[SEL] UK Question

[Rob Skinner]

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originally used chiefly for making guns, but later superseded by  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.