What is EN8 Carbon Steel?

EN8 carbon steel is a common medium carbon and medium tensile steel, with improved strength over mild steel, through-hardening medium carbon steel. EN8 carbon steel is also readily machinable in any condition.

EN8 steels are generally used in the as supplied untreated condition. But EN8 steels can be further surface-hardened by induction processes, producing components with enhanced wear resistance. Steel EN8 materials in its heat treated forms possesses good homogenous metallurgical structures, giving consistent machining properties.

en8 carbon steel 080m40 bs 970-

Good heat treatment results on sections larger than 65mm may still be achievable, but it should be noted that a fall-off in mechanical properties would be apparent approaching the centre of the bar. It is therefore recommended that larger sizes of EN8 steel materials are supplied in the untreated condition, and that any heat treatment is carried out after initial stock removal. This should achieve better mechanical properties towards the core.

RFQ OF EN8 STEEL

 

1. EN8 Steel is Steel Grade in BS 970 1955 Specification

EN8 steel grade belongs to the standard of BS 970-1955, which is a standard for wrought steel for mechanical and allied engineering purpose. In BS 970 standards, there are some other common steel grades, like EN9, EN19, EN24, EN36 etc. And the most equivalent is grade 080M40 steel in BS 970-1991.

2. EN8 Carbon Steel is Available in Following Shape:

We could supply EN8 steel in bright round bar in drawn/turned condition or round hot rolled, hexagon, square, steel flats and plate.

  • EN8 Steel Round Bar: 8mm-1600mm
  • EN8 Steel Cold Drawn Bar: 5mm-70mm
  • EN8 Carbon Steel Flat & Plate: 10-1500mm x 200-3000mm

Sizes of other shapes are available, please send emails to us for specific checking.

3. EN8 Carbon Steel Grade Equivalents

Other steel grades in ASTM, DIN, JIS standards are similar and equivalent to EN8 steel, as follows:

  • 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

4. EN8 Carbon Steel Properties

4.1 Carbon Steel EN8 Chemical Composition

Standard Grade C Mn P S Si
BS 970 EN8/080M40 0.36-0.44 0.60-1.00 0.05 0.005 0.10-0.40

4.2 EN8 Medium Carbon Steel Mechanical Properties and Hardness

Heat Treatment Tensile Strength Rm Yield Strength
Rm		 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

 

RFQ OF EN8 STEEL

5. Forging of Carbon Steel Grade EN8/080M40

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.

6. Heat Treatment of EN8 Carbon Steel

EN8 steel is usually supplied untreated but also be able to be supplied to order in the normalized or finally heat treated, which is adequate for a wide range of applications.

  • Tempering – Carbon steel 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.
  • Normalising of EN8 bright mild steel takes place at 830-860°C (1526°F-1580°F) then it is cooled in air.
  • Quenching: in oil or water after heating to this temperature will harden the steel.

7. Applications of EN8 Carbon Steel

EN8 steel material is suitable for the 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.

We supply steel grade EN8 to some customers in middle east like UAE, Europe countries like UK and also in Africa like south africa. We will have some EN8 carbon steel promotion at the end of almost every month. Just send emails with detailed requests for EN8 carbon steels price.