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What is 4140 PHT steel?

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timbo1936

timbo1936

Mechanical
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Sep 28, 2006
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We have an old hand drawing of a machined plate and have this specification for material. I think it calls for Pre-Heat Treat. Is this correct?
 
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This means that you need to procure a preheatreated material to start with or heat treat the material prior to machining.
 
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