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  #121  
Old 01-02-2011, 08:05 PM
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I appreciate the 'general' advice from all - problem is I have a blade from a file and no idea what the steel is ...
However - if it does turn nasty - I do have a FGYT blade to make me feel better!
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  #122  
Old 01-02-2011, 09:32 PM
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Quote:
Originally Posted by tel View Post
I appreciate the 'general' advice from all - problem is I have a blade from a file and no idea what the steel is ...
With unknown steel you need to establish that it will harden (i.e. has a high enough carbon content and is not mild steel) :-
A good first step is to heat until none magnetic (red) then heat for a further 30 - 45 seconds more, then quench immediately.
Do not allow the steel to cool prior to quenching.
Quench nose down straight in, (Not at a side angle)
Quench for around 30 seconds to be safe.

With a regular file try and file the tang gently, if hardened the file will literally skate off the steel, it will sound almost brittle, if so, it has quench hardened.
If it is still soft it is probably scrap.

If it hardened as per above, as soon as possible temper it at 275c for around 20mins, allow to cool, then test the tang with the same file, does the file leave a mark i.e. does it feel softer.
If it does you will probably have a reasonable user.

Cheers
Tom
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Last edited by Tom; 01-02-2011 at 09:36 PM.
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  #123  
Old 01-02-2011, 09:34 PM
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Hi.

This is my setup, just thermalight blocks loose stacked, and heated with a roofers propane torch.
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  #124  
Old 01-02-2011, 09:40 PM
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Hi.

This is my setup, just thermalight blocks loose stacked, and heated with a roofers propane torch.
need a bigger bottle that one is already freezing up
if you put the sides closer and put a half block across the bottom but allow a gap it will take less gas to heat up and act more like a oven

ATB

Duncan
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  #125  
Old 01-02-2011, 09:48 PM
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Thanks Duncan for the advice about making the "oven" area smaller, the bottle was not the only thing freezing up that day.
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  #126  
Old 21-03-2011, 04:49 AM
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so what do rockwell c scales go for on your side of the pond??
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