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What annealing temperature?

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Andrew Tinsley05/07/2020 16:08:26
1148 forum posts

I have a pair of ratchet crimping tools for crimping car battery leads amongst other things. (so they are hefty!)

The ratchet pawl has snapped across the hole that it rotates about. As usual, no manufacturers spares are available. The pawl is almost certainly made from 1/8" gauge plate and then hardened.. The break is a clean fracture, so the gauge plate has been hardened with perhaps little or no tempering "let down".

I can easily make another pawl or two and I have a small furnace to harden and if necessary, temper the end product Any suggestions for a tempering temperature.? Or should I just harden them without any further heat treatment? The way the pawl has snapped seems to suggest a very hard and brittle condition.

Thanks,

Andrew.

elanman05/07/2020 21:30:42
31 forum posts
3 photos

Well I would temper to Mid to dark straw. Sorry I'm old school I don't know what temperature that is. Others may have different ideas.

Cheers

John

Clive Hartland05/07/2020 22:36:42
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2574 forum posts
40 photos

As it is a pawl only the end needs hardening and tempering. heat and harde, dress off clean and then place on a hot steel block and let the colours run and as soon as dark straw reaches the tip dunk in cold water

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