EN8 CARBON STEEL | 080M40 BS970 STANDARD
EN8 Carbon steel is a medium carbon steel with 0.36-0.44% C as per BS 970 standard. It has moderate tensile strength between 500-800Mpa.It is generally supplied in untreated condition or in the normalized condition.EN8 can be hardened by quenching and tempering on limited sections,and also can be flame or induction hardened to produce a good surface hardness(50-55HRC) with moderate wear resistance.
EN8 steel can be easily machined in any condition,and can be welded using suitable welding techniques with the correct procedure.
EN8 Steel Steel Chemical Composition
| Grade | C | Si | Mn | P | S | |
| BS970-1955 | EN8 | 0.35-0.45 | 0.05-0.35 | 0.60-1.0 | ≤ 0.06 | ≤ 0.06 |
| BS970-1991 | 080M40 | 0.36-0.44 | 0.1-0.4 | 0.60-1.0 | ≤ 0.05 | ≤ 0.05 |
EN8 Steel Related Specifications
- BS 970-1991:080M40
- AISI/ASTM A29:1038, 1039,1040,1042,1043, 1045
- DIN Werkstoff No.: 1.0511, 1.1186, 1.1189
- BS & DIN European: C40, CK40, C45, CK45
- JIS G4051: S40C, S45C
EN8 Steel Heat Treatment & Mechanical Property
- Forging:1050℃-1200℃,cool in sand or furnace cool.
- Normalizing:830℃-860℃,Cool in air
- Annealing: 680-710ºC,Cool in furnace
- Quenching:820℃-860℃,oil quench
- Tempering:550°C – 660°C, cool in still air
EN8 Steel Mechanical Property in Normalized and Quenched & Tempered Conditon
Condition | Normalized | Quenched & Tempered | |||
| N | Q | R | |||
| Tensile Strength,Mpa | ≥540 | ≥540 | ≥620 | ≥700 | ≥700 |
| Yield Strength,Mpa | ≥ 280 | ≥540 | ≥435 | ≥495 | ≥495 |
| Elongation | ≥20% | ≥20% | ≥22% | ≥20% | ≥20% |
| ISO V Impact,J | ≥28 | ≥20 | ≥34 | ≥54 | ≥34 |
| Hardness,HBW | 152-207 | 152-207 | 179-229 | 201-255 | 201-255 |
EN8 Round steel Lab Tesing Data with Normalizing condition
| Diameter,mm | Tensile Strength MPa | Yield Strength MPa | Elongation % | Hardness,HB |
| Φ460 | 675 | 375 | 25 | 179-187 |
| Φ510 | 620 | 360 | 28 | 135-167 |
| Φ600 | 615 | 355 | 27 | 124-156 |
EN8 Steel Quality Certification
A material test report(Inspection Certificate EN 10204 3.1) will be provided, documenting the following:
1.Chemical analysis
2.Mechanical properties
3.Surface hardness
4.Non Metallic Inclusion
5.Heat Treatment Process
6.Grain size
7.Forging ratio
8.Ultrasonic test report
EN8 Steel Supply Form & Size &Surface Finish&Tolerance
| Form of Supply | Size(mm) | Length(mm) |
| Round bar | Φ6-Φ1,000 | 3,000-10,000 |
| Square bar | 100x100-600x600 | 3,000-6,000 |
| Plate/Sheet | Thickness :20-400 Width:80-1,000 | 2,000-6,000 |
| Flat bar/Blcoks | Thickness :120-800 Width:120-1,500 | 2,000-6,000 |
| 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 |
Heat treatment:Quenched and Tempered (+QT), Normalizing (+N), Annealing (+A)
