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EN24T Steel Properties

EN24T / 817m40. EN24 is usually supplied in the T condition with a tensile strength of 850/1000 N/mm2.

EN24T is a popular grade of through-hardening alloy steel due to its excellent machinability in the "T" condition. EN24T is used in components such as gears, shafts, studs and bolts. EN24T can be further surface-hardened to create components with enhanced wear resistance by induction or nitriding processing.

Click for EN24T stock

International Steel Specification Comparison (EN24T)

BS 970:1955 EN24T
BS 970:1991 817M40T
German / DIN 34CrNiMo6
French AFNOR 35NCD6
American AISI / SAE 4340
German Werkstoff No. 1.6582
European Standard EN10277-5

 

817M40T - EN24T is a high tensile alloy steel renown for its wear resistance properties and also where high strength properties are required. EN24T is used in components subject to high stress and with a large cross section. This can include aircraft, automotive and general engineering applications for example propeller or gear shafts, connecting rods, aircraft landing gear components.

Typical chemical composition of En24T

C

SI

MN

S

P

Cr

Mo

Ni

0.36/0.44

0.10/0.35

0.45/0.70

0.040 max

0.035 max

1.00/1.40

0.20/0.35

1.30/1.70

817M40T / EN24T Mechanical Properties

Size
mm

Tensile
Strength
N/mm²

Yield
Stress
N/mm²

Elongation

Impact
Izod J

Impact
KCV J

Hardness
HB

63 to 150

850-1000

680 Min

13%

54

50

248/302

150 to 250

850-1000

654 Min

13%

40

35

248/302

Convert hardness to Rockwell B, Rockwell C or Vickers.

 

Hardening EN24: Heat uniformly to 823/850°C until heated through. Quench in oil.

Tempering:  Heat uniformly and thoroughly at the selected tempering temperature, up to 660°C and hold at heat for two hours per inch of  total thickness.
Tempering between 250-375°C in not recommended as this can seriously reduce the steels impact value.

Stress Relieving: Heat slowly to 650-670°C, soak well. Cool the EN24 tool in a furnace or in air.

EN24T is available from stock in round and flat bar and in plate.

Click here for Steel hardness conversion charts and heat treatment hardness tables

Other engineering steel grades: En1A, En3B, En8, En9, En14, En16, En19, En24, EN24T, En36

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