[SEL] UK Question

[Dave Croft]

----- Original Message ----- 
From: "Rob Skinner" <rskinner at rustyiron.com>
To: "The SEL email discussion list" <sel at lists.stationary-engine.com>
Sent: Wednesday, April 18, 2007 5:08 PM
Subject: Re: [SEL] UK Question



On Apr 18, 2007, at 7:50 AM, Jim and Diane wrote:

> Can somebody please tell me an American translation for silver
> steel and
> gunmetal?


Silver Steel:
TYPICAL ANALYSIS:

C. Si. Cr. Mn.
1.00% 0.30% 0.40% 0.35%
Silver Steel is a 1% carbon tool steel supplied centreless ground to
close tolerances. Available in 1, 2 or 3 metre lengths. Non standard
sizes can be produced to your specific requirements.

Hardening: Heat to 770/790°C and thoroughly soak. Quench into well
agitated water or preferably a 10% brine solution.

Tempering: Heat uniformly and thoroughly at the selected tempering
temperatures and hold for at least one hour. For your guidance refer
to our colour charts for forging, hardening and tempering.

Tempering °C 150 200 250 300
HRC 64/66 62/64 60/58 54/56

Gunmetal:

Gunmetal is a kind of bronze, an alloy of copper, tin, and some zinc,
originally used chiefly for making guns, but later superseded by
steel. It is also called red brass in America.
Gunmetals produced for different purposes vary slightly in
composition. In some cases, the alloy may be composed only from
copper and tin, or from copper, tin, and lead. It has many uses in
industry, and is used for statues and various small objects, e.g.
buttons.
U.S. Government bronze spec. G is a gunmetal composed of 88% copper,
10% tin, and 2% zinc. U.S. Government bronze spec. H is composed of
83% copper, 14% tin, 3% zinc, and 0.8% phosphorus.
Gunmetal can also mean steel treated to simulate gunmetal bronze.
Gunmetal is also a name for a shade of grey colour.




I put the question on the UK model engineers group & here are the responses.
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Silver steel is drill rod in american, for gunmetal try looking for
"government bronze", link here
http://www.bartleby.com/65/gu/gunmetal.html
Peter
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Silver steel is "drill rod" in US-English. Drill rod being of a bit better
quality than silver steel.
Nick
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Gunmetal is "red brass"
Michael
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Dave Croft
Warrington
http://oldengine.org/members/croft/
http://community.webshots.com/user/crftdv