10SPb20 Steel Grade: A Comprehensive Overview

The 10SPb20 steel grade is a low carbon, leaded free-cutting steel. It is mainly used for manufacturing parts that require excellent machinability, such as bolts, nuts, and studs. Here is a comprehensive overview of the mechanical properties, chemical composition, and other important information about this steel grade:

Mechanical Properties:
– Tensile Strength: 360-520 MPa
– Yield Strength: 230-350 MPa
– Elongation: 18-30%
– Reduction in Area: 40-55%
– Impact Energy: 27-50 Joules
– Hardness: 100-230 HB

Chemical Composition (in weight percentage):
– Carbon (C): 0.07-0.14%
– Silicon (Si): 0.17-0.37%
– Manganese (Mn): 0.60-1.00%
– Phosphorus (P): max. 0.045%
– Sulfur (S): max. 0.35%
– Lead (Pb): 0.15-0.30%
– Copper (Cu): max. 0.30%

Other Important Information:
– The presence of lead in the 10SPb20 steel grade enhances its machinability by acting as a lubricant during the cutting process.
– This steel grade is not suitable for welding due to the presence of lead.
– The inclusion of copper improves the corrosion resistance of the steel.
– The steel can be readily cold worked and heat treated to improve its mechanical properties.
– The recommended heat treatment for this steel grade is annealing at 860-920°C followed by slow cooling.
– The steel should be machined with low cutting speeds and sharp tools to prevent work hardening and tool wear.

Overall, the 10SPb20 steel grade is a versatile and easily machinable steel that is widely used in various industries. Its lead content enhances its machinability, but precautions should be taken during welding.
10SPb20 Steel grade
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