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Grade Introduction:

EN8 is unalloyed medium carbon Steel (BS 970 080m40) has high strength levels compared to normal bright Mild Steel, due to thermo mechanical rolling. EN8 is suitable for all round engineering purposes that may require a Steel of greater strength.
Bright Bars offered to find application in areas like Machined Components, Dairy Equipment, Pump Shafts, Valves, Hinges, Pins, Surgical and Medical Parts and other end usages. These EN8 Bright Round Bars can be offered in different finishes, sizes and specification. The solutions offered by this bars include MS Bright Rounds Bars, MS Bright Flat Bars, MS Bright Square Bars, EN8 Bright Round Bars, EN8 Bright Square Bars, EN8 Bright Flat Bars, EN8 Bright Hexagonal Bars etc.
We offer a wide range of size and material grade of round bars of mild steel, alloy steel and EN series. Our range of EN8 Bright Round Bars finds in many industries such as railways, construction, automotive etc.

Grade Application:

  • Machined Components
  • Dairy Equipment
  • Pump
  • Shafts
  • Valves
  • Hinges
  • Pins
  • Surgical and Medical Parts and other end usages.

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, 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, 2714, SKD-11, P20, P20+S, P20+Ni, SCM 420, ASTM SA-36, ASTM SA-105, SAE 1018, SAE 1020, SAE 4140, SAE 8620, 16MNCR5, 20MNCR5, C20, C35, C40, C45, C50, C60, CK45, 20C8, 40C8, 45C8, 55C8, C55MN75, SAE 52100, S40C, S355J2G3.

Our Supply Range:

Price List:

bright bar

People also search as:

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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:

Condition Yield Stress * 106 Pa Tensile Stress MPa Elongation %
Normalized 280 550 16
Cold drawn (thin) 530 660 7


Heat Treatment:

EN8 or 080m40 can be tempered at a heat of between 550°C to 660°C (1022°F-1220°F), heating for about 1 hour for every inch of thickness, then cool in oil or water.
Quenching in oil or water after heating to this temperature will harden the steel.



Physical Properties

Thermal Properties

Forging Properties:

Stress Relieving:


EN8 bright Mild Steel takes place at 830-860°C (1526°F-1580°F) then it is cooled in air.


Anneal afterwards is recommended to prevent breaking.




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.

Supply Cities:

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