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Quenching and Tempering 350HB 65Mn steel with countersunk
Time:2019-06-27 17:08:24    Source:hlwjsd    Click:

This is new cargo of 65Mn liner plate for the us Taiwan client. All the 65Mn steel is under quenching and tempering processing, then the hardness could reach over 350HB. You can see that all the liner plates have countersunk, this kind of countersunk is very hard to be drilled out because of the extremely high hardness. On the other side, this type countersunk is the hardness to drill, unlike ordinary countersunk, it requires experienced worker with special drill at right speed, or you can not get such countersunk done.