EN8 Steel | BS970 080M40

EN8 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.

EN8 Steel 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 Steel Chemical Composition

Grade	C	Si	Mn	P	S
EN8/080M40	0.36-0.44	0.1-0.4	0.60-1.0	≤ 0.05	≤ 0.05

EN8 Steel Relevant Standards

USA	EN/DIN	Japan
1040/1045	C40/CK40/C45/CK45/1.0511/1.1186/1.1189	S40C/S45C

EN8 Steel Mechanical Property

Condition	N	Q	R
Ruling Section,mm	254	65	20
Tensile Strength,Mpa	510-540	620-770	690-850
Yield Strength,Mpa	≥ 245	≥385	≥465
Elongation	0.17	0.16	0.16
ISO V Impact,J	20	33	33
Hardness,HBW	152-207	179-229	201-255

EN8 Steel 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.

EN8 Steel Heat Treatment

• Normalizing

Heat the steel to the temperature 830-860ºC ,keep the temperature depend on the steel size, then followed by cooling in still air.

• Annealing

Heat EN8 steel  slowly to 680-710°C, keep the temperature stable . 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.

EN8 Steel Application

EN8 steel is widely used in industries which is used in applications where better properties than mild steel are required.

Typical Applications:

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