Looking for trusted EN8 Carbon Steel Round Bar Manufacturers & Suppliers in Mumbai ? We Titan Steel, Mumbai provide durable, precision-engineered carbon steel round bars for construction, industrial, and engineering needs. Get reliable quality, competitive prices, and timely delivery from leading suppliers in Mumbai.
EN8 is a widely used medium carbon steel grade that offers reasonable tensile strength and is typically supplied in cold-drawn or as-rolled conditions. With tensile properties ranging from 500-800 N/mm², EN8 is ideal for applications requiring better properties than mild steel without the higher costs of alloy steel. EN8 can be flame or induction hardened to provide a hard surface with moderate wear resistance. It is available in various forms such as bars and plates, and can be customized and supplied cut to size.
EN8 steel is used in a wide range of general engineering applications where higher strength is required than in mild steel, including:
| Standard | Equivalent Grades |
|---|---|
| BS 970-1991 | 080M40 |
| AISI/ASTM A29 | 1038, 1040, 1045 |
| DIN Werkstoff No. | 1.0511, 1.1186, 1.1189 |
| BS/DIN European | C40, CK40, C45, CK45 |
| JIS G4051 | S40C, S45C |
We also supply grades such as MS, EN1A, EN8D, EN9, EN24, EN31, EN36C, and more, including alloy steels like 42CrMo4, H13, and SCM420.
| 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 |
| 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 exhibits Brinell hardness in the range of 152-255 HB.
The heat treatment process for EN8 includes several steps, and exact times and temperatures depend on the component’s size and shape.
| Property | Value |
|---|---|
| Density | 7800 kg/m³ |
| Young’s Modulus | 190 GPa |
| Poisson’s Ratio | 0.30 |
| Property | Value |
|---|---|
| Thermal Conductivity | 37.5 W/m K |
| Thermal Expansion Co-efficient | 6.5e-6 W/m K |
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.
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.
Normalize EN8 by heating to 1050°C and then cooling in air. This process helps improve the mechanical properties and refines the grain structure.
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 steel has good machinability, allowing ease of processing into various shapes and sizes.
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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