Project Description

EN8/080M40 carbon steel is a British grade as per BS 970 standard.It has medium carbon content with 0.36-0.44% which gives it medium tensile strength.EN8 steel is generally supplied in untreated condition or normalized condition.For further process,it can be flame or induction hardened to produce a good surface hardness(50-55HRC) and moderate wear resistance.EN8 materials in its heat treated forms possesses good homogenous metallurgical structures, giving stable machining properties,so it can be easily machined  in any condition.

EN8 forged round bar

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1.Supply Form & Size & Tolerance

Hot Forged round bar:Φ130-Φ1000mm,Length:3000-10000mm

Flat bar/Blcoks:Thickness :120-800mm xWidth:120-1500mm,Length:2000-6000mm

Surface FinishBlack-Forged Black-Rolled Turned   GrindingPolishedPeeledCold Drawn
Tolerance(0,+5mm)(0,+1mm)(0,+3mm)Best h9Best h11Best H11Best H11

2.Chemical Composition

EN8/080M400.36-0.440.1-0.40.60-1.0≤ 0.05≤ 0.05

3.Relevant Standards


4. Mechanical Property

Ruling Section,mm2546520
Tensile Strength,Mpa510-540620-770690-850
Yield Strength,Mpa≥ 245≥385≥465
ISO V Impact,J203333

5.Forging EN8/080M40 steel

Forging temperature around 1050℃,but don’t forge below  950℃,EN8 steel should be cooled as slowly as possible in still air(may get fine grain) or in sand after forged.

6.Heat Treatment

  • Normalizing

Heat the steel to the temperature 830-860ºC ,keep the temperature depend on the steel size, then followed by cooling in still air.

  • Annealing

Heat EN8 steel  slowly to 680-710°C, keep the temperature stable . Cool slowly in the furnace.

  •  Hardening

Hardening of this grade is carried out from an austenitizing temperature of 820-860ºC followed by oil or water quenching.

  •  Tempering

Carbon steel EN8 or 080m40 can be tempered at a heat of between 550°C to 660°C,heating for about 1 hour for every inch of thickness, then cool in oil or water.


EN8 steel is widely used in industries which is used in applications where better properties than mild steel are required.

Typical Applications:

  • Automotive parts
  • Connecting rods
  • Studs, bolts
  • Axles, spindles
  • General engineering components
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