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Tin Bronze Ingots, Wire and Rod
Bronze is copper alloyed with tin. Bronze Age smiths used about 10 % tin for castings and a softer 'mild' bronze of about 6 % tin that they hammered into sheet; modern bronze is about 88 % copper and 12 % tin. It melts at about 950 °C, depending on the mix. Melt the copper, stir in the tin, pour ingots; for wire and rod, use the 6 % alloy and draw it like copper, annealing often.
Intermediate
A day
Instructions
1
1
Weigh the charge
Weigh the charge
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2
2
Melt the copper
Melt the copper
Melt the weighed copper in a crucible in the charcoal forge with the air on, under a layer of charcoal to keep the air off the metal.
Materials for this step:
Copper940 g
Charcoal - Lump10 kgTools needed:
Blacksmith Forge
Clay Crucible - Refractory
Weighing Scale
Leather Apron
Welding Gloves
Safety Glasses3
3
Add the tin
Add the tin
Push the weighed tin under the melt with a dry iron rod and stir it in.
Materials for this step:
Tin60 gTools needed:
Crucible Tongs4
4
Pour ingots
Pour ingots
Lift the crucible with the tongs and pour into a warmed, dry ingot mould. Let it cool.
Tools needed:
Crucible Tongs
Ingot Mould5
5
Hammer and draw
Hammer and draw
Anneal a 6 % ingot at a dull red and quench, hammer it round, taper the end, and draw it through the drawplate with wax, annealing every two holes. Stop at rod or go on to wire.
Materials for this step:
Beeswax10 g
Water5 litersTools needed:
Anvil
Ball Peen Hammer
Propane Torch
Fire Brick
Blacksmith Tongs
Quench Bucket
File Set
Steel Drawplate
Draw Tongs
Bench Vise6
6
Measure
Measure
Measure the rod or wire and label it with its tin percentage.
Tools needed:
Digital Caliper 6-Inch7
7
Troubleshooting
Troubleshooting
Bronze troubleshooting.
Flow
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Materials
5- 940 gPlaceholder
- 10 kgPlaceholder
- 60 gPlaceholder
- 10 gPlaceholder
- 5 litersPlaceholder
Tools Required
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