H11 Tool Steel – Frequently Asked Questions
H11 tool steel is a chromium‑molybdenum‑vanadium hot work tool steel designed for high‑temperature strength, toughness, and thermal fatigue resistance. • Carbon: 0.33–0.43% • Chromium: 4.75–5.50% • Molybdenum: 1.10–1.60% • Vanadium: 0.30–0.60% • Silicon: 0.80–1.20% • Manganese: 0.20–0.50% This composition provides excellent hot hardness, toughness, and heat resistance.
H13 tool steel offers better wear resistance, while H11 tool steel provides better toughness and impact resistance.
Yes, H11 tool steel can be used for cold work where high toughness is required.
YH11 tool steel maintains hardness and strength up to 540–600°C, making it ideal for hot forging, die casting, and extrusion tooling.
H11 tool steel offers excellent thermal fatigue resistance and resists heat checking during repeated heating and cooling cycles.
H11 tool steel has thermal conductivity of approximately 24–28 W/(m·K), helping reduce heat buildup and improve tool life.
H11 tool steel is typically hardened at 995–1040°C followed by air or gas quenching.
H11 tool steel can be air quenched, gas quenched, or oil quenched depending on section size.
• Hot work applications: 540–650°C • Low temperature applications: 150–175°C Double or triple tempering is recommended for best performance.
Anneal H11 tool steel at 845–900°C, then slow furnace cool to 480°C before air cooling.
Yes, preheating reduces distortion and improves heat treatment results.
H11 tool steel is widely used in hot work and high‑strength applications including: • Hot forging dies • Die casting dies • Extrusion tooling • Aerospace components • Shear blades • Plastic molds • Defense components
Yes, H11 tool steel is commonly used in aerospace components such as landing gear, shafts, and structural parts.
