Abstract
At the Moscow Coke and Gas Plant an air compressor has been used to investigate fractured plates of type 30KhGSA steel with HRC hardness values of 32-51. A Rockwell instrument was used to measure the hardness of each fractured plate (10 impressions each side) and each plate was checked by a magnetic luminscence method on a type LD-4 instrument to detect cracks. Finds that the most durable are valve plates made of type 30KhGSA steel and having a HRC of 43-46 after heat treatment. Notes that the most durable valve plates had the least sensitivity to stress concentration created by fatigue cracks.
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