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Master Bond adhesives
Bohler-Uddeholm COMPAX™ AISI S7 MOLD QUALITY Cold Work Steel
Categories: Metal; Ferrous Metal; Alloy Steel; Tool Steel; Cold Work Steel

Material Notes: Chromium-molybdenum alloyed steel

A versatile S7 grade recommended for applications demanding a high degree of toughness and moderate wear resistance. Successfully used for heavy-duty punching and shearing tools. Also for hardened back-up plates and punch die holders.

Compax Supreme is characterized by:

  • High toughness
  • Good wear resistance
  • High impact resistance
  • Good through hardening properties
  • Good machinability
  • Excellent polishability
  • Good dimensional stability during hardening
MOLDS FOR PLASTICS-Compax Supreme has been developed as a mold quality steel, based on the widely used AISI S-7 grade. The steel is extremely clean and has a homogeneous microstructure. These features are achieved through strict processing control and maximum sulfur content of 0.005%. This quality level is verified by ultrasonic testing to high requirements. The result is a steel that machines consistently, is predictable in heat treatment and can be polished to extremely high surface finishes. Further, the toughness of the steel is enhanced, for greater performance security and increased tool life. By holding the carbon content to the high end of the carbon range a consistent hardness is assured, important in molds with larger cross-sections. Compax Supreme is manufactured in the form of hot rolled and forged bars with a machined, decarbfree finish, with plus tolerances to allow finishing at a nominal inch size, where required.
TOOLS FOR METAL STAMPING-Compax Supreme is also suitable for a wide range of heavy duty blanking, shearing and forming tools, due to its excellent combination of toughness and wear resistance. Its relatively high carbon content makes the achievement of the maximum recommended working hardness of 58 HRC easier to achieve in larger cross sections.
BLANKING AND SHEARING-Tools for: Blanking, punching, cropping, shearing, trimming, Shear blades(cold), Shredding knives, Shear blades(hot, Circular shears, and Trimming Tools for forgings
FORMING-Coining dies(cold), Cold extrusion dies, punches, Tube and section forming rolls; plain rolls, Cold heading tools, and Master hobs for cold hobbing.

Available Properties
  • Density, hardened to 57 HRC
  • Density, hardened to 57 HRC
  • Density, hardened to 57 HRC
  • Hardness, Brinell, Soft annealed (Delivery condition)
  • Modulus of Elasticity, (hardened to 57 HRC)
  • Modulus of Elasticity, hardened to 57 HRC
  • Modulus of Elasticity, hardened to 57 HRC
  • Compressive Yield Strength, 0.2%, hardened to 45 HRC
  • Compressive Yield Strength, 0.2%, hardened to 50 HRC
  • Compressive Yield Strength, 0.2%, hardened to 55 HRC
  • Compressive Yield Strength, 0.2%, hardened to 58 HRC
  • Charpy Impact, Austenitizing temp 1725°F, Tempering temp 400-1000°F
  • CTE, linear, hardened to 57 HRC
  • CTE, linear, hardened to 57 HRC
  • Specific Heat Capacity, hardened to 57 HRC
  • Thermal Conductivity, hardened to 57 HRC
  • Thermal Conductivity, hardened to 57 HRC
  • Thermal Conductivity, hardened to 57 HRC
  • Carbon, C
  • Chromium, Cr
  • Iron, Fe, As Balance
  • Manganese, Mn
  • Molybdenum, Mo
  • Silicon, Si
  • Sulfur, S
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