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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).
Comparing different types of steel used for road spring materials by various suppliers.

Identifier  ExFiles\Box 54\3\  Scan192
Date  1st March 1927
  
Confidential

Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer} from ROY.{Sir Henry Royce}

[Handwritten] X2628

ROY{Sir Henry Royce}4/MG2.3.27

[Handwritten, struck through] Valve
[Typed, struck through] Road [Typed] Spring Material

Up to the latter part of 1924 Woodhead used Silico Chrome Steel, and then changed over to Silico Manganese. Chart "A" gives typical details of the latter.

Firths use Chrome Vanadium Steel for our Springs, produced in an Electric Furnace, which gives properties, after rolling and annealing, as Chart "B" (attached) the figures shown being the mean of some 13 casts.

Lemoine has used Silico Manganese Steel with an elastic Elongation of .008, and this material was employed in the manufacture of the trial Springs they delivered to us early last year. I have no further data as to its actual composition or physical properties - in fact I found Lemoine, when we were discussing supplies, very chary of disclosing same.

I believe Lemoine's excellence is due to:-

(a) His Heat Treatment
(b) His method of grinding
(c) Detailed attention to the production of his Steel, step by step, from the Billet onwards.

ENCLOSURES. 2 Charts, marked "A" and "B".

[Stamp] ENCLOSURE Nº 632 "JUSTSO"
[Stamp] ENCLOSURE Nº 633 "JUSTSO"
  
  


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