... , the inner surface is very smooth and hard, with wear and corrosion resistance difficult to stick materials and so on ... by 1Cr18Ni9Ti, but also by the careful machining and polishing. Wear and corrosion resistance, life > 15000 hours. (4), cold mixing ... machine mixing propeller made of stainless steel, polished, wear, corrosion resistance, long service life. 3 groups impeller. (5), ...