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Method for spheroidizing molten metal of spheroidal graphite cast iron

A treatment method and technology of molten metal, which is applied in the field of graphite spheroidization treatment, can solve the problems of not clearly teaching the appropriate amount of molten metal to be added

Active Publication Date: 2015-09-09
TOSHIBA MASCH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this document, there is no clear teaching about the appropriate addition amount relative to the molten metal

Method used

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  • Method for spheroidizing molten metal of spheroidal graphite cast iron
  • Method for spheroidizing molten metal of spheroidal graphite cast iron
  • Method for spheroidizing molten metal of spheroidal graphite cast iron

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Experimental program
Comparison scheme
Effect test

Embodiment

[0050] The results of experiments conducted to confirm the effect of the graphite spheroidization treatment will be described below.

[0051] A mold for casting a test piece with a wall thickness of 100 mm was prepared. The mold was designed so that the eutectic solidification time was 1.0 ks.

[0052] A granular graphite spheroidizing agent with the following composition was prepared.

[0053] Si: 75wt%

[0054] Mg: 5.1wt%

[0055] Ca: 0.7wt% or 2.0wt%

[0056] Al: 0.7wt% or 2.0wt%

[0057] RE: 0.15wt%, 0.3wt%, 0.6wt% or 1.3 wt%

[0058] S: 0.33 wt%, 0.67 wt%, or 2.0 wt%

[0059] The remainder: Fe and inevitable impurities.

[0060] by image 3 As shown in the inoculation method in the bag, the above-mentioned graphite spheroidizing treatment agent was added to 30 kg of the molten metal before treatment. By adding about 1.5 wt% of the spheroidization treatment agent to the molten metal before the treatment, the amount of each element added to the molten metal is as follows.

[0061] Mg: 0.0...

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Abstract

The present invention uses a graphite spheroidizing agent containing: 30-80 wt% of Si, Mg, one RE (rare earth element) selected from 80-100 wt% pure Ce or 80-100 wt% pure La, Ca, and Al. This graphite spheroidizing agent is added so as to satisfy the following conditions: the amounts added are such that in relation to the molten metal overall, the RE constitutes 0.001-0.009 wt%, the Ca constitutes 0.001-0.02 wt%, and the Al constitutes 0.001-0.02 wt%; and after the graphite spheroidizing treatment, the molten metal contains 0.03-0.07 wt% of Mg. As a result, it is possible to inexpensively suppress the crystallization of chunky graphite and the decline in mechanical properties in a thick product comprising spheroidal graphite cast iron.

Description

Technical field [0001] The invention relates to a graphite spheroidization treatment method for spheroidal graphite cast iron metal melt. Background technique [0002] Spherical graphite cast iron is a material that spheroidizes graphite in a cast state and has excellent mechanical properties (Young's modulus, tensile strength, elongation). The spheroidization of graphite is carried out by adding a graphite spheroidizing agent to the ladle. The graphite spheroidizing agent contains Mg, rare earth elements (hereinafter referred to as "RE"), Ca, Al, and the like. [0003] In large thick-walled products or thick-walled parts of products (hereinafter collectively referred to as "thick-walled parts") with slower cooling rates, the eutectic solidification time is long, so in the metallic structure of spheroidal graphite cast iron, abnormal graphite structure is Short rod graphite is easy to crystallize. The crystallization of short rod-shaped graphite will cause the Young's modulus, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C1/10B22D27/20C22C33/10
CPCC22C33/10C21C1/10B22D27/20B22D1/00C21C1/105C22C28/00C22C33/08C22C37/04C22C37/10C22C38/002C22C38/005C22C38/02C22C38/06C21C7/0006
Inventor 藤本亮辅本间周平横山豪志二瓶祐仁小关俊明
Owner TOSHIBA MASCH CO LTD