Vermicularizing inoculation method of vermicular graphite cast iron

A technology of vermicular graphite cast iron and molten iron, which is applied in the field of creeping inoculation and casting technology, can solve the problems of difficulty in meeting the requirements of use, deterioration of material properties, excessive creeping and bad, etc., to improve the inoculation effect, prolong the recession time, expand the Sensitive area effect

CN109371191AInactive Publication Date: 2019-02-22SHANGHAI HULIN HEAVY IND +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2019-02-22
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a vermicularizing inoculation method of vermicular graphite cast iron. In the smelting process of molten iron in a medium-frequency furnace, a high-purity rare earth alloy is fed in the molten iron before tapping, and is fully dissolved through an electromagnetic stirring effect of the medium-frequency furnace for primary vermicularizing treatment; a vermicularizing sensitive area of the molten iron is enlarged to improve the vermicularizing success rate and the vermicularizing effect; then, a rare earth-contained inoculation alloy is fed in a ladle after tapping for secondary vermicularizing treatment; the quantity of residual rare earth is supplemented to improve the inoculation effect and prolong the fading time; and obtained qualified vermicular graphite cast iron liquid is used for pouring castings. The method effectively improves the vermicularizing success rate, widens the vermicularizing sensitive range, prolongs the inoculation fading time, increases the product pass percent, and in particular, is suitable for a casting process of vermicular graphite cast iron cylinder jackets of marine diesel engines.
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Description

technical field

[0001] The invention relates to a casting process method, in particular to a vermicular inoculation method for vermicular graphite cast iron for pouring blank castings of marine diesel engine cylinder liners, and belongs to the technical field of casting. Background technique

[0002] The vermicular inoculation method refers to a processing method that uses a specific vermicular agent to make most of the graphite precipitate in the shape of vermicular and partly spherical during the solidification process of molten iron. The obtained material is called vermicular graphite cast iron.

[0003] The mechanical properties of vermicular graphite cast iron are close to those of nodular cast iron, and it has good anti-vibration, heat conduction and casting properties comparable to gray cast iron. At the same time, it has better plasticity and fatigue resistance than gray cast iron. More importantly, vermicular graphite Cast iron has better wear resistance than gray c...

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Embodiment Construction

[0017] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention cannot be limited by this.

[0018] see figure 1 and figure 2 , The embodiment of the present invention includes an intermediate frequency furnace 1 and molten iron 2; the intermediate frequency furnace 1 is an existing equipment, which plays the role of melting the molten iron 2 to be treated and the role of electromagnetic stirring. The molten iron 2 is the main body to be processed, and is the basic material for producing vermicular graphite cast iron.

[0019] The vermicular inoculation method of vermicular graphite cast iron according to the present invention is characterized in that, during the smelting process of the intermediate frequency furnace 1, the molten iron 2 is firstly added with a high-purity rare earth alloy 3 into the molten iron 2 before tapping, and through the The electro...