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Specialty Compounds RTP Company

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
Applications:
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.

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Physical PropertiesMetricEnglishComments
Density 7.81 g/cc0.282 lb/in³hardened to 57 HRC
 7.70 g/cc
@Temperature 399 °C
0.278 lb/in³
@Temperature 750 °F
hardened to 57 HRC
 7.75 g/cc
@Temperature 199 °C
0.280 lb/in³
@Temperature 390 °F
hardened to 57 HRC
 
Mechanical PropertiesMetricEnglishComments
Hardness, Brinell 200200Soft annealed (Delivery condition)
Modulus of Elasticity 200 GPa29000 ksi(hardened to 57 HRC)
 179 GPa
@Temperature 399 °C
26000 ksi
@Temperature 750 °F
hardened to 57 HRC
 193 GPa
@Temperature 199 °C
28000 ksi
@Temperature 390 °F
hardened to 57 HRC
Compressive Yield Strength 1380 MPa200000 psi0.2%, hardened to 45 HRC
 1650 MPa239000 psi0.2%, hardened to 50 HRC
 2030 MPa294000 psi0.2%, hardened to 55 HRC
 2070 MPa300000 psi0.2%, hardened to 58 HRC
Charpy Impact 10.8 - 16.3 J8.00 - 12.0 ft-lbAustenitizing temp 1725°F, Tempering temp 400-1000°F
 
Thermal PropertiesMetricEnglishComments
CTE, linear  12.1 µm/m-°C
@Temperature 199 °C
6.70 µin/in-°F
@Temperature 390 °F
hardened to 57 HRC
 12.4 µm/m-°C
@Temperature 399 °C
6.90 µin/in-°F
@Temperature 750 °F
hardened to 57 HRC
Specific Heat Capacity 0.460 J/g-°C
@Temperature 20.0 °C
0.110 BTU/lb-°F
@Temperature 68.0 °F
hardened to 57 HRC
Thermal Conductivity  28.9 W/m-K
@Temperature 20.0 °C
201 BTU-in/hr-ft²-°F
@Temperature 68.0 °F
hardened to 57 HRC
 30.0 W/m-K
@Temperature 199 °C
208 BTU-in/hr-ft²-°F
@Temperature 390 °F
hardened to 57 HRC
 31.0 W/m-K
@Temperature 399 °C
215 BTU-in/hr-ft²-°F
@Temperature 750 °F
hardened to 57 HRC
 
Component Elements PropertiesMetricEnglishComments
Carbon, C 0.53 %0.53 %
Chromium, Cr 3.2 %3.2 %
Iron, Fe 93.77 %93.77 %As Balance
Manganese, Mn 0.70 %0.70 %
Molybdenum, Mo 1.5 %1.5 %
Silicon, Si 0.30 %0.30 %
Sulfur, S <= 0.0050 %<= 0.0050 %

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