Understanding the Composition and Strength of 640A35 Steel Grade

The 640A35 steel grade is a low-alloy steel commonly used in applications where high strength and toughness are required. Its composition and mechanical properties are as follows:

Chemical Composition:
– Carbon (C): 0.32-0.40%
– Silicon (Si): 0.17-0.37%
– Manganese (Mn): 0.60-0.90%
– Phosphorus (P): 0.030% max
– Sulfur (S): 0.050% max
– Chromium (Cr): 0.90-1.20%
– Nickel (Ni): 0.30% max
– Copper (Cu): 0.25% max
– Molybdenum (Mo): 0.15-0.25%

Mechanical Properties (typical values at room temperature):
– Tensile Strength: 700-850 MPa
– Yield Strength: 640 MPa
– Elongation: 13-16%
– Hardness: 230-270 HB

The 640A35 steel grade exhibits high tensile and yield strength, as well as good toughness and ductility. It is suitable for applications in structural components, such as gears, shafts, and connecting rods, where high strength and good impact resistance are required. This steel grade can be heat treated to further improve its mechanical properties.
640A35 Steel grade
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