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China H11 Mold steel

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China H11 Mold steel is a chromium-based steel alloy from the “H” family of steels according to the AISI classification system.It is one of the most commonly used alloys from this group, thanks to the outstanding impact toughness. Other steels from this group, such as the H13 have more vanadium, which gives better wear resistance and temper resistance, but worse impact toughness.

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Description of Steel

China H11 Mold steel is a chromium-based steel alloy from the “H” family of steels according to the AISI classification system. H11 is one of the most commonly used alloys from this group, thanks to the outstanding impact toughness. Other steels from this group, such as the H13 have more vanadium, which gives better wear resistance and temper resistance, but worse impact toughness.Thanks to these properties, Tool Steel H11 is mostly used in the aerospace industry, more precisely for the landing gear. This alloy is also widely used for helicopter rotor blades and shafts, as well as die-casting dies.

Tool Steel H11 is also used for hot tooling applications thanks to its excellent resistance to cracking, including thermal fatigue cracking, gross cracking and thermal shock during water cooling. These include hot punches, die casting dies, forging dies, hot shear blades, hot gripper dies, and extrusion tooling. Like most steels with high toughness and low carbon content, Steel H11 can be used for producing hot-work steels with the water-cooling method.

Chemical composition

C Si Mn P S Cr Mo Ni Cu V
0.38-0.43 0.8-1.0 0.2-0.4 ≤0.015 ≤0.015 4.75-5.25 1.20-1.40 ≤0.25 ≤0.35 0.4-0.6

Equivalent Grades of Steel

Germany Japan
DIN JIS
1.2343 SKD6

Mechanical properties of Steel

  • Tensile strength:1792 MPa
  • Tensile Strength, Yield:1482MPa
  • Elongation:8%
  • Modulus of elasticity: 207 GPa
  • Poisson’s ratio: 0.27-0.3

Application

  • helicopter shaft
  • Die casting mold
  • Extrusion die
  • Forging die

Heat treatment conditions

  • FORGING: H11 hot work steels are forged at 1121°C (2050°F). For this type of steels, forging below 899°C (1650°F) is not preferable.
  • ANNEALING: H11 hot work steels are annealed at 871°C (1600°F) and slowly cooled at 4°C (40°F) in the furnace.
  • HARDENING: Preheat to 1500 F and then heat to 1850 F and hold for 15 to 40 minutes. Air cool (air quench).
  • TEMPERING: Tempering is carried out on H11 tool steels at temperature ranging from 538 to 649°C (1000 to 1200°F) to obtain Rockwell C hardness of 54 to 38. Double tempering can also be performed in these steels every one hour at the preferred tempering temperature.

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