EN8D
EN8D Grade Introduction:
En8D steel bar is a medium carbon steel grade of engineering steel that offers greater strength and hardness as compared to the low carbon grades. The formability and weldability of En8d are fair when using accepted shop practices. While machinability is good, this grade responds very well to forging and heat treating. It is one of the most used grades of carbon steel. People requiring better properties such as strength, etc generally go for alloy steel if En8d or equivalent grades are not suitable.
EN8D Grade Application:
- gears
- shafts
- axles,
- bolts and studs
- crane wheels
- machine parts
EN8D Equivalent Grades:
| Internal Standard |
BS |
DIN |
IS |
EN |
SAE/AISI |
| EN8D |
080A40 |
CK45 |
45C8 |
EN8D |
1040, 1045 |
EN8D Chemical Composition:
| Element |
Content (%) |
| C |
0.40-0.45 |
| Mn |
0.70-0.90 |
| P |
0.045 Max |
| S |
0.045 Max |
Mechanical Properties:
| Property |
Value |
| Max Stress |
700-850 N/mm² |
| Yield Stress |
465 N/mm² Min (up to 19mm LRS) |
| 0.2% Proof Stress |
450 N/mm² Min (up to 19mm LRS) |
| Elongation |
16% Min (12% if cold-drawn) |
| Impact KCV |
28 Joules Min (up to 19mm LRS) |
| Hardness |
201-255 Brinell |
Physical Properties:
| Property |
Value |
| Tensile Strength |
90,000 psi |
| Yield Strength |
50,000 psi |
| Elongation in 2" |
20% |
| Reduction of Area |
30% |
| Brinell Hardness |
180-220 |
Forging Properties:
Preheat the steel carefully, and then raise the temperature to 1050°C for forging. Do not forge below 850°C. After forging cool slowly, preferably in a furnace.