Main Spring

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LRB

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Working on a lock that goes on a trade pistol made by Curly Gostomski. Anybody know what steel he used for the main spring? It is a cast spring. Had to spread the arms a tad for more power. Now need to re-heat treat.
 

ohio ramrod

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I don't know what steel he used, but most steels will harden when heated to the point a magnet won't stick then oil quenched. Tempering temp is more specific to the steel. For springs I like to use the melted lead method . :idunno:
 

jerrywh

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I have no idea what he uses but I harden and temper at the same temps no matter what steel is in the spring. If that doesn't work then he used a inferior steel and the spring needs to be replaced.
1550° to harden. 725 to 750 for 20 minutes to temper. always works.
 

LRB

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Thanks Jerry. I went with 1500° with a short soak time to harden, double temper at 740°, 1 hr each. Seems to be good.
 
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