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Technical Specifications
Product Overview
Metallurgical Characteristics
SK7 is a high carbon structural steel with a predominantly pearlitic microstructure in the annealed condition. The high carbon content provides excellent strength and hardness potential, while controlled manganese and silicon additions enhance hardenability and deoxidation. The fine-grained structure achieved through MetalZenith's controlled rolling process ensures optimal mechanical properties for structural applications.
Heat Treatment Process
MetalZenith employs precise heat treatment protocols including annealing at 740-760°C for optimal machinability, normalization at 850-870°C for structural applications, and quenching and tempering processes for enhanced strength. Our controlled cooling rates and tempering temperatures are optimized to achieve the ideal balance of strength, toughness, and workability required for structural components.
Advanced Manufacturing Process
Our SK7 production utilizes electric arc furnace melting with secondary refining to achieve precise chemical composition control. The steel undergoes controlled rolling with optimized reduction schedules to refine grain structure and enhance mechanical properties. MetalZenith's continuous casting and rolling facilities ensure consistent quality and dimensional accuracy throughout production.
Specialized Quality Testing
SK7 steel undergoes comprehensive testing protocols specific to structural applications. Weldability testing includes preheating temperature determination and HAZ toughness evaluation. Formability assessment covers bend testing and deep drawing characteristics. Fatigue strength testing simulates cyclic loading conditions typical in structural applications. Atmospheric corrosion resistance testing ensures long-term durability in various environmental conditions.
Structural Application Engineering
For building structures, SK7 provides excellent load-bearing capacity with superior weldability for connection details. In bridge engineering, the material's fatigue resistance and atmospheric corrosion properties ensure long service life under dynamic loading. Mechanical manufacturing applications benefit from the steel's machinability and heat treatment response. Vehicle manufacturing utilizes SK7's formability and crash energy absorption characteristics. General engineering applications leverage the material's versatility and consistent mechanical properties across various processing conditions.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.65 - 0.75 |
| Manganese (Mn) | 0.60 - 0.90 |
| Silicon (Si) | 0.15 - 0.35 |
| Phosphorus (P) | ≤ 0.030 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | ≤ 0.25 |
| Nickel (Ni) | ≤ 0.25 |
| Copper (Cu) | ≤ 0.30 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Yield Strength (MPa) | ≥ 355 |
| Tensile Strength (MPa) | 680 - 830 |
| Elongation (%) | ≥ 12 |
| Impact Energy at 20°C (J) | ≥ 35 |
| Hardness (HRC) | 20 - 25 (Annealed) |
| Fatigue Strength (MPa) | ≥ 300 |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density (g/cm3) | 7.85 |
| Melting Point (°C) | 1460 - 1520 |
| Thermal Conductivity (W/m·K) | 42.7 |
| Thermal Expansion (×10??/K) | 11.5 |
| Elastic Modulus (GPa) | 210 |
| Poisson's Ratio | 0.27 - 0.30 |
📏 Product Specifications
| Specification | Details |
|---|---|
| Available Forms | Plates, Sheets, Bars, Rods, Structural Sections |
| Thickness Range | 3 - 80mm |
| Width Range | 500 - 3000mm |
| Length Range | 3000 - 12000mm |
| Standards Compliance | JIS G4401, ASTM A684, EN C70 |
| Heat Treatment Condition | Annealed, Normalized, Q&T Available |
| Surface Finish | Hot Rolled, Cold Drawn, Machined |
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Our Advantages in Processing SK7 Steel
Advanced Heat Treatment Technology
MetalZenith utilizes precision-controlled quenching and tempering processes with computerized temperature monitoring to achieve optimal hardness and toughness balance. Our advanced heat treatment facilities ensure uniform microstructure and consistent mechanical properties throughout the material thickness, critical for structural applications.
Comprehensive Structural Testing
Our SK7 steel undergoes extensive testing protocols including weldability assessment, formability evaluation, fatigue strength testing, and atmospheric corrosion resistance analysis. MetalZenith's quality assurance program ensures superior performance in demanding structural environments with complete traceability and certification.
Custom Processing & Engineering Support
MetalZenith provides comprehensive custom processing services including precision cutting, forming, and heat treatment to customer specifications. Our technical team offers expert engineering support for structural design optimization and material selection, ensuring optimal performance in building, bridge, and mechanical applications.
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