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.
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.
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.).