Hot work tool steel
Hot-work steels are alloyed tool steels for purposes where the surface temperature of the tool can be up to 400 ° C during use. With regard to their heat resistance, they are between cold work steel (up to 200 ° C) and high speed steel , which can be used up to 600 ° C. They obtain their high wear resistance through a hardening treatment and their high heat resistance through subsequent tempering , during which secondary carbides are precipitated and residual austenite is converted into martensite when it cools .
The tensile strength is between 900 MPa and 2000 MPa. When forging, the forming temperature can be between 800 ° C and 1150 ° C.
Alloy elements
In addition to carbon , the following alloying elements can be included:
The alloying elements are coordinated in such a way that the hot-work tool steels have, in addition to sufficient hardness and strength , high hot strength, hot hardness and wear resistance at elevated temperatures.
use
Hot-work steels are mainly processed into dies for closed- die forging , tools for die-casting and extrusion, or into injection-molding tools. They are quenched in oil or water.
Example materials
- 55NiCrMoV6
- 55NiCrMoV7 forging dies, hot shear blades
- X60WCrMoV9-4 hot punch, hot extrusion mandrel
Individual evidence
- ↑ Skolau (Ed.): Maschinenbau , Springer, 2014, p. 540.
- ↑ König, Klocke: Manufacturing Process 4 - Forming , Springer, 5th Edition, 2006, p. 101.
- ↑ Fritz, Schulze: Fertigungstechnik Springer, 11th edition, p. 75.
- ^ König, Klocke: Manufacturing process 1 - turning, milling, drilling , Springer, 8th edition, 2008, p. 108.
- ↑ König, Klocke: Manufacturing Process 4 - Forming , Springer, 5th Edition, 2006, p. 106.
- ↑ Skolau (Ed.): Maschinenbau , Springer, 2014, p. 367.
- ↑ König, Klocke: Manufacturing Process 4 - Forming , Springer, 5th Edition, 2006, p. 108.