2Cr16-T is a kind of excellent special metal material for well ventilation. Itsstructural state is similar to mutual fusion of many miniature steel balls. It is connected evenly into network micro-pores wholly. Area of structural micro-pores is account for about 30% so that air can be through any position smoothly. And it possesses good mechanical cutting performance and properties of anti-rust and anti-acid and is applied widely in plastic mould exhaust and other occasions of reducing pressure by exhausting.