From Anvilfire, posted by Quenchcrack:
Quote:
5160
Anneal at 1525?F then cool rapidly to 1300?F and cool to 1200?F at no more than 20?F/h for 5 hours.
To harden heat to 1525?F and quench in oil. Temper as needed (minimum of 350?F).
Austempering at 1550?F and quench in a salt bath at 600?F and hold for 1 hr. Cool in air, no further tempering is needed.
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According to the Bethlehem book "Modern Steels - Handbook 3310" the following are APPROXIMATE Rockwell C hardnesses of oil quenched 5160 for various tempering temperatures:
SAE 5160
Temperature Hardness Temperature Hardness
400?F 59 Rc 900?F 42 Rc
500?F 57 Rc 1000?F 37 Rc
600?F 54 Rc 1100?F 32 Rc
700?F 52 Rc 1200?F 28 Rc
800?F 49 Rc 1300?F 20 Rc
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