H21/1.2581
Tool Steel
Tool and Die Steel Includes Cold Work Steel, Hot Work Steel, Plastic Mould Steel, High Speed Steel. These tool materials adhere to great quality demands of steel like temper, strength, toughness, resistance to tempering, hardening capacity, dimensional stability etc. The range of Tool Steel in our store includes products from renowned manufacturers.
Characteristics
Tungsten-chrome–vanadium steel for hardening in oil and possibly in air with very good hardenability, very high firmness during the heat and resistance to the tempering, high resistance to the hot tempering and good toughness. Further the steel has a lower resistance to tearing of thermal fatigue and higher sensitivity to quick changes of temperature. The steel is not appropriate for tools cooled by water. It is well-workable during the heat and well-workable in the soft-annealed state.
Suitability
For tools for hot mechanical working such as highly stressed small pressing dies and die inserts especially for die forging of accurate products from the difficult-workable steels and copper alloys, thorns and jaws for forging presses, forgings for swaging, tools for production of rivets, nuts and screws, small extrusion dies (matrixes), thorns, pressing discs for extrusion of alloys of non-ferrous metals. Further the firm and movable parts of molds, core and other small and highly stressed parts of molds for pressure casting of copper alloys can be made from the steel. Tools for hot cutting such as highly stressed small shear blades, punching dies, small trimming dies
Comparable standards
Chemical composition (typical; in weight %)
| C | Si | Mn | P(Max) | S(Max) | Ci |
|---|---|---|---|---|---|
| 0.25-0.35 | 0.10-0.40 | 0.15-0.45 | 0.035 | 0.035 | 2.50-3.20 |
Heat treatment of steel W.Nr. 1.2581
| Way | Temperature [°C] | Procedure |
|---|---|---|
| Forging | 900-1150 | Cool bigger and difficult-shape tools in air or in thermal bath at the temperature of 500 – 550 °C |
| Soft annealing | 750-800 | Warm few hours (according to the size of object), mostly four hours are enough and cool slowly in the furnace |
| Annealing to lower tension | 600-650 | Warm 1 to 2 hours and cool slowly in the furnace |
| Hardening | 1100-1150 | Cool in oil to the temperature of about 100 °C |
| Hardening | 1120-1170 | Cool bigger and difficult-shape tools in air or in thermal bath at the temperature of 500 – 550 °C |
| Tempering | 550-650 | Cool in air, the degree of tempering is set by hardness and toughness of instrument according to the tempering chart |
Note