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).
Page detailing the properties and handling of 'Brimal' iron, including hardness and thermal conductivity.
| Identifier | ExFiles\Box 141\1\ scan0079 | |
| Date | 27th November 1935 guessed | |
| -2- The "Brimal" iron has a Brinell hardness of 179-195, but has a much greater tendency to work-harden, so that it is difficult to saw by hand. This initial ductility may give rise to dragging, and cause a distorted and work-hardened surface to form. If this happens, it might be worth while trying to work-harden the surface before use, say, by rolling with a hardened roller or ball. The thermal conductivity of "Brimal" also will be lower than that of ordinary cast irons. H1. HE Photomicrographs Nos. Al,312 - 22 and A759 and Al,156 att. | ||