Acero de herramienta D2 es un carbono alto, alto cromo, Acero de herramientas de endurecimiento del aire que se caracteriza por una dureza alcanzable relativamente alta y numerosos, grande, carburos de aleación ricos en cromo en la microestructura. Estos carburos proporcionan una buena resistencia al desgaste del contacto deslizante con otros metales y materiales abrasivos.. Aunque otros aceros con una dureza mejorada o una mejor resistencia al desgaste están disponibles, D2 proporciona una combinación efectiva de resistencia al desgaste y dureza, rendimiento de la herramienta, precio, y una amplia variedad de formularios de productos. También disponible como un electro-llag remel. (ESR) producto. El El proceso de remelitación proporciona una mejor homogeneidad química, Refinamiento del tamaño del carburo, y las mejoras asociadas en Propiedades mecánicas y de fatiga.
Aplicaciones: Rollos, golpes, muere por blanking, formación, guarnición, y rodando de hilo, cuchillos de corte, cuchillos de procesamiento de alimentos, and gauges.
D2/1.2379/Cr12MoV/SKD11 Chemical composition:
| C | Mn | Si | Cr | Mo | V |
| 1.4-1.6 | ＜0.6 | ＜0.6 | 11.5-13 | 0.7-1.2 | ＜1 |
Preheating: To minimize distortion and stresses in large or complex tools use a double preheat. Heat at a rate not exceeding 222°C per hour to 621-677°C equalize, then heat to 760-788°C. For normal tools, use only the second temperature range as a single preheating treatment. Austenitizing (High Heat): Heat slowly from the preheat. Furnace or Salt: 1010-1024°C.
Quenching: Air or pressurized gas to 66-51ºC. Sizes up to 4 pulgadas (101.6 mm) in thickness will through harden when air cooled from 857ºC. Sizes up to 6 pulgadas (152.4 mm) in thickness will through harden when air cooled from 885ºC.
Tempering: Temper immediately after quenching. Hold at temperature for 1 hour per inch (25.4 mm) of thickness, 2 hours minimum, then air cool to ambient temperature. The typical tempering range is 350 a 177 to 204ºC. For maximum wear resistance, temper between 149-177°C for a hardness of 62-64 HRC. For the optimal balance between wear resistance and toughness, temper between 260-288°C. This will produce 58-60 HRC. For maximum toughness, double temper, 2 hours plus 2 horas, at temperatures above 510°C. This will produce hardness of less than 58 HRC. To minimize internal stresses in cross sections greater than 6 pulgadas (152.4 mm) and to improve stability in tools that will be EDM’d after heat treatment, soaking times of 4 a 6 hours at the tempering temperature below 510°C are strongly recommended.
Annealing: Annealing must be performed after hot working and before re-hardening. Heat at a rate not exceeding 222°C per hour to 871-899°C, and hold at temperature for 1 hour per inch (25.4mm) of maximum thickness; 2 hours minimum. Then cool slowly with the furnace at a rate not exceeding 28°C per hour to 538°C. Continue cooling to ambient temperature in the furnace or in air. The resultant hardness should be a maximum of 255 HBW.
