BooksBritish Standard
En8 Material Chemical Composition, Physical Properties For En-8
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En8 Is A British Standard Grade. En-8 Comes From British Standa / BS 970 Part 3. This Is A Carbon Steel. According to Bs 970/1991 (Part 3), En8 / 080M40 has 5 (Five) Chemical Elements. Also there 4 (Four) Conditions For Mechanical / Physical Properties. 830 Celsius to 860 Celsius temperature need for Normalizing.
Currently En 8’s new name 080M40.
830 Celsius to 860 Celsius temperature need for Normalizing. For Materials Hardening treatment, You must need 830 Celsius to 860 Celsius temperature and for Tempering, the temperature must need 550 Celsius to 660 Celsius. Oil used as a Quench medium for this material.
Chemical Composition For En-8 / 080M40 Carbon Steel
| Chemical Elements | Specified Value For EN 8 / 080M40 Material |
| Carbon (C) | 0.36 To 0.44 % |
| Manganese (Mn) | 0.60 To 1.00 % |
| Silicon (Si) | 0.10 To 0.40 % |
| Sulphur (S) | 0.050 % (Max.) |
| Phosphorus (P) | 0.050 % (Max.) |
Mechanical / Physical Properties For En 8 / 080M40 Carbon Steel
| Sl. No. | Condition | Size (Diameter Across Flats Or Thickness) | Tensile Strength N/Mm2 ( Min.) | Yield Stress N/Mm2 ( Min.) | Percentage Elongation, Minimum At Gauge Length 5.65 √S0 |
| 1 | Normalized + Turned Or Ground | 6 To 150 | 550 | 280 | 16 |
| > 150 To 250 | 510 | 245 | 17 | ||
| 2 | Hot Rolled + Cold Drawn Or Hot Rolled + Cold Drawn + Ground | 6 To 13 | 660 | 530 | 7 |
| > 13 To 16 | 650 | 510 | 8 | ||
| > 16 To 40 | 620 | 480 | 9 | ||
| > 40 To 63 | 600 | 465 | 10 | ||
| > 63 To 76 | 570 | 430 | 10 | ||
| 3 | Hardened And Tempered + Turned Or Ground | Q 6 To 63 | 625 To 775 | 385 | 16 |
| R 6 To 19 | 700 To 850 | 465 | 16 | ||
| 4 | Hardened And Tempered + Cold Drawn Or Hardened And Tempered + Cold Drawn + Ground | Q 6 To 63 | 625 To 775 | 435 | 12 |
| R 6 To 19 | 700 To 850 | 490 | 12 |
Hardness And Impact Properties For En-8 / 080M40 Carbon Steel
| Sl. No. | Condition | Size (Diameter Across Flats Or Thickness) | Hardness ( BHN ) | Impact (J) Izod ( Min.) | Impact (J) KCV ( Min.) |
| 1 | Normalized + Turned Or Ground | 6 To 150 | 152 To 207 | 20 | 16 |
| > 150 To 250 | 146 To 197 | – | – | ||
| 2 | Hot Rolled + Cold Drawn Or Hot Rolled + Cold Drawn + Ground | 6 To 13 | – | – | – |
| > 13 To 16 | – | – | – | ||
| > 16 To 40 | – | – | – | ||
| > 40 To 63 | – | – | – | ||
| > 63 To 76 | – | – | – | ||
| 3 | Hardened And Tempered + Turned Or Ground | Q 6 To 63 | 179 To 229 | 34 | 28 |
| R 6 To 19 | 201 To 255 | 34 | 28 | ||
| 4 | Hardened And Tempered + Cold Drawn Or Hardened And Tempered + Cold Drawn + Ground | Q 6 To 63 | 179 To 229 | 34 | |
| R 6 To 19 | 201 To 255 | 34 |
Hardening, Normalizing And Tempering Parameters For Free-Cutting En 8 / 080M40 Carbon Steel
| Hardening Treatment Temperature (Celsius) | Hardening Treatment Quench medium | Tempering temperature (Celsius) | Normalizing temperature (Celsius) |
| 830 To 860 °C | Oil | 550 To 660 °C | 830 To 860 °C |
