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From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Foundry tests and the chemical composition analysis of a cast iron Lincoln drum.

Identifier  ExFiles\Box 120\1\  scan0210
Date  3rd September 1937 guessed
  
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The tests made in our Foundry on bright and sealed specimens prepared in the laboratory showed greater freedom from blow-holes in the iron cast on the bright specimens.

This however requires further confirmation which should be obtained from the complete drum which has now been cast from existing patterns, and which has been handed to H.P.S. for machining.

The composition of the cast iron in the Lincoln drum is as follows :-

Total Carbon - 3.60%
Combined Carbon - 0.38%
Manganese - 0.63%
Silicon - 2.06%
Nickel - 0.25%
Phosphorus - 0.08%
Chromium - 0.19%
Copper - Nil.
Sulphur - 0.09%

The micro-structure confirmed the low phosphorus. The matrix was chiefly pearlitic.

The steel centre plate was a very low carbon mild steel with Brinell hardness 120.

The machined slot shown in the photograph 3062 C close to the edge of the steel plate is probably intended for brake adjustment, according to Mr. Martindale.

H1/E.J.W.
  
  


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