Description
EN8M – Bright Bar Grade Introduction: EN8M Bright Bars are a type of free-cutting steel, widely used across industries for manufacturing parts such as shafts, gears, studs, and pins. EN8M is made with medium carbon content and sulfur, making it suitable for machining processes where it forms chips. This steel grade offers good machinability and is available in various shapes, including round and hexagonal bars. Its properties like corrosion resistance, durability, and the ability to handle moderate loads make it a reliable choice for various applications.
EN8M – Bright Bar Grade Application: EN8M Bright Bars are typically used in:
- Shafts
- Gears
- Studs
- Pins
EN8M – Bright Bar Equivalent Grades:
- USA: ASTM 1345
- Japanese: SMnC443
- German: EN8M
- British: EN8M
- International: ISO EN8M
- Chinese: GB 45Mn2
Additional Steel Grades: MS, EN1A, EN8, EN9, EN24, EN31, EN36C, 42Crmo4, HCHCR, D2, D3, H-11, P20, SAE4140, SAE8620, C20, C45, CK45, SAE52100, and more.
EN8M – Bright Bar Chemical Composition:
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.35-0.45 |
| Silicon (Si) | 0.25 |
| Manganese (Mn) | 1.00-1.30 |
| Phosphorus (P) | Max 0.060 |
| Sulfur (S) | 0.12-0.20 |
EN8M – Bright Bar Mechanical Properties:
| Property | Metric | Imperial |
|---|---|---|
| Hardness, Brinell | 300 | 33 |
| Hardness, Rockwell C | 30 | 30 |
| Tensile Strength, Ultimate | 965-1030 MPa | 140000-150000 psi |
| Tensile Strength, Yield | 827-862 MPa | 120000-125000 psi |
| Elongation at Break | 20.0% | 20.0% |
| Compressive Strength | 862 MPa | 125000 psi |
| Charpy Impact (V-Notch) | 27.1-33.9 J | 20.0-25.0 ft-lb |
| Poisson’s Ratio | 0.27-0.30 | 0.27-0.30 |
| Elastic Modulus | 190-210 GPa | 27557-30457 ksi |
EN8M – Bright Bar Hardness:
- Hardness: 300 Brinell
EN8M – Bright Bar Heat Treatment: Heat treatment processes for EN8M Bright Bars vary depending on the size and shape of the steel component. Key factors like heating rates, cooling methods, and soaking times depend on furnace types and quenching mediums. Consulting a heat treatment specialist is recommended for specific cases.
EN8M – Bright Bar Hardening: Heat the component slowly to 820-860°C, allowing it to heat through uniformly. Quench in oil or water to harden the steel.
EN8M – Bright Bar Tempering: After quenching, temper the component immediately while it is still warm. Reheat to the tempering temperature (typically 550-660°C), soak for one hour per 25 mm of thickness, and then cool in air.
EN8M – Bright Bar Forging Properties: Preheat the steel carefully, then raise the temperature to 1050°C for forging. Avoid forging below 850°C, and after forging, cool the steel slowly, preferably in a furnace.
EN8M – Bright Bar Annealing: Heat slowly to 680-710°C, soak thoroughly, and cool the material slowly in the furnace to achieve proper annealing.
EN8M – Bright Bar Machinability: EN8M Bright Bars offer excellent machinability, making them suitable for high-speed machining processes.
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