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Smelting for ultra-large thick-wall spheroidal cast iron element and on site metamorphism treatment method thereof

A metamorphic treatment and super-large technology, which is applied in the field of smelting and on-site metamorphic treatment of ductile iron castings, can solve the problems of in-mold recession and graphite segregation of thick-walled castings, improve production technology and production, prevent burning loss, and enhance instantaneous effect of gestation

Active Publication Date: 2008-05-28
KOCEL EQUIP
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a unique and simple process, which successfully solves the problem of smelting large-tonnage molten iron in a small-tonnage induction furnace, and effectively solves the metamorphic treatment of large-tonnage nodular cast iron. A method of smelting and on-site modification of super-large thick-walled ductile iron castings for problems such as internal recession and graphite segregation at thick-walled parts

Method used

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Embodiment Construction

[0024] A method for smelting and on-site modification of super-large thick-walled ductile iron castings, characterized in that,

[0025] It includes the following steps:

[0026] a. Selection of melting equipment: select a set of electrical equipment to drive two induction furnaces less than or equal to 20 tons;

[0027] b. Adding and melting: first put the raw materials into one of the above-mentioned induction furnaces and melt them. The temperature during the melting process is kept at 1350-1390 ° C. After the melting is completed, the temperature for component testing and component adjustment should be lower than 1470 ° C. After the component adjustment is qualified Raise the temperature to 1480-1520°C for superheating, keep at the superheating temperature for 3-10 minutes, then tap the iron, and at the same time start another above-mentioned induction furnace for melting;

[0028] c. Heat preservation: Pour the molten iron that melted above into the heat preservation bag...

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Abstract

The invention relates to a process of melting and field modification treatment of melting ductile iron castings, in particular to a process of melting and field modification treatment of super large ductile iron castings with thick walls, which is characterized in that the invention includes the steps of selecting melting devices, feeding to melt, heat preservation, spheroidization, inoculation and pouring. The processing method of the invention is unique and simple, thereby successfully and effectively resolving the melting of a small-tonnage electric induction furnace on large-tonnage molten iron and the modification treatment of large-tonnage spheroidal graphite cast-iron, which also solves the problems of inner decline of casings with inner walls, graphite segregation of the thick walls and the like.

Description

technical field [0001] The invention relates to a method for smelting and on-site modification of ductile iron castings, in particular to a method for smelting and on-site modification of super-large thick-walled ductile iron castings. Background technique [0002] The smelting and modification treatment of ductile iron mainly refers to the melting and spheroidizing inoculation treatment of molten iron. Spheroidization is the growth of graphite in molten iron in a spherical shape through the action of a nodularizing agent added to the original molten iron. Inoculation is by adding an inoculant to the original molten iron to increase the number of nucleated protons in the original molten iron and increase the number of cores. Improve casting density and performance indicators. [0003] At present, induction furnaces are mainly used for smelting ductile iron, and induction melting furnaces generally have a capacity of no more than 30 tons due to equipment technical problems....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C1/10
Inventor 彭凡郝立昌王向阳彭志诚伏克松
Owner KOCEL EQUIP
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