EN24/AISI 4340
Tool Steel
EN24 steel is a medium carbon, low alloy steel known for its toughness and strength in generally large sections. EN24 is likewise one kind of nickel chromium molybdenum steels. It can be supplied hardened and tempered in the tensile range of 930-1080 Mpa as well as annealed condition. Pre hardened and tempered EN24 steels can be further surface hardened by flame or induction hardening and by nitriding. The EN24 steel has great shock and impact resistance as well as wear and abrasion resistance in the hardened condition. EN24 steel is high tensile alloy steel famous for its excellent wear resistance properties and in addition to where high strength properties are required. This Grade is used in components affiliated to shafts, gears, studs and bolts. Its hardness is within the range of 248-302 NB. It might be further surface-hardened to make additional with more advantageous wear resistance by means of induction or nitriding processing.
STEEL PROPERTIES
- Standard high-speed steel grade
- Contains well-balanced alloy composition
- High toughness
- Great cutting edge retention
APPLICATIONS
Basically utilized in all metal-cutting tools for roughing or finishing such as twist drills, thread dies, diverse milling cutters, reamers, broaches, circular saw segments, countersinks, thread chasers, shaping tools and woodworking tools. Also highly suitable for cold-forming tools such as cold extrusion rams and dies, as well as cutting and precision cutting tools, plastic moulds with elevated wear resistance and screws.
Physical properties
| 20°C | 300°C | |
|---|---|---|
| Thermal Conductivity at °C | 20 | 300 |
| W / (WIC) | 40.5 | 36.5 |
Heat Treatment
| Soft Annealing °C | Cooling | Hardness HI3 | Stress-relief Annealing °C | 1st Pre-Heating °D | 2nd and 3rd | Hardening °C | Quenching | Tempering °C | Hardness after Temperature HRC |
|---|---|---|---|---|---|---|---|---|---|
| 650-700 | Slowly | max. 280 | 630-650 | Furnace | up to approx. 400 in an air-circulating furnace | 780 and 1000 | 1190-1230 | at least twice 530-560 | 64-66 |