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Subject: Hardness problem in high chrome iron.
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Date: 06/16/02 at 1:55 AM
Posted by: Arun Rao
During the manufacture of high chrome iron pump parts,we have been getting low hardness350-400BHN. It is desired to get a hardness of over 500BHN.
Often the as cast hardness is in the range of 450-470,but upon hardening the hardness drops.
The nominal chemistry is 23-24% Cr and 2.8-3.1%C . Also the hardening cycle is heat to 980*C soak for 4 hrs and fast air cool.
Please suggest suitable corrective measures
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