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Cast iron nodulizer and nodulizing process

A spheroidizing agent, cast iron technology, applied in the field of cast iron spheroidizing treatment technology, can solve the problems of inability to treat a small amount of molten iron spheroidization, increase of silicon content in molten iron, waste and other problems

Inactive Publication Date: 2007-06-27
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the spheroidizing mixture only contains 9% metal magnesium, which greatly increases the amount of the spheroidizing mixture, and will also lead to rapid cooling of molten iron
[0007] In short, the disadvantages of the pure magnesium spheroidization treatment method are that special equipment is required, the time for preparing the tundish is too long, and it is impossible to spheroidize a small amount of molten iron (≤50Kg) and cause serious waste
However, if the master alloy is used as a spheroidizer to spheroidize cast iron, the silicon content of the treated molten iron will increase, which is not suitable for the production of low-silicon high-strength nodular cast iron.

Method used

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Embodiment Construction

[0015] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0016] Tables 1 to 3 show the results of different experimental hot metal spheroidization treatments.

[0017] The molten iron is melted in a 20Kg or 50Kg non-vacuum induction furnace. Chemical composition of pig iron: 3.70% C, 0.51% Si, 1.70% Al, 0.60% Mn, 0.10% P, 0,04% S. Preparation of spheroidized mixture: 60% metal magnesium powder, 28% MgO, 12% phenolic resin binder are evenly mixed, cured and sintered at 300°C. The molten iron is melted and superheated to 1400°C. After removing slag from the surface, the pre-prepared spheroidizing mixture is added to the molten iron using the bell jar method. After the liquid metal has stopped bubbling, the bell jar is removed, deslagged and poured.

[0018] In order to optimize the component ratio (embodiment 1~embodiment 9) of spheroidizing mixture, still adopt same pig iron, its chemical...

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Abstract

The cast iron nodulizer and nodulizing process relates to casting technology. The cast iron nodulizer contains metal Mg powder in 30-70 wt%, MgO in 18-60 wt% and adhesive, such as phenolic resin, in 10-12 wt%. During the nodulizing process, the dispersed mixture is solidified at 250-300 deg.c and added into molten iron at 1350-1450 deg.c through one bell process before desulfurizing and nodulizing. Through inoculation, the graphite nodules are fine and round. By means of the cast iron nodulizer and nodulizing process of the present invention, low silicon and high strength aluminum nodular cast iron may be obtained.

Description

technical field [0001] The invention relates to the field of casting, that is, it belongs to the cast iron spheroidizing process, and the process can be applied to the small-batch production of high-strength cast iron pieces. technical background [0002] Ductile iron castings are widely used in the fields of automobile, machine and equipment manufacturing, and there are various types of nodularizers for the production of ductile iron. At present, master alloys containing magnesium and rare earths are mainly used as nodularizers in production. Some other nodulizers also exist, such as pure magnesium, mechanical mixtures containing magnesium. The selection of spheroidizing agent and spheroidizing treatment method mainly depends on the production conditions, the performance of castings, etc. [0003] Patent CN86105963 is a cast iron spheroidizing treatment method using pure magnesium as a spheroidizing agent. The magnesium block is placed in the ladle cover, and the gap bet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/10
Inventor 张青来
Owner JIANGSU UNIV