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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).
Analysis report on a fractured road spring, detailing its chemical composition and Brinell hardness tests.

Identifier  ExFiles\Box 38\1\  Scan045
Date  11th August 1919
  
Contd. -2- EH2/LG11.8.19.

to be in a very crystalline condition. Below is Mr. Hall's report:-

RE FRACTURED ROAD SPRING.

Analysis.

Carbon .72%
Manganese .42
Chromium .57
Phosphorus .037
Silicon. .50 (approx).

The brinell hardness was found to vary considerably on opposite sides of the leaf, thus close to the point of fracture it was 404 on one side and 477 on the other. The Brinell hardness falls off rapidly towards the end.

The fracture was very crystalline as one might expect from the high carbon in the material; it was also irregular as if the hardening had not been satisfactory.

EH.
  
  


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