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).
Data sheet for 'Hiduminium' R.R. 53.C high strength sand and die casting alloy.
| Identifier | ExFiles\Box 116\2\ scan0128 | |
| Date | 22th December 1939 guessed | |
| Data Sheet No. 36. (Superseding Data Sheet No. 26) “HIDUMINIUM” R.R. 53.C. (D.T.D. 309 & D.T.D. 313) (Superseding R.R. 53 B.) HIGH STRENGTH SAND AND DIE CASTING ALLOY “HIDUMINIUM” R.R.53.C is a high tensile sand and die-casting alloy which has been developed from the well-tried alloys R.R.50 and R.R.53.B, which latter alloy it now supersedes, and combines the exceptionally good casting properties of the former with the high tensile properties and ductility of the latter. Its fluidity in the molten state is such that it can be cast in very intricate forms, while its strength and “feeding” qualities through the solidification range considerably reduce any risk of solidification cracks and porosity hitherto encountered in high tensile casting alloys when cast in intricate forms. When solid it has strength and ductility superior to R.R.53.B enabling it to be quenched after solution treatment without fear of cracking caused by uneven contraction of various sections, hence even with complicated castings the highest tensile properties may be obtained. It is not, however, recommended for use in parts subject to temperatures above 200°C. such as pistons and air-cooled cylinder heads. In this field, R.R.53 is still considered to be superior. The solution treatment of R.R.53.C consists of a heating period of 2—6 hours at 530° followed by a quench. The ageing treatment is carried out at 165°C for a period of 15—20 hours. After this latter treatment it may either be quenched or allowed to cool in air. HIGH DUTY ALLOYS LTD. SLOUGH Telephone : SLOUGH 21201 (6 lines) Telegrams : “ALLOYS, SLOUGH” P.T.O. | ||