Titanium inclusions in cast blanks of 0Kh23N28M3D3T steel

Conclusions

• 1. The degree of contamination of centrifugally cast blanks of 0Kh23N28M3D3T steel with titanium compounds depends on the concentration of titanium in the blank and the type of macrostructure. It is higher in blanks with zones of equiaxial crystals at the inner wall and in blanks with higher concentrations of titanium.

• 2. The character of the precipitation of titanium compounds depends on the wall thickness of the blank. In thin-walled blanks these precipitations are principally points; with increasing wall thicknesses the titanium compounds have a greater tendency to precipitate in the form of a network on the boundaries of crystals and between dendrites.

• 3. The network of titanium compounds in thick-walled centrifugally cast blanks is harmful, since it substantially weakens the metal and acts as the source of defects originating during hot rolling.