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Tool-Steel Bar: Crucible Steel Drawn Out at a Cherry-Red Heat
Sheffield poured its crucible cast steel into octagonal or rectangular iron moulds and drew the ingots out into rods under the tilt hammer. That bar, eight-sided or square, was the stock for chisels, punches, files and blades. Andrew Ure's 1839 warning still holds: this steel must not go much above a cherry-red heat, or it turns brittle.
The picture: a water-driven tilt hammer at Abbeydale Industrial Hamlet, Sheffield.
Hejuru
A day at the forge
Amabwiriza
1
1
Heat gently to cherry red
Heat gently to cherry red
Bring the crucible-steel ingot up slowly in the forge to a cherry-red heat and no hotter. Ure: in its usual state cast steel will not bear much more without becoming brittle, and it will not take a welding heat.
Ibikoresho by'iyi ntambwe:
Icyuma gikomeye cy'isahani y'ishongesha2 kg
Amakara1 as requiredIbikoresho bikenewe:
Uruganda rw'umucuzi
Amafashi y'umucuzi
Uturindantoki two gukomeza ibyuma
Ikanzu y'uruhu
Amadarubindi y'umutekano2
2
Draw out a billet
Draw out a billet
On the anvil, with a striker on the sledge, draw the ingot out square, turning it a quarter after each pair of blows. Reheat as soon as the colour drops below red; never hammer it cold. Stop at a square billet of the size you need, or carry on drawing it flat into a rectangular bar for axe heads and picks.
Ibikoresho by'iyi ntambwe:
Amakara1 as requiredIbikoresho bikenewe:
Ingoyi
Inyundo nini
Inyundo ifite umutwe utambitseAmafashi y'umucuziUturindantoki two gukomeza ibyumaIkanzu y'uruhuAmadarubindi y'umutekano3
3
Knock the corners to an octagon
Knock the corners to an octagon
For octagon bar, set the square bar on a corner and hammer the four corners down evenly until all eight faces are equal, finishing in the matching groove of a swage block.
Ibikoresho bikenewe:
IngoyiInyundo ifite umutwe utambitse
Igiti cy'ibyuma gifite imyoboAmafashi y'umucuziUturindantoki two gukomeza ibyumaIkanzu y'uruhuAmadarubindi y'umutekano4
4
Check and cool slowly
Check and cool slowly
Check the size across the flats with a caliper, then let the bar cool slowly in the dying forge (our choice, to leave it soft for cutting and filing).
Ibikoresho bikenewe:
Ikigereranyo cya Digitale cy'Amasentimetero 6Uruganda rw'umucuziIbikoresho bikenewe
10- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
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