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Charcoal Finery Iron: the South Wales Process, Ball Hammered into Stamps (Percy, 1864)
The best iron for charcoal tin-plates, as Percy watched it made at the Morfa Tin-plate Works, Llanelly, on 9 September 1859: pig iron melted under coke in a running-out fire flows into two charcoal fineries, where it is broken up with charcoal, melted down before a cold blast and worked into a ball, which is hammered into a slab and broken into 'stamps'.
Charcoal is used because it holds no sulphide of iron, so no sulphur passes into the iron.
Source: J. Percy, Metallurgy: Iron and Steel (1864), pp. 581-586. Picture: Fig. 107, the refinery and two charcoal fineries at Morfa.
Hejuru
Unknown
Amabwiriza
1
1
Melt the pig under coke
Melt the pig under coke
Melt Pembrokeshire pig iron and Cumberland haematite pig iron together under coke in the running-out fire (melting finery), enough to fill two charcoal fineries: 5 to 6 cwt at Pont-y-Mister; 200 to 250 lb for each finery at Pontypool. Tap it at the bottom so that metal flows first, and keep the slag apart as far as you can. Not given: the proportion of the two pigs.
Ibikoresho by'iyi ntambwe:
Ibice by'icyuma kitatunganyijwe1 5-6 cwt for two fineries
Amakara y'ubutare1 igiceIbikoresho bikenewe:
Itanura ryo gutunganya
Moteri ihuha umwuka2
2
Fill the charcoal fineries
Fill the charcoal fineries
Run the molten metal into the two charcoal fineries, still hot from the last heat. Take off the slag that comes with it as a crust once it has set. Throw in a basket of charcoal and let the cold blast on full.
Ibikoresho by'iyi ntambwe:
Amakara y'ibice (igiti gikomeye)1 a basket per finery, more as neededIbikoresho bikenewe:
Iziko ryo gutunganyaMoteri ihuha umwuka3
3
Break up and melt down
Break up and melt down
Break the friable, half-set metal with an iron bar, mix it with the charcoal and heap it towards the tuyere side, where it melts down before the blast ('sinking a lump'). Throw water on the charcoal at intervals so that it does not burn to waste. Keep loosening and raising the metal from the bottom and the tuyere side.
Ibikoresho bikenewe:
Icyuma cyo kuvugurura umuriroIziko ryo gutunganya
Amazi4
4
Gather the ball
Gather the ball
Put back pieces left from the last hammering with a two-pronged fork. Tap off the cinder several times and add charcoal, using the hooks at the sides as fulcra to press loose pieces down onto the ball. Lessen the blast at the end. At Morfa the metal went in at 2 h 10 m and the ball came out at 3 h 23 m.
Ibikoresho bikenewe:
Icyuma cyo kuvugurura umuriroIziko ryo gutunganya5
5
Hammer the ball into a slab
Hammer the ball into a slab
Put the ball under the cam hammer with the tuyere mark facing the hammerman. Hammer it into a narrow slab, rounded at the ends, about 1 3/4 to 2 1/4 in. thick. While it is hot, nick it across deeply in seven or eight places with a chisel-ended bar under the hammer.
Ibikoresho bikenewe:
Inyundo izamurwa ikagwa
Amakoro y'Umucuzi6
6
Quench and break into stamps
Quench and break into stamps
Plunge the nicked slab, still red-hot, into cold water to loosen the oxide. Lay it nicks down across a long ribbed anvil and break it with a narrow-ended sledge into 'stamps' of about 26 lb. Set the end pieces apart, sort the rest by soundness, and return broken bits to the next charge.
Ibikoresho bikenewe:
Amazi
Igitare cy'ubutare gisanzwe
Inyundo niniAmakoro y'UmucuziIbikoresho
3- 1 5-6 cwt for two fineriesUmwanya
- 1 igiceUmwanya
- 1 a basket per finery, more as neededUmwanya
Ibikoresho bikenewe
9- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
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Iki gishushanyo gikora
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