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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. Tensile properties can vary but are usually between 500-800 N/mm². 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 and normalized. 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
Addition to other grades:
MS, EN1A, EN3B, EN8, EN8D, EN9, EN19, EN24, EN31, EN32B, EN36C, EN41B, EN43B, EN47, EN353, IS2062, 42Crmo4, HCHCR, D2, D3, H-11, H-13, CW-1, OHNS, M2, M35, M42, DIN1.2714, P20, P20+S, P20+Ni,  SCM420, ASTMSA-36, ASTMSA-105, SAE1018, SAE4140, SAE8620, 16MNCR5, 20MNCR5, C20, C45, C50, C60, CK45, 20C8, 40C8, 45C8, 55C8, C55MN75, SAE52100, S40C, S355J2G3.
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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
Mechanical Properties:
Heat Treatment Tensile Strength Rm Yield StrengthRm Rp 0.2 A min on Impact Hardness
5.65√So Izod Ft.lb KCV J
MPa MPa MPa       HB
N 550 280 16 15 16 152/207
510 245 17 146/197
Q 625/775 385 355 16 25 28 179/229
R 700/850 465 450 16 25 28 201/255
HB 152 – 255
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. Other considerations during the heat treatment process include the type of furnace, quenching medium and work piece transfer facilities.
Heat the component slowly to 820-860°C and allow it to be heated through. Quench in oil or water.
Temper the EN8 component immediately after quenching whilst tools are still hand warm. Re-heat the EN8 component to the tempering temperature then soak for one hour per 25 millimeter of total thickness (2 hours minimum) Cool in air. For most applications tempering of EN8 will be between 550-660°C.
Physical Properties:
Thermal Properties:
Thermal conductivity: 37.5 W/m K 
Thermal co-efficient: 6.5e-6 W/m K.
Forging Properties:
Preheat the steel carefully, then raise temperature to 1050°C for forging. Do not forge below 850°C. After forging cool slowly, preferably in a furnace.
Stress Relieving:
Stress relieving is applied to both ferrous and non-ferrous alloys and is intended to remove internal residual stresses generated by prior manufacturing processes such as machining, cold rolling and welding. Without it, subsequent processing may give rise to unacceptable distortion and/or the material can suffer from service problems such as stress corrosion cracking.
The treatment is not intended to produce significant changes in material structures or mechanical properties, and is therefore normally restricted to relatively low temperatures.
Carbon steels and alloy steels can be given two forms of stress relief:
  • Treatment at typically 150-200°C relieves peak stresses after hardening without significantly reducing hardness (e.g. case-hardened components, bearings, etc.).
  • Treatment at typically 600-680°C (e.g. after welding, machining etc.) provides virtually complete stress relief.
Non-ferrous alloys are stress relieved at a wide variety of temperatures related to alloy type and condition. Alloys that have been age-hardened are restricted to stress relieving temperatures below the ageing temperature.
Austenitic stainless steels are stress relieved below 480°C or above 900°C, temperatures in between reducing corrosion resistance in grades that are not stabilized or low-carbon. Treatments above 900°C are often full solution anneals.
Preheat the EN8 steel carefully, then raise temperature to 1050°C for forging. Do not forge below 850°C. After forging cool en8 steel slowly, preferably in a furnace.
Heat slowly to 680-710°C, soak well. Cool slowly in the furnace.
7800kg/m-3 Young’s modulus: 190Gpa Poission ratio: 0.3 Isotopic
Modern EN8 bright Mild Steel contains a lot less carbon then it use to, this mean that it is possible to weld pieces up to 18mm thick without preheating using MIG wire (SG2) or a 7018 electrode.
Over 18mm would require a pre-heat of 100°C (212°F) in order to prevent cracking.
Anneal afterwards is recommended to prevent breaking.
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