Steel grade EN24

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 black steel round bar and bright steel round bar . EN24 is also 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

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EN24 (817M40T) black steel

ProductMin sizeMax size
codes-round240mm dia500mm dia
codes-flat220mm x 10mm900mm x 300mm
codes-square225mm150mm
codes-hex2

EN24 (817M40T) bright mild steel

ProductMetric sizes
Min

Max
Imperial sizes
Min

Max
codes-round210mm dia75mm dia1/2" dia3" dia
codes-flat2
codes-square2
codes-hex2

EN24 (817M40T) Chemical Composition

 CSiMnSPCrNiMo
Min0.360.10.4511.30.2
Max0.440.350.70.040.0351.41.70.35

EN24 (817M40T) 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)
6808501324850
Quenched & Tempered to condition T (max)
1000302
Quenched & Tempered to condition U (min)
7559251226942
Quenched & Tempered to condition U (max)
1075331
Quenched & Tempered to condition V (min)85010001229342
Quenched & Tempered to condition V (min)85011501229342
Drawn Quenched & Tempered to condition T (min)700850924850
Drawn Quenched & Tempered to condition T (max)1000302

Typical Applications of EN24 steel

  • HIGH STRENGTH SHAFTS
  • PUNCHES & DIES
  • DRILL BUSHINGS
  • RETAINING RINGS
  • GEARS