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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 | |||
| 660 (95.7) | 530 (77) | 495 (71) | 7 | – | 6| Hot rolled + cold drawn or | hot rolled + cold drawn + ground | |||
| 650 (94) | 510 (74) | 485 (70) | 8 | – | 13 | ||||
| 620 (90) | 480 (70) | 435 (63) | 9 | – | 16 | ||||
| 600 (87) | 465 (67) | 370 (53) | 10 | – | 40 | ||||
| 570 (82.6) | 430 (62) | 350 (50) | 10 | – | 63 | ||||
| 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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Source :- theworldmaterial dot com
