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).
Translated letter from Aubert & Duval regarding the hardness testing of a Bentley B.6.BN crankshaft after nitriding treatment.
| Identifier | ExFiles\Box 146\3\ scan0279 | |
| Date | 24th December 1936 | |
| TRANSLATION ET.30.12.36 Messrs.AUBERT & DUVAL Aciéries des Ancizes 6, Rue Henri vuillemin, GENEVILLIERS. To Franco-Britannic Autos Ltd., 12, Avenue George V, P A R I S VIII. 24th December, 1936. Dear Sirs, Re: BENTLEY CHASSIS B.6.BN{W.O. Bentley / Mr Barrington} We are in receipt of your letter of the 23rd instant concerning the crankshaft which you sent us for treatment after rectification of the journals. We verified the journals for hardness after re-nitriding and found them to correspond to 570/585 Vickers/Brinell. We also verified a portion of the crankshaft previous to our re-nitriding and found the hardness to be 536. We consider the above figures to be normal for the composition of the metal as indicated by you and the re-nitriding will increase the resistance to wear. Our personal opinion, however, is that the alloy used, as per the formula contained in your letter of the 4th instant, is not very favourable and that very much more satisfactory results might be obtained by modifying it. This fact, by the way, was brought to the notice of British Manufacturers a few years ago, by the NITRALLOY Company, which deals with all re-nitriding matters in Great Britain. Believe us etc... Sgd. AUBERT | ||