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Technical Specifications
Product Overview
Metallurgical Characteristics
Free Cutting Steel features a carefully engineered microstructure with controlled sulfide inclusions distributed throughout a ferritic-pearlitic matrix. The strategic addition of sulfur and phosphorus creates favorable chip formation characteristics while maintaining adequate structural properties. Lead additions further enhance machinability by acting as a lubricant during cutting operations, reducing tool wear and improving surface finish quality.
Heat Treatment Process
MetalZenith employs controlled cooling from rolling temperature followed by optional stress relief annealing at 550-650°C. For enhanced machinability, spheroidizing annealing at 680-720°C may be applied to optimize carbide morphology. Our precise temperature control and atmosphere management ensure consistent microstructure development while preserving the beneficial sulfide distribution essential for superior cutting performance.
Advanced Manufacturing Process
Our production process incorporates advanced ladle metallurgy with calcium treatment to control inclusion shape and distribution. Continuous casting with electromagnetic stirring ensures uniform sulfur distribution, while controlled rolling parameters optimize the final microstructure. Post-rolling cooling strategies are tailored to achieve the ideal balance between machinability and structural integrity.
Specialized Quality Testing
MetalZenith conducts comprehensive testing including machinability evaluation using standardized cutting tests, welding performance assessment through bend and tensile testing of welded joints, forming capability verification through bend testing and hole expansion tests, fatigue strength evaluation under cyclic loading conditions, and atmospheric corrosion resistance testing in accelerated weathering environments to ensure reliable long-term performance.
Structural Application Considerations
For building structures, Free Cutting Steel provides excellent machinability for connection details while maintaining adequate strength for secondary structural members. In bridge engineering applications, the material excels in fabricated connection elements requiring precise machining. Mechanical manufacturing benefits from reduced machining time and improved surface finish, while vehicle manufacturing applications leverage the combination of formability and machinability for complex chassis components. General engineering applications utilize the material's versatility for components requiring both structural integrity and extensive machining operations.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.08 - 0.13 |
| Manganese (Mn) | 0.60 - 0.90 |
| Silicon (Si) | 0.15 - 0.35 |
| Phosphorus (P) | 0.04 - 0.09 |
| Sulfur (S) | 0.08 - 0.13 |
| Lead (Pb) | 0.15 - 0.35 |
| Iron (Fe) | Balance |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Yield Strength (MPa) | ≥ 275 |
| Tensile Strength (MPa) | 415 - 550 |
| Elongation (%) | ≥ 22 |
| Impact Energy at 20°C (J) | ≥ 27 |
| Hardness (HB) | 120 - 170 |
| Fatigue Strength (MPa) | 180 - 220 |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density (g/cm3) | 7.87 |
| Melting Point (°C) | 1510 - 1540 |
| Thermal Conductivity (W/m·K) | 49.8 |
| Thermal Expansion (×10??/K) | 11.7 |
| Elastic Modulus (GPa) | 200 |
| Poisson's Ratio | 0.27 - 0.30 |
📏 Product Specifications
| Specification | Details |
|---|---|
| Available Forms | Bars, Rods, Plates, Sheets, Structural Sections |
| Diameter Range | 6 - 300mm |
| Thickness Range | 3 - 80mm |
| Length Range | 3000 - 12000mm |
| Standards Compliance | ASTM A108, SAE 1212, EN 10277 |
| Surface Condition | Hot Rolled, Cold Drawn, Turned & Polished |
| Machinability Rating | 100% (Reference Standard) |
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Our Advantages in Processing Free Cutting Steel
Precision Sulfur Distribution Technology
MetalZenith utilizes advanced ladle metallurgy and controlled cooling processes to achieve optimal sulfur distribution and inclusion morphology. Our proprietary technology ensures consistent machinability while maintaining structural integrity through precise control of sulfide formation and distribution patterns.
Comprehensive Structural Performance Testing
Our quality assurance program includes specialized testing for structural applications: welding performance evaluation, forming capability assessment, fatigue strength testing under cyclic loading, and atmospheric corrosion resistance verification to ensure reliable performance in demanding structural environments.
Custom Machining Solutions & Technical Support
MetalZenith provides comprehensive technical support including custom heat treatment schedules, optimized cutting parameter recommendations, and specialized forming processes. Our engineering team works closely with customers to develop tailored solutions for complex structural components requiring extensive machining operations.
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