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).
Results of Upton-Lewis tests on steel bars, comparing different heat treatments.
| Identifier | ExFiles\Box 154a\1\ scan0013 | |
| Date | 15th May 1915 | |
| COPY. To Wor.{Arthur Wormald - General Works Manager} for Hy.{Tom Haldenby - Plant Engineer} from R.{Sir Henry Royce} Copy to J.{Mr Johnson W.M.} " " Na.{Mr Nadin} R15/IB15515. May 15th.1915. Re Upton-Lewis Tests. With reference to the Upton-Lewis tests of narrow bars, namely .650" X .250", your comparison with mild steel which has had no heat treatment whatever is not particularly useful, because unless steel has been treated to make the best of it, we never know in an untreated condition whether it is in a good or bad state, and it may vary so immensely in its resistance to fracture. Generally speaking, if it is delivered from the works in small rolled bars, it is very good indeed. If such a bar had been reeled, it might be very poor. Anyway, the best heat treatment for the particular metal should always be given to it before using it in any way as a comparison. Referring to the test of the K.E.805, this does not show up to its usual superiority over the mild steel. This might be due to the narrower sample getting bent further. I think I should like to see this particular sample of .650" tested with the spring of second strength, so that the diagram is practically the same width. The K.E.805 seems to come out best with us with a Brinell hardness of about 330, which corresponds in most of the diagrams to 500°C. second heat. F.H.R. | ||