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).
Cost analysis and comparison of steel ingots and billets for different nickel alloy specifications.
| Identifier | ExFiles\Box 144\4\ scan0035 | |
| Date | 7th March 1940 | |
| -2- Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation}9/MH.{M. Huckerby}7.3.40. COST FIGURES. As our supplies are in Billet form, only isolated examples are available for direct comparison with the ingot price. Firth's quoted in Sept.1939 for Ingots. Ex.1. S.67. (5% Nickel case hardening). = £26 - 7 - 6d. per ton. The equivalent billet price at that time = £36 - 3 - 6d. per ton. (size 3" sq. & upwards). --- EX.2. (our spec: ) S.69. (S/N). (2063 ) 3½% nickel = £21-4 - 6d. per ton. The equivalent Billet price at that time = £28-13 - 6d. per ton. (size 3" sq. & upwards). CONCLUSIONS. To bring the cost price to round figures, and taking the ingot price for average alloy steels as an average of £30 per ton for 775 tons = £23,250 /1,000 Merlins. --- To show how the Billet price increases as the process of forming them into workable bars proceeds, see attached sheet. Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation} | ||