11SMnPb30 is a free-cutting steel widely used in precision parts manufacturing. It offers excellent machinability due to its chemical composition. This article outlines the key elements and mechanical properties that make it suitable for high-efficiency machining.
Chemical Composition of 11SMnPb30
| Element | Content (%) | Role in Alloy |
|---|---|---|
| C | 0.14–0.20 | Provides hardness and strength |
| Mn | 1.00–1.50 | Improves strength and hot workability |
| P | ≤0.11 | Enhances machinability |
| S | 0.27–0.33 | Improves machinability |
| Pb | 0.15–0.35 | Greatly enhances cutting performance |
| Fe | Balance | Base metal |
Mechanical Properties of 11SMnPb30
| Property | Typical Value |
|---|---|
| Tensile Strength | 440–580 MPa |
| Yield Strength | ~280 MPa |
| Elongation | ~22% |
| Hardness | ~160 HB |
| Machinability | Excellent |
Key Advantages
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Excellent machinability: Thanks to sulfur and lead content, it enables faster, smoother machining.
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Good surface finish: Ideal for parts requiring tight tolerances.
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Stable dimensions: Low risk of deformation during turning or milling.
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Not heat-treatable: Intended for as-rolled applications or surface treatment only.
Typical Applications
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Fasteners, bushings, shafts
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Turned precision parts
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Automotive and electronics components
Conclusion
11SMnPb30 offers a perfect balance of easy machining and reliable strength for medium-duty precision parts. Its unique chemistry supports high productivity in automated machining processes. For cost-effective and stable production, 11SMnPb30 remains a smart choice.
