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 1100?/850? Celsius
  • Anneal at a temperature of 760? Celsius, soaking for four hours after reaching temperature
  • Normalising is not applicable
  • Hardening by oil quench at a temperature of 820?/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 :

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.

  • Cities we Supply our EN24 (817M40) to :

    Agartala, Agra, Agra Rampur, Ahmedabad, Aizawl, Ajmer, Aligarh, Allahabad, Alwar, Amaravati, Ambala, Ambattur, Ambernath, Amravati, Amritsar, Aurangabad, Bangalore, Bareilly, Belgaum, Bhagalpur, Bhavnagar, Bhilai, Bhiwandi, Bhopal, Bhubaneswar, Bidhannagar, Biharsharif, Bikaner, Bilaspur, Bokaro, Chandigarh, Chennai, Chittoor, Coimbatore, Cuttack, Dahod, Davanegere, Dehradun, Delhi, Dhanbad, Dharamsala, Dindigul, Diu, Durgapur, Mumbai, Lucknow, Coimbatore, Imphal, Mysore, Ratlam, Delhi, Kanpur, Darjeeling, Jalandhar, Nagpur, Solapur, Kolkata, Allahabad, Dehradun, Jammu, Nashik, Srinagar, Chennai, Ahmedabad, Faridabad, Jamshedpur, Bhadravati, Chattisgarh, Durgapur, Asansol, Hospet, Bellary, Visakhapatnam, Nellore, Surat, Bangalore, Chandigarh, Ghaziabad, Jhansi, Patna, Siliguri, Hyderabad, Amritsar, Noida, Kochi (Cochin), Mangalore, Indore, Vadodra, Bhubaneswar, Bikaner, Bhavnagar, Tirupur, Ankleshwar, Warangal, Agartala, Thoothukudi, Thiruvanthapuram, Jaipur, Aizawl, Guwahati, Kozhikode, Raipur, Vishakhapatnam, Jabalpur, Bhopal, Gwalior, Ludhiana, Rajahmundry, Thane, Agra, Bhubaneshwar, Gurgaon, Madurai, Rajkot, Varanasi, Bhilai, Haridwar, Meerut, Ranchi, Ahmednagar, Akola, Amravati, Aurangabad, Baramati, Beed, Bhandara, Bhiwandi, Buldhana, Chandrapur, Chimur, Dahanu, Dhule, Dindori, Erandol, Gadchiroli, Hatkanangle, Hingoli, Ichalkaranji, Jalgaon, Jalna, Karad, Khed, Yavatmal, Kolaba, Kolhapur, Kopargaon, Latur, Malegaon, Mumbai, Nagpur, Nanded, Nandurbar, Nashik, Osmanabad, Pandharpur, Parbhani, Rajapur, Ramtek, Ratnagiri, Raver, Sangli, Satara, Shirdi, Shirur, Solapur, Thane, Wardha, Washim, Andhra Pradesh, Jammu and Kashmir, Nagaland, Uttarakhand, Haryana, Lakshadweep, Arunachal Pradesh, Jharkhand, Odisha, West Bengal, Himachal Pradesh, Assam, Karnataka, Punjab, Andaman and Nicobar Islands, Puducherry, Bihar, Kerala, Rajasthan, Chandigarh, Meghalaya, Chhattisgarh, Madhya Pradesh, Sikkim, Dadar and Nagar Haveli, Mizoram, Goa, Maharashtra, Tamil Nadu, Daman and Diu, Tripura, Gujarat, Manipur, Telangana, Delhi, Uttar Pradesh in India, Faridabad, Fatehpur, Gandhidham, Gandhinagar, Ghaziabad, Greater Hyderabad, Greater Mumbai, Greater Warangal, Gurgaon, Guwahati, Gwalior, Haldia, Howrah, Hubballi-Dharwad, Hyderabad, Imphal, Indore, Jabalpur, Jaipur, Jalandhar, Jammu, Jamnagar, Jamshedpur, Jhansi, Jodhpur, Junagadh, Kakinada, Kalyan-Dombivali, Kanpur, Karnal, Kavaratti, Kochi, Kohima, Kolhapur, Kolkata, Kota, Lucknow, Ludhiana, Madurai, Mehsana, Mangalore, Mangaluru, Mira-Bhayandar, Moradabad, Morbi, Mumbai, Muzaffarpur, Mysore, Nagpur, Namchi, Nasik, Navi Mumbai, NDMC, Nellore, New Delhi, New Town Kolkata, Noida, Oulgaret, Pali, Panaji, Panipat, Panvel, Pasighat, Patiala, Patna, Pimpri-Chinchwad, Port Blair, Puducherry, Pune, Raipur, Rajkot, Ranchi, Raurkela, Industrial Township, Rourkela, Sagar, Salem, Satna, Secunderabad, Shaharanpur, Shillong, Siliguri, Silvassa, Solapur, Srinagar, Surat, Thane, Thanjavur, Thiruvananthapuram, Thoothukudi, Thrissur, Tiruchirapalli, Tirunelveli, Tirupur, Tumkur, Udaipur, Ujjain, Ulhasnagar, Vadodara, Vapi, Varanasi, Vasai-Virar, Vellore, Vishakhapatnam.

