Steel Blocks Develop Magnetic Properties
Steel Blocks Develop Magnetic Properties
(OP)
We machine a family of parts from steel blocks. A recent change in both material and process have caused the blocks to develop magnetic properties as they are machined. Generally, the magentic field is strongest closest to the location of the most recent cut. The forgings are approximately 22" x 16" x 16". Material is ASTM A646, AISI 4140, normalized, quenched, & tempered to 311-369 BHN.
Anybody know what might cause this?
Anybody know what might cause this?





RE: Steel Blocks Develop Magnetic Properties
RE: Steel Blocks Develop Magnetic Properties
RE: Steel Blocks Develop Magnetic Properties
RE: Steel Blocks Develop Magnetic Properties
You can also track the magnetic tail of the earth by attaching a magnet with a shiny surface to a single oriented thread strecthed between floor and ceiling and shining a ruby laser on it and watching the track on a wall. A thread from an old mountian climbing rope works well for this since they are almost total free of twist.
Way off the track, sorry
Barry1961
RE: Steel Blocks Develop Magnetic Properties
RE: Steel Blocks Develop Magnetic Properties
RE: Steel Blocks Develop Magnetic Properties
BTW, if you want to demagnetize a specimen completely you align it east-west and then use what ever method to demag, decreaseing AC field, heating above its Curie temperature etc.
RE: Steel Blocks Develop Magnetic Properties
RE: Steel Blocks Develop Magnetic Properties