Characteristics of blowing head: high hardness, good toughness and good wear resistance. The service life has been greatly improved, which is suitable for the blowing of the cylinder.

The blowing head USES new cast iron material including low - tin cast iron, copper - chromium cast iron, medium - silicon thin, medium - silicon molybdenum rare earth, low - tin creep iron, low - aluminum vermicular iron. In order to improve the life, several new cast iron has been developed in place of the original HT200 cast iron, for example, smri-86.