EN24 (817M40)

EN24 Round Bar / 817M40T Steel

 

EN24 Round Bars, Rods & Flats

 

EN24 also Known as 817M40 is high tensile alloy steel famed for its wear resistance properties and in addition where high strength properties are required.

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.

817M40T - EN24T steel is high tensile alloy steel renowned 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, shafts, studs and bolts aircraft landing gear components.

In addition to the above, EN24T is capable of retaining good impact values at low temperatures, hence it is frequently specified for harsh offshore applications such as hydraulic bolt tensioners and shipborne mechanical handling equipment.

EN24 sections larger than 250mm may still be available in the quenched and tempered condition, but it should be noted that a fall-off in mechanical properties may be apparent approaching the centre of the bar.

It is therefore recommended that larger sizes are supplied in the annealed (softened) condition, and that quenching and tempering is carried out after initial stock removal.  This should achieve better mechanical properties towards the core.

 

Form of Supply :

“Presinox Impex” are stockholders and suppliers of EN24 / EN24T Flat, Round, Square and plates. Squares, flats and diameters can be sawn cut to your required sizes. Diameters in EN24 / EN24T are available bright drawn and black hot rolled. EN24T can be sawn to your required lengths as one offs or multiple cut pieces.

Ground steel bar can be supplied, providing a high tensile engineering steel precision ground bar to tight tolerances.

Contact our experienced sales team who will assist you with your EN24 alloy steel enquiry.

• Round
• Square
• Flat
• Plate
• Hex

 

Applications of EN24 / EN24T / 817M40 :

EN24 was originally introduced for use in the motor vehicle and machine tool industries for gears, pinions, shafts, spindles and the like. Later its applications became much more extended. Suitable to produce parts for such as locomotives, cranes, rolling mills, coal cutting machinery etc. where good strength and fatigue resistance is called for. Other applications for EN24 and EN24T are found in die casting and hot metal working, such as die bolsters, racks and pinions, angle pins for pressure die casting, hot stamping dies for aluminums stamping, die beds for steel stamping, lower temperature nut, bolt and rivet heading dies, large section drop forging dies. It is widely used in the plastic and rubber molding industries for moulds (particularly rubber moulds), hob retaining rings, patens, retaining rings for built up moulds, stop pins for moulds. For moulds EN24 is normally supplies hardened and tempered to ‘T’ condition. If a higher hardness is desired EN24T should be annealed and then heat treated to the required hardness.

 

Working and Heat Treatment:

• Forging within the temperature range 1100⁰/850⁰ Celsius
• Anneal at a temperature of 760⁰ Celsius, soaking for four hours after reaching temperature
• Normalising is not applicable
• Hardening by oil quench at a temperature of 820⁰/850 Celsius after soaking through

 

Typical Applications:

• High strength shafts
• Punches & dies
• Drill bushings
• Retaining rings
• Gears

 

EN24 Equivalents :

BS970: 1955	EN24 / EN24T
BS970/PD970: 1970 onwards	817M40 / 817M40T
European	34CrNiMo6
Werkstoff No.	1.6582
US SAE (AISI)	4340
Din	40NiCrMo84
French AFNOR	35NCD6
European Standard	EN10277-5
SAE (AISI)	9850
Werkstoff No.	1.6565

 

 

Mechanical Properties or Conditions for EN24:

Conditions	Annealed	S	T	U	V	W	X	Y	Z
Ruling Section (mm)	250	250	250	100	65	30	30	30	30
Tensile Strength (MPa)	620	680/770	850/1000	930/1080	1000/1160	1080/1240	1235 (Min)	1540 (Min)	1540 (Min)
Yield Stress (MPa)	410	480	635	740	835	925	1005	1130	1130
Elongation (% Min)	16	16	12	12	12	11	10	5	5
ISO V Impact (Joule)	30	32	40.7	47.5	47.5	40.7	34	30	10
Hardness (Brinell)	180/220	223/277	248/302	269/321	293/341	311/375	341/388	363/415	444 (Min)
Proof Stress (0.2%) if required (MPa, Min)		550	630	710	770	850	910	990	1235

Note: Interestingly, the impact values do not alter between condition “U” and condition “V”.

EN24 Conditions S	EN24 Conditions W
EN24 Conditions T	EN24 Conditions X
EN24 Conditions U	EN24 Conditions Y
EN24 Conditions V	EN24 Conditions Z

EN24 Can Be Heat Treated to make the material in the above Conditions according to the requirement of the Client or Customers.

 

Standard Stock Sizes in the As Rolled or Normalized Conditions :

SIZE	SIZE	SIZE	SIZE
20	70	130	230
25	75	140	240
30	80	150	250
35	85	160	280
40	90	170	305
45	95	180	330
50	100	190	350
55	108	200
60	115	210
65	120	220

 

“Presinox Impex” is the biggest & leading Supplier & Stockiest of EN24 in India.

EN24 / EN24T flat bar and round bar steel stockholders and suppliers, delivering to the whole of the India.

You can Email us at This email address is being protected from spambots. You need JavaScript enabled to view it. for any requirement or inquiry.