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).
Comparative test results of various metal alloys.
| Identifier | ExFiles\Box 76\3\ scan0067 | |
| Date | 19th July 1918 | |
| July 19, 1918. To R.{Sir Henry Royce} from HCH. c. EH. H1/P19718. Mr Hives has informed me that it is thought possible that certain parts previously in steel or copper-base alloys may be required to be changed over to a high tensile aluminium alloy. Under these considerations it is desirable to have comparative test results on some of the available alloys, as compared with gun metal etc. [TABLE START] Alloy Type | H.T. | A metal similar to H metal, more ductility than the first. (H.T.) | Crankcase Alloy. | Gun Metal. | Phosphor Bronze. --- | --- | --- | --- | --- | --- Composition | | | | | Copper. | 4.5 to 5.2 | 5.6 to 6.2 | 1.5 to 2.0 | | Zinc. | 7.5 to 9 | 1.3 to 2 | 9 to 12 | | Nickel. | 1.1 to 1.4 | .9 to 1.2 | nil. | | Iron. | .5 to .8 | .5 to .8 | .5 to .8 | | Manganese | .15 to .25 | .15 to .25 | nil to .15 | | Magnesium | | | | | Properties | | | | | M.S. | 14.5 | 13.6 | 9 | 16.6 | 18.3 Y.P. | 13.1 | 11.3 | 7.3 | 10.8 | 14.7 ELONG. | 2% | 6.0 | 3.2 to 3 | 6.8 | 3.6 R.A. | 2.5 | 7.3 | 3% | 5.5 | 4 Brinell. | | | | | (Chill. | 110 to 140. | 78 to 96 | 80 to 114. | 110 to 138. | 101 to 121. (Sand cast) | 92 to 114. | 66 to 82 | 66 to 92. | 80 to 110. | 80 to 98. Stanton. | | | | | .312 drop. | 11,000. | 750. | 2600. | 5800. | 3200. [TABLE END] [Handwritten note next to Gun Metal and Phosphor Bronze columns]: good quality material going through works The tensile results above were made on the sand cast bars. To find the approximate chill cast test result, 15% should be added to the H.T. figures, 20% to the H metal figures and 30% to the crankcase metal figures. [Handwritten notes at bottom]: A metal similar to H metal, more... GUN Met... Phosphor Bronze [Signature]: HCH | ||