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. 30, showing material properties against reheating temperatures.
| Identifier | ExFiles\Box 154a\1\ scan0279 | |
| Date | 16th May 1940 guessed | |
| TEMPERING GRAPH OF VIBRAC STEEL V.{VIENNA} 30 DIA. OF BAR: 1" HARDENING TEMPERATURE: 830°C QUENCHING MEDIUM: OIL COOLED, AFTER TEMPERING IN AIR. TONS PER SQUARE INCH - PERCENTAGES - FOOT-POUNDS - BRINELL IN UNITS OF TEN. MAXIMUM STRESS YIELD POINT BRINELL HARDNESS REDUCTION IN AREA % IZOD IMPACT ELONGATION % REHEATING TEMPERATURE - DEGREES CENTIGRADE. ACTUAL REHEATING TEMPERATURES OF TEST SAMPLES INDICATED BY * | ||