion, and also relates to a vehicle component using the ductile iron and having a thin-walled portion. Background technique [0002] Since ductile iron has excellent tensile strength and ductility, ductile iron has been widely used in recent years as parts of vehicles including motor vehicles, machine parts, and the like. In particular, ductile iron is used in brake calipers, which are important as safety components for vehicles such as motor vehicles, in order to ensure their quality. [0003] Due to the need to reduce weight in these articles, ductile iron is also required to be reduced in thickness. In the case of ductile iron being used as a cast metal having a thin-walled portion, the cooling rate increases in the thin-walled portion thereof, which leads to the formation of a chill phase (abnormal structure). Since this chilled phase has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C1/10B22D1/00B22D27/20C22C33/10C22C37/04
CPCB22D1/00B22D27/00C22C37/04C21C7/0006C22C33/10C21C1/105C22C33/08C22C28/00C21D5/00B22D27/20C22C37/10C21C2300/08
Inventor 堀谷贵雄马场司时山拓也佐藤隆出井浩
Owner AKEBONO BRAKE IND CO LTD
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