EN30B Alloy Steel Round Bars

EN30B alloy steel round bars is commonly used in applications where high strength and good wear resistance are required, such as gears, shafts, and axles in the automotive and aerospace industries.

Details About EN30B Alloy Steel Round Bars, including chemical composition, mechanical properties, and typical heat treatment:

Chemical Composition (approximate values):

• Carbon (C): 0.26-0.34%
• Silicon (Si): 0.10-0.35%
• Manganese (Mn): 0.40-0.70%
• Phosphorus (P): 0.035% max
• Sulfur (S): 0.035% max
• Chromium (Cr): 0.90-1.20%
• Nickel (Ni): 1.30-1.80%
• Molybdenum (Mo): 0.25-0.35%

Mechanical Properties:

• Tensile Strength: 850-1050 MPa
• Yield Strength: 650-800 MPa
• Elongation: 16-20% (in 50 mm)
• Hardness: 280-320 HB

Physical Properties:

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

Heat Treatment:

EN30B alloy steel is typically supplied in the annealed and normalized condition. However, for achieving desired mechanical properties, it undergoes various heat treatment processes, such as:

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 870-910°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 150-250°C to reduce internal stresses and improve toughness without significantly sacrificing hardness.

Proper heat treatment is crucial to optimize the mechanical properties of EN30B alloy steel for specific applications.