EN8 Steel (Material BS970 080M40)
En8 steel was renamed as 080M40 in 1970. It is a commonly used medium-carbon engineering steel with good mechanical properties and is widely used in the manufacture of mechanical parts such as general axles and shafts, gears, screws and studs. The standard for this steel is BS970, first published in 1941.
EN8 steel properties and specifications
The following tables summarize the properties and specifications of En8 steel, including chemical composition, mechanical properties, welding, hardness, heat treatment, etc.
Chemical composition
The chemical composition of EN8 steel and BS970 080M40 material is listed in the following table.
| Chemical Composition (Casting Analysis), % | |||||||
| Country (Region) | Standard | Steel | W | Yes | Mn | P, ≤ | S, ≤ |
| Great Britain (United Kingdom) | BS 970-1955 | En8 | 0.35-0.45 | 0.05-0.35 | 0.60-1.00 | 0.06 | 0.06 |
| BS 970-1991 | 080M40 | 0.36-0.44 | 0.10-0.40 | 0.60-1.00 | 0.05 | 0.05 | |
Mechanical properties
The mechanical properties of En8 and 080M40 steels are listed in the following tables, including yield strength (yield stress), ultimate tensile strength, shear strength, modulus of elasticity, modulus of elasticity, etc.
Grades:
- 1 MPa = 1 N/mm2
- 1 GPa = 1kN/mm2
| BS970 080M40, Mechanical Properties of En8 Steel | |||||||||
| Standard | Steel | Tensile strength, Mpa (ksi), ≥ | Yield strength, Mpa (ksi), ≥ | 0.2% proof strength | Elongation after fracture, 5.65 S0, ≥ | Impact, Izod (Charpy V-notch impac) in J, ≥ | Hardness, HB | Diameter between planes or thickness | |
