View single post by Craustin1
 Posted: Tue Apr 17th, 2012 12:50 am
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Craustin1

 

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 My point was that at some point it's still splitting hairs. Has anyone tested the Panerai Bronze to see what the chemical break up of that is? I doubt it's SWISS bronze. Same thing with a lot of the stainless steel watches we have, there are differences in china metals as those sourced from US Steel plants. At some point this just becomes an argument in futility; those that want to buy a Bronze watch for $600, $800, or $1500 probably know its a compromise from one costing $10,000 or $20,000 in several ways. That does not mean you get less enjoyment from that piece around your wrist. Lum-Tec has a Bronze watch coming out too, they have announced they have their own blend of CuSn8, are they the next to be flamed? crap.gif

oagaspar wrote: Craustin1 wrote: Here is the Chemical composition of CuSn8:
Chemical Composition:
Sn: 7.50-8.50%
P:  0.03-0.35%
Zn: 0.20% Max.
Fe: 0.10% Max.
Pb: 0.05% Max.
Zn: Balance
CuSn8 - UNS.C52100 Phosphor Bronze Alloys, which is a 8% tin bronze distinguished by a very good combination of strength and electrical conductivity. It is used for connector and current-carrying springs in contacts. Among the 4-8% tin bronze C52100 exhibits the lowest electrical conductivity, the highest reachable strength is significantly higher than C51100 and C51000 and C51900. By means of an additional further tempering after the cold forming process the bendability can be further improved.
In addition, it has better corrosion resistance and good sliding properties. C52100 is used for springy components and sliding elements when increased strength and wear-resistance are required.

From what I read, in general most Bronze is defined by being a metal alloy, with it's primary composition that of Copper... CuSn8 would then be also a copper alloy. I think we are now just splitting hairs..


Craustin,if you are going to google,google correctly...you left out the company name for your info... ALB Copper Alloys Co., Ltd. Xiamen, China Tel: +86-592-5631276 Fax: +86-592-5750151 Email:Lindy.Chen AT alb-copperalloys.com Please visit our website:http://www.alb-copperalloys.com...CHINA aka Chinese Bronze which all the other companies who revealed the bronze indiscretion to begin with had in their watches/Benarus/Helson/Zenton...brass because of the zinc in it...Roland is claiming Germany! and this is the composition of true CuSn8 bronze...
Cu : 91,5
P : 0,2
Sn : 8,5
and even purer it would be 8% tin and 92% copper...
once you start adding anything else to the mix it is a copper alloy!