Sulphidation of Alloy Cast Iron at High Temperatures

Abstract

The sulphidation of iron and steel at high temperatures is lately discussed in many literatures. The author has experimented on the sulphidation of cast iron at high temperatures. The following experimental results were obtained.
(1) Al, Cr, Cu, Mn, Si V, Zr gave good effect on the sulphidation-resistance of cast iron when added in a small quantity, especially Al, Cr, Zr showed remarkable effect. The addition of Al, Mo, W enhanced the sulphidation-resistance of cast iron with increase of their additions, but the W raised it in a slight ratio. In the case of Cu and Zr, the addition in excess rather increased the sulphidation rate. Ti was found to give no good effect.
(2) The alloying element seemed to concentrate on the inner or outer layer of sulphide coating and to make it compact, consequently to develop the sulphidation-resistance. In this experiment, the sulphide coating of alloy cast iron resembled that of ordinaly cast iron.