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EN3B Bright Mild Steel, also known as 070M20, is a low-carbon steel without significant alloying elements, making it ideal for a variety of general-purpose engineering applications. Its carbon content is typically below 0.25%, and it is most commonly supplied in the form of cold-drawn bright bars. This steel is especially favored for applications where high stress is not involved.
In its bright cold-drawn condition, EN3B can withstand higher stress levels, particularly in smaller diameters. The bright steel offers more accurate sectional tolerances, greater straightness, and a cleaner surface than hot-rolled alternatives. It is also easier to machine to the final size, reducing machining costs. Compared to standard mild steel, bright mild steel has enhanced physical strength. EN3B is also suitable for welding and can be case-hardened.
EN3B Bright Bar is commonly used in various low-stress engineering applications, including:
| Element | Content (%) |
|---|---|
| Carbon (C) | Max 0.25 |
| Silicon (Si) | Max 0.35 |
| Manganese (Mn) | Max 1.00 |
| Phosphorus (P) | Max 0.06 |
| Sulfur (S) | Max 0.06 |
| Chromium (Cr) | – |
| Molybdenum (Mo) | – |
| Nickel (Ni) | – |
| Condition | Tensile Strength (MPa Min.) | Yield Strength (MPa Min.) | Elongation (%) |
|---|---|---|---|
| Cold Drawn | 560 | 440 | 10 |
| Turned & Polished | 430 | 215 | 21 |
EN3B Bright Bar typically has moderate hardness suitable for low-stress applications and machining.
EN3B Bright Bar can undergo various heat treatments to enhance specific mechanical properties.
EN3B steel can be case-hardened, which involves heating the surface and then quenching to produce a hardened exterior while keeping the core relatively soft.
Tempering is typically carried out after hardening to adjust the toughness and hardness of the steel.
EN3B exhibits standard thermal properties for mild steel and can withstand typical temperatures in general engineering applications.
EN3B steel can be easily forged, making it versatile for a variety of mechanical applications.
Stress relieving is performed to reduce internal stresses caused by cold working, typically at temperatures between 450-650°C.
Normalizing involves heating EN3B steel to 850°C and then cooling it in air, enhancing ductility and machinability.
Annealing is performed at temperatures between 780-820°C, followed by slow cooling, to soften the material for further machining.
The density of EN3B Bright Bar is approximately 7.85 kg/m³, typical of low-carbon steels.
EN3B Bright Bar has good machinability and is often used for parts that require extensive machining.
EN3B steel is suitable for welding and can be welded using common techniques like MIG, TIG, and arc welding. Pre-heating is not generally necessary for EN3B, but certain applications may require it for best results.
Titan Steel & Engineers Related Products:
Carbon Steel, Alloy Steel, Bright Steel, Spring Steel, Die Steel & Tool Steel, Special Alloy Steel
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