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

A metamorphic treatment, super-large technology, 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, and achieve the solution of metamorphic treatment, prevention of burning damage, and spheroidization inoculation. The effect of recession

Active Publication Date: 2009-09-09
KOCEL EQUIP
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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

[0023] A method for smelting and on-site modification of ultra-large thick-walled ductile iron, which is characterized in that it includes the following steps:

[0024] a. Selection of melting equipment: select a set of electrical equipment to drive two induction furnaces less than or equal to 20 tons;

[0025] b. Feeding and melting: the raw materials are first charged into one of the above-mentioned induction electric furnaces and melted. The temperature during the melting process is maintained at 1350~1390℃. After the melting is completed, the temperature during component detection and component adjustment should be less than 1470℃, and the component adjustment is qualified. Raise the temperature to 1480~1520℃ for overheating, keep it at the overheating temperature for 3~10 minutes, then tap the iron, and start another above-mentioned induction electric furnace for melting;

[0026] c. Insulation: Pour the molten iron into a heat preservation bag for heat preservation, adjust t...

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Abstract

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, which is characterized in that it includes the following steps: selecting melting equipment, Feed melting, heat preservation, spheroidization, inoculation and pouring; the process method of the present invention is unique and simple, successfully solves the problem of melting large-tonnage molten iron in a small-tonnage induction furnace, and effectively solves the deterioration treatment of large-tonnage nodular cast iron. Recession problems and graphite segregation at thick walls.

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 irons. Background technique [0002] The smelting and modification treatment of ductile iron mainly refers to the melting and spheroidization of molten iron. Spheroidization is the effect of a spheroidizing agent added to the raw molten iron to make the graphite in the molten iron grow in a spherical shape. Inoculation is by adding an inoculant to the raw molten iron to increase the nucleation protons in the raw molten iron and increase the number of cores. Improve the density and performance indicators of castings. [0003] At present, the smelting of ductile iron mainly uses induction electric furnaces, and the general capacity of induction smelting electric furnaces does not exceed 30 tons due to equipment technical problems. For castings with a pouring weight...

Claims

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Application Information

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Patent Type & Authority Patents(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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