EN24T steel 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, its hardness is in the range 248/302 HB. EN24T can be further surface-hardened to create components with enhanced wear resistance by induction or nitriding processing.

We can supply EN24T from stock - Click for our EN24T stock list.

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 steel 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 Steel 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 steel is available from stock in round and flat bar and in plate.

Buy online:

EN24T Flats EN24T Squares EN24T Rounds Bespoke cut rounds

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

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

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Steel Express

Based in Wolverhampton, West Midlands, Steel Express are steel suppliers and stockholders. Stock is delivered on our own fleet of vehicles locally and nationally quickly and efficiently on the day we say we will.

We also provide a free issue cutting service, press braking, fabrication and forging.