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).
Tempering graph for Vibrac Steel V.45, showing various material properties against reheating temperatures.
| Identifier | ExFiles\Box 154a\1\ scan0278 | |
| Date | 16th May 1940 guessed | |
| 1312 TEMPERING GRAPH OF VIBRAC STEEL V.45 DIA. OF BAR: 1" HARDENING TEMPERATURE 830°C. QUENCHING MEDIUM: OIL COOLED, AFTER TEMPERING IN AIR. Y-AXIS: TONS PER SQUARE INCH - PERCENTAGES - FOOT- POUNDS - BRINELL IN UNITS OF TEN. X-AXIS: REHEATING TEMPERATURE - DEGREES CENTIGRADE. GRAPH LABELS: YIELD POINT, MAXIMUM STRESS, BRINELL HARDNESS, REDUCTION IN AREA %, ELONGATION %, IZOD IMPACT ACTUAL REHEATING TEMPERATURES OF TEST SAMPLES INDICATED BY * * | ||