150. In 18-4-1 high speed steel, 18, 4 & 1 respectively denote the percentage of September 6, 2025 by Admin A. Chromium, tungsten & vanadium B. Tungsten, chromium & vanadium C. Tungsten, vanadium & chromium D. Tungsten, chromium & molybdenum ✅ The correct answer is option B.