    Countries we Export our EN24 (817M40) to :

    United States of America, Malaysia, UAE, Indonesia, Saudi Arabia, Iran, Qatar, India, China, United Kingdom, Singapore, Canada, Thailand, South Korea, Turkey, Philippines, Egypt, Germany, Italy, Japan, Russia, Vietnam, Australia, South Africa, Portugal, Morocco, Costa Rica, Kazakhstan, Netherlands, Mexico, Brazil, France, Spain, Taiwan, Nigeria, Bangladesh, Kuwait, Iraq, Ukraine, Poland, Jordan, Romania, Oman, Hong Kong, Venezuela, Colombia, Norway, Chile, Trinidad & Tobago, Greece, Czechia, Belgium, Sri Lanka, Cyprus, Angola, Myanmar (Burma), United Kingdom, Canada, South Korea, Thailand, Netherlands, Spain, Turkey, Australia, Mexico, Pakistan, Vietnam, Brazil, Philippines, France, Taiwan, Poland, South Africa, Russia, Nigeria, Kuwait, Norway, Romania, Egypt, Oman, Sweden, Belgium, Hong Kong, Israel, Colombia, Switzerland, Denmark, Finland, Argentina, Venezuela, Peru, Ukraine, Chile, Bangladesh, Portugal, Ireland, Austria, Algeria, Greece, Iraq, New Zealand, Slovakia, Hungary, Kazakhstan, Slovenia, Lithuania, Serbia, Sri Lanka, Bahrain, Bulgaria, Morocco, Tunisia, Croatia, Jordan, Ecuador, Trinidad & Tobago, Estonia, Azerbaijan, Ghana, Lebanon, Cyprus, Dominican Republic, Latvia, Libya, Costa Rica, Cambodia, Macedonia (FYROM), Belarus, Jamaica, Palestine, Turkmenistan, Afghanistan, Bahrain, Costa Rica, Egypt, Iraq, Jordan, South Korea, Kazakhstan, Sri Lanka, Lithuania, Norway, Oman, Philippines, Poland, Qatar, Russia, Vietnam, South Africa, Nigeria, Mexico, Turkey, Hungary, Algeria, Angola, Argentina, Austria, Azerbaijan, Bangladesh, Belarus, Belgium, Bhutan, Bolivia, Bulgaria, Croatia, Czech Republic, Estonia, Finland, Greece, Italy, Japan, Libya, Romania, Thailand, Trinidad & Tobago, Tunisia, Ukraine, Yemen, Hong Kong, Gabon, China, Portugal, Switzerland, New Zealand, Sweden, Slovakia, Kenya, Lebanon, Morocco, Mongolia, India, United States, United Arab Emirates, Canada, Pakistan, Peru, Chile, Spain, France, United Kingdom, Indonesia, Israel, Iran, Kuwait, Mexico, Malaysia, Nigeria, Serbia, Singapore, Taiwan, Chile, Venezuela, Ecuador, Saudi Arabia, Netherlands, Brazil, Colombia, Ghana, Iran, Denmark, Poland, Australia.