Composite inoculant

A composite inoculant and inoculant technology, applied in the field of metallurgy, can solve problems such as increased costs and waste of resources, and achieve the effects of increasing hardness, reducing segregation, and uniform distribution

Inactive Publication Date: 2012-07-11
王萍
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  • Abstract
  • Description
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Problems solved by technology

In order to remove phosphorus, corresponding technological measures must...

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Embodiment Construction

[0016] The present invention will now be described in further detail in conjunction with the accompanying drawings and preferred embodiments. These drawings are all simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, so they only show the configurations related to the present invention.

[0017] A composite inoculant, the weight ratio of the components of the inoculant is: carbon 20-30%; silicon 40-50%; rare earth 6-9%; strontium 0.6-0.8%; barium 2.2-2.8%; calcium 0.1- 0.2%; aluminum 0.1-0.2%; the balance is iron, and the preparation method of the present invention adopts the remelting method: after mixing the various elements prepared in the above ratio, remelt and crystallize in an electric furnace and pour into blocks, and break into 3- 8mm granular.

[0018] The rare earths mentioned in the present invention are the lanthanide elements in the chemical cycle: lanthanum, cerium, praseodymium, neodymium, pr...

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Abstract

The invention relates to a composite inoculant, which contains the following ingredients of: by weight, 20-30% of carbon, 40-50% of silicon, 6-9% of rare earth, 0.6-0.8% of strontium, 2.2-2.8% of barium, 0.1-0.2% of calcium, 0.1-0.2% of aluminium, and the balance being iron. In addition, 0.06-0.08 wt% of tin is added in the composite inoculant. The composite inoculant provided by the invention can effectively prolong graphitization depression time, substantially increase casting hardness and eliminate white castings, is especially in favor of improving the morphology and distribution of graphite in thin-walled castings, lowers the difference between crystal structures of positions with different thicknesses, reduces shrinkage tendency of castings, improves compactness of castings, raises cold-hot fatigue resistance and mechanical fatigue of castings, minimizes segregation of phosphor in cast iron, and makes phosphor become fine and uniformly-distributed binary iron phosphide eutectic in cast iron.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a composite inoculant. Background technique [0002] The existing types of inoculants are mainly divided into three types: 1. graphitized type; 2. mixed type; 3. stabilized type. General inoculants mainly refer to graphitization inoculants; mixed inoculants are mechanical mixtures of various inoculant materials; stabilized inoculants have stable pearlite in addition to graphitization functions. Silicon is graphitized, generally containing 60-80% silicon, the most widely used is FeSi75, in addition to being the main silicon, it can also be compounded with other elements, such as Ba, Ca, Mn, Zr, Sr, Ti, Mg, Al, C, B, Sn, etc. to play various specific roles. [0003] In the prior art, such as the "cast iron inoculation treatment substitute bismuth alloy" reported in the patent application number 88101363.3 invention patent application publication, the inoculant contains bismuth 4-14%; co...

Claims

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Application Information

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IPC IPC(8): C22C33/08C21C1/08B22D1/00B22D27/20
Inventor 王平
Owner 王萍
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