Carbon steel screws in the large batch heat treatment p […]
Carbon steel screws in the large batch heat treatment process, the metallographic method is good, micro-hardness method is also good, can only be regular sampling. Because carbon steel screws have long inspection times and high costs.
In order to timely determine the carbon control of the furnace, preliminary determinations of decarburization and carburization can be made using spark detection and Rockwell hardness testing. Spark detection is to quench the fire parts, in the grinder from the table and gently grinding sparks to determine the surface and the heart of the carbon is the same. Of course, this requires the operator to have skilled skills and spark identification capabilities.