EN8/080M40 carbon steel is a British grade as per BS 970 standard.It has medium carbon content with 0.36-0.44% which gives it medium tensile strength.EN8 steel is generally supplied in untreated condition or normalized condition.For further process,it can be flame or induction hardened to produce a good surface hardness(50-55HRC) and moderate wear resistance.EN8 materials in its heat treated forms possesses good homogenous metallurgical structures, giving stable machining properties,so it can be easily machined in any condition.
1.Supply Form & Size & Tolerance
Hot Forged round bar:Φ130-Φ1000mm,Length:3000-10000mm
Flat bar/Blcoks:Thickness :120-800mm xWidth:120-1500mm,Length:2000-6000mm
|Surface Finish||Black-Forged||Black-Rolled||Turned||Grinding||Polished||Peeled||Cold Drawn|
|Tolerance||(0，+5mm)||(0，+1mm)||(0，+3mm)||Best h9||Best h11||Best H11||Best H11|
|EN8/080M40||0.36-0.44||0.1-0.4||0.60-1.0||≤ 0.05||≤ 0.05|
4. Mechanical Property
|Yield Strength,Mpa||≥ 245||≥385||≥465|
|ISO V Impact,J||20||33||33|
5.Forging EN8/080M40 steel
Forging temperature around 1050℃,but don’t forge below 950℃,EN8 steel should be cooled as slowly as possible in still air(may get fine grain) or in sand after forged.
Heat the steel to the temperature 830-860ºC ,keep the temperature depend on the steel size, then followed by cooling in still air.
Heat EN8 steel slowly to 680-710°C, keep the temperature stable . Cool slowly in the furnace.
Hardening of this grade is carried out from an austenitizing temperature of 820-860ºC followed by oil or water quenching.
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.
EN8 steel is widely used in industries which is used in applications where better properties than mild steel are required.
- Automotive parts
- Connecting rods
- Studs, bolts
- Axles, spindles
- General engineering components