High-strength cast iron inoculation production process

A production process and high-strength technology, which is applied in the field of inoculation and strengthening process, can solve the problems such as the graphite shape can not meet the requirements, the strength of the cylinder liner is low, and the service life is short, and the effect of increasing hardness, stable process and improving tensile strength is achieved.

Inactive Publication Date: 2012-04-18
贾维珍
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AI Technical Summary

Problems solved by technology

[0002] At present, with the increasing shortage of energy and raw materials, the demand for engines is developing in the direction of high power and small volume, so the mechanical performance of cylinder liners is very high. The traditional concept of cylinder liner casting technology cannot meet the new technical requirements. The metallographic structure and graphite shape of the sleeve cannot meet the requirements, and the cylinder liner has low strength, poor wear resistance, short service life, and poor processing performance.

Method used

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Embodiment Construction

[0009] The furnace is fed according to the ratio of raw materials: pig iron: returned material: scrap steel = 5:2:3, and is smelted in an electric furnace. During the smelting process, the chemical composition is checked at 1400 ° C, and the alloy elements are adjusted appropriately. After meeting the requirements, the temperature rises rapidly To above 1500℃, the silicon barium inoculant added in the front ladle and the transfer ladle, the silicon content is not less than 72%, the size is 3-5mm, and the molten iron is poured into the ladle for inoculation, so that the inoculant can be fully melted, However, the molten iron must be poured within 5 minutes, otherwise the inoculation effect of the inoculant will seriously decline and affect the inoculation effect. Add 0.15% silicon-strontium inoculant to the casting crucible, and cast with flow inoculation at a temperature not lower than 1440°C. When the blank temperature is lower than 700°C, the mold is released, and the entire ...

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Abstract

The invention provides a high-strength cast iron inoculation production process. The technical method to solve technical problems comprises: adding Si-Ba inoculant into a front furnace and a tundish, wherein the content of Si is no less than 72 percent, and the specification of the Si is 3-5mm, using molten iron in the front furnace to flush the inoculant into a casting package for inoculation so that the inoculant can be fully dissolved. A Si-Sr inoculant of 0.15 percent is added into a casting crucible, stream inoculation is carried out at the temperature no lower than 1440 DEG C for casting, mold stripping is carried out when the temperature of a blank is lower than 700 DEG C, and thus the whole process of casting and composite inoculation reinforcement is completed. Due to the three inoculations, the metallographical structure of a cylinder jacket is stable, the graphite morphology can be effectively changed, the hardness is appropriately increased and the tensile strength is significantly improved based on A-type graphite, and the process is stable.

Description

Technical field [0001] The invention relates to an inoculation strengthening process in the casting and forming process of an alloy cast iron cylinder liner. Background technique [0002] At present, with the increasing shortage of energy and raw materials, the demand for engines is developing in the direction of high power and small volume, so the mechanical performance of cylinder liners is very high. The traditional concept of cylinder liner casting technology cannot meet the new technical requirements. The metallographic structure and graphite shape of the sleeve cannot meet the requirements, and the cylinder liner has low strength, poor wear resistance, short service life, and poor processing performance. Contents of the invention [0003] The invention provides a process method for inoculating and strengthening the cylinder liner. Through the process, the metallographic matrix structure of the cylinder liner is dense and stable, the hardness is appropriately increase...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D1/00
Inventor 贾维珍严方张强华张加中
Owner 贾维珍
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