EN24 (817M40T) Engineering steel
EN24 (817M40T) is a very high strength steel alloy which is supplied hardened and tempered ideal for gears.
The grade is a nickel chromium molybdenum combination – this offers high tensile steel strength, with good ductility and wear resistance characteristics. With relatively good impact properties at low temperatures, EN24 is also suitable for a variety of raised temperature applications.
EN24 (817M40T) Engineering Steel is easy to treat and temper and is supplied hardened and tempered. The alloy offers a good combination of strength, ductility and wear resistance. It is a very high strength alloy engineering steel.
Steel stock range
High Peak Steels stock EN24 (817M40T) in round bar and also is available in forged block form that we can cold saw to size.
Associated standards
UK Standard EN24 | European Grades 34CrNiMo6 | Werkstoff 1.6565, 1.6582 | SAE/AISI 4340
EN24 (817M40T) Black
| Product | Min size | Max size |
|---|---|---|
 | 40mm dia | 400mm dia |
 | 20mm x 10mm | 900mm x 300mm |
 | 25mm | 150mm |
 |
EN24 (817M40T) Bright
| Product | Metric sizes Min | Max | Imperial sizes Min | Max |
|---|---|---|---|---|
| 10mm dia | 75mm dia | 1/2" dia | 3" dia |
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Chemical Composition
| C | Si | Mn | S | P | Cr | Ni | Mo | |
|---|---|---|---|---|---|---|---|---|
| Min | 0.36 | 0.1 | 0.45 | 1 | 1.3 | 0.2 | ||
| Max | 0.44 | 0.35 | 0.7 | 0.04 | 0.035 | 1.4 | 1.7 | 0.35 |
Mechanicals
| Yield N/mm2 | 0.2% proof N/mm2 | UTS (Rm) N/mm2 | Elong (A) % | Red of Area (Z) % | Hardness HB | Impact Test (KV) J |
|
|---|---|---|---|---|---|---|---|
| Quenched & Tempered to condition T (min) | 680 | 850 | 13 | 248 | 50 | ||
| Quenched & Tempered to condition T (max) | 1000 | 302 | |||||
| Quenched & Tempered to condition U (min) | 755 | 925 | 12 | 269 | 42 | ||
| Quenched & Tempered to condition U (max) | 1075 | 331 | |||||
| Quenched & Tempered to condition V (min) | 850 | 1000 | 12 | 293 | 42 | ||
| Quenched & Tempered to condition V (min) | 850 | 1150 | 12 | 293 | 42 | ||
| Drawn Quenched & Tempered to condition T (min) | 700 | 850 | 9 | 248 | 50 | ||
| Drawn Quenched & Tempered to condition T (max) | 1000 | 302 |
Typical applications
- High strength shafts
- Punches & dies
- Drill bushings
- Retaining rings
- Gears