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How to distinguish gray cast iron from ball cast iron

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How to distinguish gray cast iron from ball cast iron

Date:2018-03-02 Author: Click:

Graphite in gray iron tissue is laminated, and graphite in ductile iron tissue is spheroidal.

Organizational differences lead to their performance also has a huge difference: low strength of gray cast iron and plastic (split between flake graphite substrate, cause stress concentration), the brittleness is big, good damping performance. Mainly used to produce some strength requirement is not high, main compressive stress under various kinds of case base. Nodular cast iron: spherical graphite to minimize the effect on matrix of fragmentation, minimum stress concentration effect, so its strength is very high, can and medium carbon steel gas beauty, can give full play to the performance of the matrix, and have good plasticity and toughness. Commonly used to make some require high tenacity and complicated shape (casting performance is better than steel, but is worse than gray cast iron) artifacts, than Parts such as crankshaft links for internal combustion engines.

Gray iron can be regarded as the inclusion of steel matrix and flake graphite. So the less graphite, the finer, the more uniform, the higher the mechanical properties of cast iron. The content of graphite in cast iron is related to the content of C and Si, especially C. However, low content of C and Si will increase the tendency of white cast iron to form white or hemp structure.

In order to improve the mechanical properties of cast iron, "gestation treatment" can be adopted, that is, a small amount of "gestation agent" can be added into the iron water before casting. In this way, a large number of artificial crystal nuclei are produced during the solidification of cast iron to promote graphite nucleation and crystallization. Not only can the white mouth be prevented, but also the graphite flake crystal can be significantly refined.

The most commonly used inoculants are ferrosilicon and calcium silicate alloys, and the amount of incorporation is generally about 0.4% of the total weight of iron and water. After inoculation, the strength of cast iron has been greatly improved, and its shape and toughness have also been improved.

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Phone: 18940018888

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Telephone: 024-62908888

Email address: sjj8000@sohu.com

Address: no. 15, liaozhong commercial street, shenyang city

Fax: 024-87880508

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