EN 8

Grade Introduction:

EN8 is an unalloyed medium carbon steel grade with reasonable tensile strength. It is normally supplied in cold-drawn or as-rolled conditions. EN8 is widely used for applications that require better properties than mild steel but does not justify the costs of alloy steel. EN8 can be flame or induction hardened to produce a good surface hardness with moderate wear resistance. EN8 is available from stock in the bar and can be cut to your requirements. We also offer flame cut plates cut to your required sizes. EN8 plates can be supplied surface ground or precision ground.

Grade Application:

EN8 steel material is suitable for all general engineering applications requiring a higher strength than mild steel such as:

• general-purpose axles

• shafts,

• gears,

• bolts and studs.

• spindles,

• automotive and general engineering components,

• other general engineering parts etc.

Equivalent grades:

  • • BS 970-1991:080M40
  • • AISI/ASTM A29:1038, 1040, 1045
  • • DIN Werkstoff No.: 1.0511, 1.1186, 1.1189
  • • BS & DIN European: C40, CK40, C45, CK45
  • • JIS G4051: S40C, S45C

Chemical composition:

The following table shows the chemical composition of EN8 steel:

Element C Si Mn P S
Content (%) 0.36-0.44 0.10-0.40 0.60-1.00 0.05 0.005


Heat the component slowly to 820-860°C and allow it to be heated through. Quench in oil or water.

Heat Treatment :

Heat treatment temperatures, including rate of heating, cooling and soaking times will vary due to factors such as the shape and size of each EN8 steel component.