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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).
Tensile and hardness test results for heat-treated sand and chill castings at elevated temperatures.

Identifier  ExFiles\Box 116\2\  scan0125
Date  22th December 1939 guessed
  
TENSILE STRENGTH AT ELEVATED TEMPERATURES. HEAT TREATED.
Temp. of Test. | Ultimate Stress. Tons per sq. in.
NORMAL. | 18.50
200°C. | 16.00
250°C. | 13.90
300°C. | 13.00
350°C. | 7.80
Refer to Data Sheet No. 14 for Chill Cast figures.

BRINELL HARDNESS AT ELEVATED TEMPERATURES. HEAT TREATED.
Temp. of Test. | Hardness No. | Recovery Value After Cooling.
NORMAL. | 129 | —
100°C. | 117 | 129
150°C. | 107 | 129
200°C. | 101 | 129
250°C. | 78 | 121
300°C. | 50 | 101
350°C. | 27 | 70
Refer to Data Sheet No. 14 for Chill Cast figures.

TENSILE TEST PIECES TAKEN FROM ACTUAL SAND CASTINGS. HEAT TREATED.
BRAKE SHOE CASTING.
Figure 1.
Position | Ultimate Stress. Tons per sq. in. | Elonga-tion % | Brinell Hardness
1. | 18.20 | 0.5 | 148
2. | 22.50 | 2.0 | 138
3. | 22.40 | 0.5 | 148
4. | 16.50 | 2.0 | 138
5. | 16.75 | 2.0 | 138
6. | 17.50 | 2.0 | 138

LEVER CASTINGS. HEAT TREATED.
3 Test Pieces taken from different parts of each casting.
Figure 2.
Position 1. 18.75 1.0 138
2. 21.00 1.0 138
3. 19.00 1.0 138
Figure 3.
Position 1. 19.00 1.0 129
2. 20.50 1.0 129
3. 21.50 1.0 129

Figure 1.
Figure 2.
Figure 3.
P.T.O.
  
  


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