Board: General pump problems
Topic: Screw Pumps

Article from Varun Passi at Aug 28 2009, k:ih

Screw Pumps I have a specification where the screw/shaft of a screw pumps are to be made of 13% cr steel. but the alternate material offered to me is 16MnCrS5. I would like to know out of the 2 which is better and why? help of any sort will be great.

Answer from Bhalchandra Padwal at Sep 16 2009, k:ih

Materially Difference Advantage Hi 13% cr steel is a superior grade material then 16MnCr5. This due to Harding property offered by % of cr in steel composition. Generally Rotor are made of Harden steel so that they give very long life. But as grade of material changes so the price of manufacturing. for example 16MnCr5 will cost me 16MnCr5 0.8 Euro/Kg and for 13% Cr. steel it will cost 2.14 Euro/Kg for 20 mm rod material. Which is three time of Cr 5 material. Moreover Harder the material more time and labor is required to manufacturer it. Dose cost it will cost you four time of normal 16MnCr5 steel. If you need any further assistance, we are at your disposal For seepex India Pvt. Ltd.