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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).
Data sheet detailing the characteristics and applications of sandcast 'Hiduminium' R.R. 53 alloy.

Identifier  ExFiles\Box 116\2\  scan0124
Date  22th December 1939 guessed
  
Data Sheet No. 23

SANDCAST “HIDUMINIUM” R.R. 53

FROM the fact that R.R.53 was primarily developed for Die cast pistons, it is not generally known the enormous use that is available for sand cast purposes. This Data Sheet is issued with the object in view of stating the characteristics in the sand cast condition and giving particulars of some applications.

Sand Cast Aero-Engine Cylinder Head in R.R. 53.
Brake Shoes in R.R. 53.
Assorted Machine Levers

SPECIFIC GRAVITY ... 2.73
MELTING POINT ... 635°C.
HEAT CONDUCTIVITY ... 0°C.—100°C. 0.43 C.G.S. Units.
CO-EFFICIENT OF THERMAL EXPANSION ... 20°C.—100°C.=22.4 x 10⁻⁶.
SHRINKAGE ... 0.140 inches per foot=1/86 pattern scale=1.63%.
WOHLER FATIGUE. Sand Cast ±5.50 tons per sq. in. at 40 million reversals.
Chill ,, ±6.90 tons per sq. in. at 40 million reversals.
HEAT TREATMENT. Soak the castings at 530°C. ±5°C. for not less than two hours and quench in water at 70°C. to 100°C.
Age for 10 to 20 hours at 165°—175°C. and again quench in water. An alternative ageing treatment of two hours at 200°C. can be given, but this must be carefully regulated, and the time of bringing up to heat closely watched, according to the size and bulk of the castings.

TENSILE TESTS. Sand Cast Bars.
Shaped bars—cast 0.60 inches dia. on parallel portion and machined to 0.564 inches on 2 inch gauge length.

.1% Proof Stress.
Tons per sq. in.
Ultimate Stress.
Tons per sq. in.
Elongation % on 2”.
Brinell Hardness.
HEAT TREATED. 18 to 20.
20 to 23.
0.5 to 1.5.
129 to 138.

Bars cast 1 inch dia. and machined to 0.564 inches on 2 inch gauge length.

HEAT TREATED. Near Ul. Stress.
16 to 18.
0.5 to 1.5.
129 to 138.

Refer to Data Sheet No. 8 for Physical Properties of Chill Cast Bars.

HIGH DUTY ALLOYS LTD.
SLOUGH

Telephone : SLOUGH 21201 (6 lines)
Telegrams : “ALLOYS, SLOUGH”

P.T.O.
  
  


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