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Compax Supreme Steel
Steel name: Compax Supreme
Diagram No.: 2757
AISI/SAE designation: D7
Chemical composition in weight %: 0.53% C, 0.30% Si, 0.70% Mn, max 0.005% S, 3.20% Cr, 1.50% Mo
Steel group: Tool steels
Properties: Compax Supreme is a chromium-molybdenum alloyed steel.
Applications: Uddeholm Compax Supreme has been developed as a mold quality steel, based on the widely used AISI S7 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. Uddeholm 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.
Reference: Not shown in this demo version.
Heat Treatment
Hardening: Preheating temperature: 1110–1290°F (600–700°C) Austenitizing temperature: 1690–1780°F (920– 970°C), but normally 1725°F (940°C).
Quenching media: Vacuum furnace with sufficient overpressure. Forced air or gas Martempering bath at 360-480°F (180– 250°C), then cool in air. Oil (large cross sections).
Note 1: Quenching in oil gives an increased risk for dimensional changes and cracks.
Note 2: Temper the tool as soon as its temperature reaches 120–160°F (50–70°C).
Tempering: Choose the tempering temperature according to the hardness required by reference to the tempering graph. Temper twice with intermediate cooling to room temperature. Lowest tempering temperature 360°F (180°C). Holding time at temperature minimum 2 hours.
Diagram note: No data.
Tempering Diagram
Price: 20.00 US $
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Disclaimer: The material data is a central depository of information based on global actual tests and calculated software data that is available to the public for a fee. The information and data presented herein are typical or average values and are not a guarantee of maximum or minimum values. Applications specifically suggested for material described herein are made solely for the purpose of illustration to enable the reader to make his own evaluation and are not intended as warranties, either express or implied, of fitness for these or other puposes. There is no representation that the recipient of this literature will receive updated editions as the become available.