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source of bronze

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Luker11/03/2021 14:07:43
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Posted by noel shelley on 11/03/2021 13:36:09:

Hi Luke, I wondered if you would stay silent or join the fun ! Knowing of the issues in your neck of the woods was my reason for stating "in the UK"! The preoccupation with precise alloys and industrial standards is hardly relavent in our scales, so long as it is safe and works does it matter ? If it has 2%Zn, 0.3%Ni, 3% Pb, 8% Sn If any of the whole numbers vary by 1 or2 % does it make any significant difference ? If you make your own alloys you only know what you started with not what you have in the end, most notebly a loss of Zn. For bronzes, which is where this started, it can be bought in ingot form, 7Kg and £9 per Kg =£56 +vat and carriage! Tin £30/Kg

Or buy off cuts and smelt. Best wishes Noel.

Yep I agree. Nice thing about having limited recourses is it forces innovation. Fuming was a problem in my furnace; I originally designed it for melting cast iron. My capping mix pretty much solved that (If I remember correctly I did send you the recipe, did you give it a bash?). I know you’ve mentioned to me before to use a pyrometer but the thermocouple and sleeve is a little expensive here. I have found that after my first pour I’m normally spot on with the pouring temperature based on time and the metal dipping bar. Most alloys are specified as a range, I mix based on mid-range with the Zn, and Si at the upper end with the tests I’ve done very close to “spec”.

You guys are lucky with the ingot price, that’s what the scrap merchants here want for brass!

Nigel Graham 215/03/2021 22:54:43
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Reminds of a gem in one of my ancient engineering text-books I've collected. It is a recipe for cast-iron suitable for good-quality machine bases, etc., so it says. It goes something like this:

1 ton of Lowmoor Iron,

2 tons xxxx iron

3 tons yyyy iron,

[The adjectives are the ore quarry names],

Plus...

... 1 ton of best selected scrap.

QA at its best, eh?

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