Process for producing vermicular cast iron by cupola-line frequency furnace duplex melting

Abstract

The invention discloses a process for producing vermicular cast iron by cupola-line frequency furnace duplex melting, which comprises the following steps of melting base molten iron in a cupola, regulating molten iron ingredients in a line frequency furnace, heating, refining, vermicularizing, inoculating, processing, and the like. The process adopts a novel cupola composition method, optimizes the processing conditions, does not require desulphurization processing during the process of melting the base molten iron in the cupola and can produce the vermicular cast iron stably. The process can be used for producing various grades of vermicular cast iron, is especially suitable for the reconstruction that a traditional casting department of producing gray cast iron is converted into a department of producing the vermicular cast iron and has the advantages of less investment, simple operation and stable product quality.

Description

technical field [0001] The invention belongs to the field of casting technology of mechanical parts, and in particular relates to a molten iron smelting and vermicularization treatment process method for producing vermicular graphite cast iron materials. Background technique [0002] Vermicular graphite cast iron is a new type of high-strength cast iron developed in the 1970s. The production method is to add a suitable vermicularizing agent to molten iron when tapping, carry out vermicularization treatment, and then add an inoculant for inoculation treatment. Vermicular graphite cast iron determines the vermicular rate according to the proportion of vermicular graphite in the graphite form. [0003] When compacted graphite cast iron is used to produce diesel engine cylinder head castings with complex structures, the quality requirements for molten iron are relatively high. Controlled stable, high creep rate is crucial to improve the yield of cylinder head castings. In wor...

AI Technical Summary

Problems solved by technology

In workshops that use traditional methods to produce gray cast iron cylinder heads, most of them use cupola-power frequency furnaces to smelt molten iron. High, requiring desulfurization treatment, industrial frequency furnace refining and temperature raising, vermicular inoculation and other processes, which consume more manpower and material resources, and will affect the control of vermicular rate due to fluctuations in sulfur content, reducing product quality