4140 processing

[bgstic]

What's the difference between "4140 quench & temper" and "4140 heat treat & stress relieved"? I thought the terms were interchangable but my suppliers seem confused.

 

[arunmrao]

4140 heat treat and temper though not a scientific term might mean normalize and temper. The other term refers to a faster rate of cooling in oil or water or polymerfollowed by a tempering cycle.

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[bgstic]

so the term "heat treat and stress relieve" is too loose a term?

 

[arunmrao]

Yes. Heat treat is a common term used for annealing.normalising,tempering solutionizing,etc. What process is exactly followed has to be specified.

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[kenvlach]

Go to

http://www.matweb.com

and search for 4140 steel. 32 results. Note the wide range of tempering temperatures. A lower tempering T will give greater strength but less ductility (elongation at break). Click on any listing to see the properties and specifications (ASTM, BS (UK), DIN, JIS, SAE AMS, etc.).

 

[bgstic]

Great, thanks for the help.