BS970 EN8 Carbon steel | 080M40

EN8 Carbon steel is a medium carbon steel with  0.36-0.44% C as per BS 970 standard. It has moderate tensile strength between 500-800Mpa.It is generally supplied in untreated condition or in the normalized condition.EN8 can be hardened by quenching and tempering on limited sections,and also can be flame or induction hardened to produce a good surface hardness(50-55HRC) with moderate wear resistance.

EN8 steel can be easily machined in any condition,and can be welded using suitable welding techniques with the correct procedure.

EN8 Forged carbon steel round bar

1.EN8 steel Supply Form & Size

Hot rolled round bar:Φ20-Φ200mm,Length:3000-6000mm

Hot Forged round bar:Φ80-Φ1000mm,Length:3000-10000mm

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

2.Surface Finish&Tolerance

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

3.EN8 Steel Chemical Composition

EN8/080M400.36-0.440.1-0.40.60-1.0≤ 0.05≤ 0.05
EN8D/080A420.4-0.450.1-0.40.7-0.9≤ 0.05≤ 0.05
EN8M/212A420.4-0.45≤ 0.251.0-1.3≤ 0.060.12-0.2

4.EN8 Steel Related Specifications

  • BS 970-1991:080M40
  • AISI/ASTM A29:1038, 1039,1040,1042,1043, 1045
  • DIN Werkstoff No.: 1.0511, 1.1186, 1.1189
  • BS & DIN European: C40, CK40, C45, CK45
  • JIS G4051: S40C, S45C

5.Mechanical Property For EN8 Steel

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

6.EN8 steel Forging

Forging temperature:950-1050℃,EN8 steel should be cooled as slowly as possible in still air or in sand after forged.

6.Heat Treatment For EN8 Steel

  • Normalizing

The normalizing temperature range for this grade is typically 830-860ºC,followed by cooling in still air.

  • Annealing

Heat slowly to 680-710°C, soak well. 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.

7.EN8 Steel Application

EN8 is a popular steel in industry from the automotive trade to wider general engineering applications,it is widely used for many general engineering applications.

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