CarTech Micro-Melt 23 Steel

Steel name: Micro-Melt 23
Diagram No.: 2305
Chemical composition in weight %: 1.30% C, 0.35% Si, 0.30% Mn, 4.20% Cr, 5.00% Mo, 3.10% V, 6.30% W
Steel group: PM high speed tool steels
Properties: CarTech Micro-Melt 23 alloy is a general-purpose powder high speed tool steel possessing an excellent combination of wear resistance, toughness, and strength. Additional benefits of the alloy are low distortion in heat treat and good grindability. Typical working hardness range is HRC 62-66.
Applications: CarTech Micro-Melt 23 alloy may be considered for many types of tooling applications where a combination of good abrasion resistance, toughness, and temper resistance are required. In addition, it may be considered for cold working applications because of its combination of abrasion resistance and compressive strength. Finally, because of its low distortion during heat treatment, it may be considered for tools of complicated design.
Reference: Not shown in this demo version.

Heat Treatment
Hardening: A two-stage preheat is recommended as part of the hardening procedure. Preheat at 840/930°F (449/499°C), transfer to a second preheat at 1560/1650°F (849/899°C). Austenitize at 2000/2175°F (1093/1190°C), depending upon final hardness/toughness combination desired. When hardening in vacuum, the austenitizing temperature should be raised approximately 20/25°F (11/14°C) above that used for a salt bath. Parts may be air, oil, vacuum, or salt quenched. For oil quenching, an interrupted quench is recommended. Parts should be oil quenched to approximately 1000°F (538°C), removed from the bath, and air cooled. Similarly, parts may be quenched into a salt bath held at 1000°F (538°C), equalized, and air cooled. Vacuum furnaces with positive pressure quench capability can also be used. Parts should be allowed to cool to below 150°F (66°C) prior to tempering.
Tempering: Tools should be tempered immediately after the completion of the quench. The tempering temperature may be varied according to the desired hardness, but is usually in the range 1000/1075°F (538/579°C). A triple temper is desired to ensure the elimination of excessive retained austenite. Each temper should be at least 1 hour at temperature, with parts cooled to room temperature between tempers. The hardness values for various austenitizing/tempering temperature combinations can be found in the Typical Mechanical Properties section of this data sheet.
Diagram note: No data

Effect Tempering Temperature on Hardness

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