EN8 Chemical Composition:
| Element |
C |
Si |
Mn |
P (Max) |
S (Max) |
| Content (%) |
0.36-0.44 |
0.10-0.40 |
0.60-1.00 |
0.05 Max |
0.005 Max |
EN8 Mechanical Properties:
| Property |
Metric |
Imperial |
| Tensile Strength (Rm) |
550-850 MPa |
79,800-123,300 psi |
| Yield Strength (Rp 0.2) |
280-450 MPa |
40,600-65,300 psi |
| Elongation |
16% |
16% |
| Impact Strength (Izod) |
15-28 J |
11-21 ft.lbs |
| Hardness (Brinell) |
152-255 HB |
152-255 HB |
EN8 Hardness:
EN8 exhibits Brinell hardness in the range of 152-255 HB.
EN8 Heat Treatment:
The heat treatment process for EN8 includes several steps, and exact times and temperatures depend on the component’s size and shape.
- Hardening: Heat slowly to 820-860°C, quench in oil or water for optimal hardness.
- Tempering: Reheat after quenching to 550-660°C, allowing 1 hour per 25 mm thickness for soaking, followed by air cooling.
EN8 Physical Properties:
| Property |
Value |
| Density |
7800 kg/m³ |
| Young’s Modulus |
190 GPa |
| Poisson’s Ratio |
0.30 |
EN8 Thermal Properties:
| Property |
Value |
| Thermal Conductivity |
37.5 W/m K |
| Thermal Expansion Co-efficient |
6.5e-6 W/m K |
EN8 Forging Properties:
Preheat the EN8 steel carefully, then raise the temperature to 1050°C for forging. Do not forge below 850°C and allow slow cooling, preferably in a furnace.
EN8 Stress Relieving:
Stress relieving is applied to remove residual stresses caused by processes like machining or welding. Treatment at 150-200°C reduces stress without significantly altering hardness. Alternatively, stress relief can be performed at 600-680°C for complete stress reduction, particularly after welding.
EN8 Normalizing:
Normalize EN8 by heating to 1050°C and then cooling in air. This process helps improve the mechanical properties and refines the grain structure.
EN8 Annealing:
Anneal by heating the steel to 680-710°C and allowing it to cool slowly in the furnace to achieve softness for further machining.
EN8 Machinability:
EN8 steel has good machinability, allowing ease of processing into various shapes and sizes.
EN8 Welding:
Modern EN8 steel contains less carbon than it used to, which means pieces up to 18mm thick can be welded without preheating using MIG wire (SG2) or a 7018 electrode. For sections over 18mm, preheating to 100°C (212°F) is necessary to prevent cracking. Post-weld annealing is recommended to prevent material failure.
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Carbon Steel, Alloy Steel, Bright Steel, Spring Steel, Die Steel & Tool Steel, Special Alloy Steel
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