Coil Springs Question

A

arjuna70

Joined
Mar 19, 2010
Messages
23
I just picked up a couple car coil springs that I wanted to use to make some knives. I was wondering what you do about heat treating when dealing with this type of metal. Unfortunately, I have no idea what kind of car they came from if this matters. Thanks for the help.
 
About your only good bet is A) have a piece professionally tested... or B) forge and test... start 1475-1500ºF and work up in 25ºF and 5 minute soak time increments until you get satisfactory results...


Jason
 
The simplest way to deal with coil springs from modern cars is to work it as if it was 5160. It could be many alloys, but the forging and HT specs for 5160 will cover most all of them.

Forge hot around starting at 2200F and stopping at 1600F. Do not forge below this temp.
Normalize at 1600F
Austenitize at 1525F with a 5 minute soak.
Quench in oil ( most any oil will work for 5160).
Temper at 400F for two hours,cool to room temperature and repeat.
 
bladsmth said:
Forge hot around starting at 2200F and stopping at 1600F. Do not forge below this temp.
Normalize at 1600F
Austenitize at 1525F with a 5 minute soak.
Quench in oil ( most any oil will work for 5160).
Temper at 400F for two hours,cool to room temperature and repeat.
Click to expand...

Thanks so much. I'm on it. Nothing like free steel. I really would like to make it work.
 
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