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).
Letter to High Duty Alloys Ltd. concerning magnesium loss in A.C.9 alloy during remelting.
| Identifier | ExFiles\Box 115\5\ scan0130 | |
| Date | 2nd August 1938 | |
| COPY. Experimental Dept. Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation}2/JH. 2nd. August 1938. High Duty Alloys Ltd., Buckingham Avenue, Trading Estate, Slough, BUCKS. For the attention of Mr.Richards. Dear Sirs, With reference to our recent conversation at your works concerning A.C.9 alloy. I have taken up the matter with our Laboratory re loss of magnesium after subsequent remelting of A.C.9 and the following may be of interest to you, although I do not know whether this information will be new to you. Firstly; it is agreed that there is a loss of magnesium after a remelt, and it is our standard practice to add 1½ ozs. magnesium per 100 lbs. melt, for each remelt. Secondly; an alternative would be to increase the magnesium content to 1.1% in the initial mix, as in a case say where it is known that Wellworthy's have to remelt once to produce bearings. It would seem that this point has some bearing on the degree of hardness to be obtained with this material, and I shall be very interested to hear your further comments. It is understood, of course, that heat treatment still stands at two periods of 12 hours each at 180°C. Thanking you once again for the interesting time spent at your works, and please give my regards to Mr.Herrington. Yours faithfully, for ROLLS-ROYCE LTD. | ||