EN28 Alloy Steel Round Bars

EN28 is a high-strength nickel-chromium-molybdenum alloy steel known for its excellent combination of toughness, wear resistance, and high tensile strength.

Details Regarding EN28 Alloy steel Round Bars:

Chemical Composition:

• Carbon (C): 0.30-0.36%
• Silicon (Si): 0.10-0.35%
• Manganese (Mn): 0.50-0.80%
• Phosphorus (P): ≤ 0.040%
• Sulfur (S): ≤ 0.040%
• Chromium (Cr): 0.90-1.40%
• Nickel (Ni): 2.00-2.50%
• Molybdenum (Mo): 0.25-0.35%

Mechanical Properties:

• Tensile Strength: 800-1000 MPa
• Yield Strength: 650-800 MPa
• Elongation: 12-16% (in 50 mm)
• Hardness: 250-320 HB

Physical Properties:

• Density: ~7.85 g/cm³
• Melting Point: ~1420-1470°C

Heat Treatment:

EN28 alloy steel typically undergoes various heat treatment processes to achieve desired mechanical properties:

Annealing: Heating the material to around 850-900°C and then slowly cooling it in the furnace to relieve internal stresses and improve machinability.

Normalizing: Heating the material to around 880-920°C, followed by air cooling to room temperature. This process refines the grain structure and enhances the mechanical properties.

Hardening: Heating the material to a temperature range of 850-900°C and then quenching it in oil or water to achieve high hardness and strength.

Tempering: Reheating the hardened material to a temperature range of 540-680°C and holding it for a specific time to reduce internal stresses and improve toughness without significantly sacrificing hardness.