Metallurgical Base

What is difference between EN24 and EN8 steel?

About En8 steel(080M40):

Medium strength steel that is suitable where good all-round performance is required. En8 steel has better quality than EN3 but with the drawback of machinability.

Machining: Achieving a fine finish is more difficult because the material tends to ‘rip’, especially evident during fine pitch dry screw cutting. Plenty of high oil content lubricant is recommended. Final polishing is very likely required to gain a fine finish though will never quite look as bright as EN3. Welding is very easy and achieves a strong joint.

Common uses: Hydraulic rams (chromed), key steel, medium torque shafts, medium bending and compression loading applications. Good corrosion resistance. Material bends considerably before failure.

Not suitable for: High shock loads as the material tends to shear under extreme conditions. This steel also not suitable for high bending forces.

(also raed about Why En-8 steel is suitable for various applications?)

EN24 steel(817M40):

Very high strength steel that is easy to through heat treat and temper with minimum surface scaling.

Machining: Tough to machine, especially with HSS. The use of carbide is recommended – though chip breaking is easily achieved with moderate tool feeds. Easy to produce a high quality surface finish to high tolerances and higher surface speeds can be used on final cuts. Best roughed out at a slower speed but higher feed then finished with high speed and moderate feeds. It can be machined when hardened with stainless grade tips or ceramics.

(Also read about An Introduction about heat treatment process)

Common uses: Used for the production of punches and dies because of its hardenability, drill bushings, bearings surfaces, high strength shafts, gears, hubs, screws and fixings.

Not suitable for: Shock shear loading is more limited than EN19 to EN16 because failure will be more likely to occur in shear loads. Cracking and distortion can occur during heat treatment so sharp edges should be rounded where possible.

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What is difference between EN8 and EN24 steels:

EN8: It is a steel grade which has 0.4% carbon and 0.8% of manganese.
Application: En 8 finds wide varieties of application not only for Forging, casting, Connecting rods, axel shaft and crank shaft but also used for low cost die Material in tool and die making industries. This material can be tempered and hardened to provide a greater strength and wear resistance in comparison in low carbon steels.  

EN24: It is steel which has Ni-Cr-Mo as an alloying element. It has 0.36-0.44% carbon.  EN24 is most suitable for the manufacture of parts such as shafts, gears, bolts, heavy-duty axles and studs. EN24 is capable of retaining good impact values at low temperatures. EN 24 is generally used in the volume hardened condition. It gives higher toughness than the EN8 steel. EN24 grade of steel exhibited better corrosion resistance than EN8.

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Conclusion: In this article, you read about the what is difference between En24 and En8 steel. Thank you for reading this article hope it may help you to understand about it. And visit for more article related to bio materialselectronic materialsadvance materials,  magnetic materials and metallurgical based.

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K Yashdeep

Hye there..! I am Yashdeep Kamal. I completed my Bachelor in Technology(Materials Science and Metallurgical Engineering). Engineer by passion, writer by choice. I have been writing about Composites, Ceramics, polymers, nanotechnology, advance materials and metallurgy etc. You can read about these topics here. Hope it may help you.

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