EN8 Steel Properties BS970 080M40 Equivalent Material Tensile Yield Strength

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EN8 Steel (BS970 080M40 Material)

En8 steel was renamed 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, bolts and stud bolts. The standard for this steel is BS970, first published in 1941.

EN8 Steel Properties & Specifications

The following tables summarize En8 steel properties, and specifications including chemical composition, mechanical properties, welding, hardness, heat treatment, etc.

Chemical Composition

EN8 steel and BS970 080M40 material chemical composition is listed in the following table.

Chemical Composition (Cast Analyses ), %
Country (Region) Standard Steel C Si Mn P, ≤ S, ≤
Britain (UK) 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

En8 and 080M40 steel mechanical properties are listed in the following tables including yield strength (yield stress), ultimate tensile strength, shear strength, modulus of elasticity, young’s modulus, etc.

Notes:

  • 1 MPa = 1 N/mm2
  • 1 GPa = 1 kN/mm2
BS970 080M40, En8 Steel Mechanical Properties
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 across flats or thickness (t), mm Condition
BS 970-1991 080M40 (En8) 550 (80) 280 (40) 16 20 (16) 152-207 6≤t≤ 150 Normalized + turned or ground
510 (74) 245 (35) 17 146-197 150<t≤ 250
660 (95.7) 530 (77) 495 (71) 7 6<t≤ 13 Hot rolled + cold drawn or
hot rolled + cold drawn + ground
650 (94) 510 (74) 485 (70) 8 13<t≤ 16
620 (90) 480 (70) 435 (63) 9 16 <t≤ 40
600 (87) 465 (67) 370 (53) 10 40 <t≤ 63
570 (82.6) 430 (62) 350 (50) 10 63 <t≤ 76
625-775 (90-110) 385 (55) 355 (51) 16 34 (28) 179-229 6≤ t≤ 63 Hardened and tempered + turned or ground
700-850 (100-123) 465 (67) 450 (65) 16 34 (28) 201-255 6≤ t≤ 19
625-775 (90-110) 435 (63) 380 (55) 12 34 (28) 179-229 6≤ t≤ 63 Hardened and tempered + cold drawn or
hardened and tempered + cold drawn + ground
700-850 (100-123) 490 (71) 460 (66) 12 34 (28) 201-255 6≤ t≤ 19

En8 Heat Treatment

En8 material heat treatment are listed below, including normalizing, hardening and termpering.

  • Normalizing temperature: 830 to 860 °C (1525-1580 °F)
  • Hardening: 830 to 860 °C (1525-1580 °F), oil quench,
  • Tempering temperature: 550 to 660 °C (1020-1220 °F)

En8 Steel Equivalent Grade

BS970 080M40 material or En8 steel equivalent to European EN (German DIN EN, French NF EN), ISO, Japanese JIS and Chinese GB standard (for reference).

En8 and 080M40 Steel Equivalent Grade
Britain European Union US China Japan ISO
Standard Steel name Standard Steel name (Steel number) Standard Grade (UNS) Standard Grade Standard Grade Standard Grade
BS970-1955;
BS970-1991
En8;
080M40
EN 10083-2 C40 (1.0511);
C40E (1.1186);
C45 (1.0503)
AISI
SAE;
ASTM A29/A29M
1040 (G10400)
1045 (G10450)
GB/T 699 40;
45 steel
JIS G4051 S40C ISO 683-18 C40;
C40E;
C45

Related material: 1.4404 (X2CrNiMo17-12-2)AISI 1018, AISI 1095, SAE 1020, AISI 1080

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