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).
Physical and mechanical properties of the alloy 'Hiduminium' R.R. 59.
| Identifier | ExFiles\Box 116\2\ scan0131 | |
| Date | 22th December 1939 guessed | |
| Physical Properties of "HIDUMINIUM" R.R. 59 SPECIFIC GRAVITY . . . . . . . . . . . 2.75 CO-EFFICIENT OF THERMAL EXPANSION—20—100° C. . . . 22.0 x 10⁻⁶ 20—200° C. . . . 23.1 x 10⁻⁶ 20—300° C. . . . 24.0 x 10⁻⁶ 20—400° C. . . . 24.8 x 10⁻⁶ THERMAL CONDUCTIVITY 0—100° C. C.G.S. UNITS . . . 0.428 " AS A PERCENTAGE OF COPPER . . 46.5 MECHANICAL PROPERTIES OF HEAT TREATED FORGINGS | | Stampings and Pressings | Large Hand Forgings | |---|---|---| | FATIGUE LIMIT AT 40,000,000 REVERSALS | Tons per sq. in. | ± 10.3 | — | | ULTIMATE STRESS IN TENSION.. | .. " " | 26—28 | 23—26 | | 0.1% PROOF STRESS IN TENSION | .. " " | 20—22 | 19—21 | | ELONGATION % IN 2 in. . . | .. .. " " | 6—12 | 3—5 | | 0.1% PROOF STRESS IN COMPRESSION | " " | 21—23 | — | | 0.5% " " | " " | 25—27 | — | | BRINELL HARDNESS NUMBER . . | .. .. .. | 124—148 | — | PROPERTIES AT ELEVATED TEMPERATURES | Temperature | Ult. Stress Tons/Sq. in. | Brinell at Temperature | Brinell after Cooling | |---|---|---|---| | 20° C. | 28.0 | 134 | — | | 200° C. | 21.5 | 110 | 134 | | 250° C. | 19.5 | 87 | 125 | | 300° C. | 13.0 | 52 | 90 | | 350° C. | 8.0 | 27 | 75 | | 400° C. | | 12 | 70 | BRITISH STANDARD SPECIFICATION L.42. | ||