Production of High Strength Gray Iron Hydraulic Castings with Cupola Melting

Le résumé fourni par la source

The reason causing poor quality of the HT300 grade hydraulic gray iron castings was revealed by analyzing their chemical composition and microstructure.The measures to produce high grade gray iron castings under cupola melting condition were found including to control the chemical composition as follows: 3.1% C,2.0%Si,0.65%Mn,≤0.15% P,0.04%~0.08%S;to keep the tapping temperature at about 1 360 ℃.The result showed that the pearlite volume fraction of casting was higher than 95%,the carbide volume fraction was less than 1%,A type graphite was more than 90%,hardness was of 190~220 HB,mechanical properties and microstructure of casting reached requirements of HT300 grade or was even higher so that the material quality met the technical specification of hydraulic parts.

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