Carbon and silicon inoculant

Abstract

The invention relates to a carbon-silicon inoculant. The compositions of the inoculant in percentage by weight are 25 to 35 percent of carbon, 30 to 60 percent of silicon, less than 0.3 percent of calcium, less than 0.3 percent of aluminum, and the balance being iron. The granularity of the carbon-silicon inoculant is between 0.1 and 3 millimeters. The carbon-silicon inoculant has the advantages as follows: firstly, the carbon-silicon inoculant can effectively prolong the time of graphited fade; secondly, the carbon-silicon inoculant can obviously increase the hardness of cast, eliminate alloyed white of the cast, improve the form and the distribution state of graphite in thin-wall cast, and lessen the difference of crystal phase structures on positions with different thicknesses; and thirdly, the carbon-silicon inoculant reduces dispersed shrinkage tendency of the cast and improves the compactness of the cast. Moreover, the carbon-silicon inoculant can improve the performances of the cold and thermal fatigue resistance and the mechanical fatigue resistance of movable cast.

Description

technical field [0001] The invention relates to a carbon-silicon inoculant and belongs to the technical field of material modification chemical materials. Background technique [0002] The types of existing inoculants are mainly divided into three types: 1. graphitized type; 2. mixed type; 3. stabilized type. General inoculants mainly refer to graphitized inoculants; mixed inoculants are mechanical mixtures of various inoculated materials; stabilized inoculants have the function of stabilizing pearlite in addition to graphitization functions. Silicon-based inoculants are graphitized, generally containing 60% to 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. The above-mentioned inoculant can improve the resistance to cold and heat fatigue and mechanical fatigue of the casting, and can directly refine the gr...

AI Technical Summary

Problems solved by technology

The above-mentioned inoculants are used in the production of white billet iron castings, and the toughness and pull-out strength of the products are low