A Comprehensive Guide to Understanding 640A35 Steel Grade

640A35 is a special alloy steel grade that is commonly used in the automotive, aerospace, and machinery industries. This steel grade offers excellent strength, toughness, and wear resistance, making it suitable for various applications that require high performance and durability.

Chemical Composition:
– Carbon (C): 0.30%-0.35%
– Silicon (Si): 0.15%-0.35%
– Manganese (Mn): 0.45%-0.75%
– Phosphorus (P): ≤ 0.035%
– Sulfur (S): ≤ 0.035%
– Chromium (Cr): 0.70%-1.00%
– Nickel (Ni): 0.40%-0.70%
– Molybdenum (Mo): 0.20%-0.30%
– Vanadium (V): 0.10%-0.20%

Mechanical Properties:
– Tensile Strength: 900 MPa (min)
– Yield Strength: 700 MPa (min)
– Elongation: 14% (min)

Technical Properties:
– Hardness: 250-310 HB (Brinell hardness)
– Density: 7.85 g/cm³
– Thermal Conductivity: 45-50 W/m°C
– Electrical Conductivity: 10-15% IACS (International Annealed Copper Standard)

This steel grade is known for its excellent heat treatment response, allowing it to be hardened and tempered to achieve optimal mechanical properties. It also exhibits good machinability and weldability, making it suitable for various fabrication processes.

640A35 is often used in the production of critical components such as gears, shafts, axles, and crankshafts, where high strength and fatigue resistance are essential. It is also commonly used in the manufacturing of heavy-duty machinery and equipment.

Understanding the specifications, mechanical properties, technical properties, and chemical composition of 640A35 steel grade is crucial in ensuring its proper selection and utilization in different applications.