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Cast iron Sash window weights

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appletree:
Thanks for the replies, looks like they are worth having, I guess pre cut lengths could be put on the coal fire in the lounge to soften. Don’t know what it is love must have come in with the coal.
Don’t know what might happen to the carbon content?

Phil

Ray:
I have three about 18 inches long that I turned round.  Two looked good.  The other one has some holes and pits.  I have made model piston rings from one of the good ones and they worked well.  Some will be good and some will be bad.

vtsteam:
White heat? Uhhhh, nope, that's re-melting it. CI melts at 2200F.
For most gray irons, a ferritizing annealing temperature between 700 and 760°C (1300 and 1400°F) is recommended. If you're going by color that's dark red (see below).

You also don't have to keep it in a ramped powered furnace for cool down. just bury the piece in a bucket of wood ashes to cool slowly. In fact you can also do the heating to annealing temps in a wood fire in the brightly glowing embers with a little draft.

Color             Temperature [°C]     Temperature [°F]
                          From      To         From      To
Black red             426     593         799     1100
Very dark red      594     704        1100    1299
Dark red             705      814        1300     1497
Cherry red          815      870        1498    1598
Light cherry red  871      981         1599    1798
Orange               982     1092        1799    1998
Yellow                1093    1258        1999    2296
Yellow white      1259    1314         2297    2397
White                1315+                   2397+

krv3000:
 just a tip with the weights leve them  out to go rusty then machine them up in to bar stock then cote them in oil I have made lots of things out of the ones I have

NormanV:
I once bought a couple of flat irons in order to use the cast iron. They turned out to be a dissapointmant, not only were they chilled and had the handles cast into them, they also had a number of voids in the castings. I'll not bother again.

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