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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).
Steel specifications for gun barrels, referencing U.S. Arsenal practices and cancelling further inquiries.

Identifier  ExFiles\Box 170\4\  img039
Date  30th August 1940
  
ROLLS-ROYCE
INC.

TELEPHONES
TRINITY 2-1135 & 2-1136

ROOM 2-261
GENERAL MOTORS BUILDING
DETROIT, MICHIGAN

OY 6/D/Aug.30.40
Serial No. 209

13

August 30, 1940

File

Rolls-Royce, Ltd.
Derby, England

Gun Barrels

Rm.{William Robotham - Chief Engineer}

Attached copy of note from Lessells contains following information:

U.S. Arsenal uses for barrels a chrome molybdenum vanadium steel which is not any S.A.E. standard, but is rather like S.A.E. 6130 with added molybdenum.

Arsenal will accept open-hearth steel provided the macroetch shows good results.

Transverse tensile tests are specified.

S.A.E. 4140 used for rifle barrels.

4140 will machine better at a given Brinell than the straight carbon steel suggested in your last paragraph.

I believe you will not want us to go further in getting material prices for gun steel in view of Hs.{Lord Ernest Hives - Chair}' cable of August 21 -

"....Cancel inquiries on gun parts."

OY

Copies to: BN{W.O. Bentley / Mr Barrington}
LR{Mr Ellor}
Ringholz
  
  


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