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Technical Specifications
Product Overview
Metallurgical Characteristics
738 steel features a tempered martensitic microstructure achieved through controlled quenching and tempering processes. The optimized alloy composition with chromium, molybdenum, and boron additions provides exceptional hardenability and strength while maintaining excellent toughness. The fine-grained structure ensures superior fatigue resistance and impact properties essential for structural applications.
Heat Treatment Process
MetalZenith employs precision austenitizing at 870-900°C followed by controlled water quenching and tempering at 580-650°C. This optimized heat treatment cycle ensures uniform mechanical properties and stress relief while maintaining the high strength characteristics required for structural applications.
Advanced Manufacturing Process
Our state-of-the-art production facility utilizes electric arc furnace melting with secondary refining, continuous casting, and controlled rolling processes. Advanced quality control systems monitor chemical composition, temperature profiles, and mechanical properties throughout production to ensure consistent high-quality structural steel.
Specialized Quality Testing
Comprehensive testing protocols include welding performance evaluation per AWS D1.1 standards, forming capability assessment through bend testing, fatigue strength analysis using rotating beam testing, and atmospheric corrosion resistance evaluation. These specialized tests ensure optimal performance in demanding structural environments.
Structural Application Engineering
For building construction applications, 738 steel provides exceptional load-bearing capacity with reduced weight compared to conventional grades. In bridge engineering, the superior fatigue resistance ensures long-term durability under cyclic loading. For machinery manufacturing and vehicle construction, the excellent weldability and formability enable complex structural designs while maintaining structural integrity in general engineering applications.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.15 - 0.21 |
| Manganese (Mn) | 0.80 - 1.10 |
| Silicon (Si) | 0.15 - 0.35 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.035 |
| Chromium (Cr) | 0.40 - 0.65 |
| Molybdenum (Mo) | 0.15 - 0.25 |
| Boron (B) | 0.0005 - 0.006 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Yield Strength (MPa) | ≥ 690 |
| Tensile Strength (MPa) | 760 - 895 |
| Elongation (%) | ≥ 18 |
| Impact Energy at -40°C (J) | ≥ 34 |
| Hardness (HB) | 235 - 285 |
| Fatigue Strength (MPa) | 310 - 350 |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density (g/cm3) | 7.85 |
| Melting Point (°C) | 1480 - 1520 |
| Thermal Conductivity (W/m·K) | 42.7 |
| Thermal Expansion (×10??/K) | 12.3 |
| Elastic Modulus (GPa) | 200 |
| Poisson's Ratio | 0.27 - 0.30 |
📏 Product Specifications
| Specification | Details |
|---|---|
| Available Forms | Plates, Beams, Channels, Angles, Bars, Custom Sections |
| Thickness Range | 6 - 150mm |
| Width Range | 1200 - 4200mm |
| Length Range | 6000 - 20000mm |
| Standards Compliance | ASTM A514, AWS D1.1, EN 10025-6 |
| Heat Treatment Condition | Quenched and Tempered |
| Surface Finish | Hot Rolled, Shot Blasted, Pickled |
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Our Advantages in Processing 738 Steel
Advanced Quenching & Tempering Process
MetalZenith utilizes precision-controlled quenching and tempering with real-time temperature monitoring to achieve optimal microstructure and enhanced mechanical properties. Our advanced heat treatment process ensures consistent high strength and toughness throughout the material cross-section, critical for structural applications.
Comprehensive Structural Performance Testing
Our rigorous quality assurance includes specialized testing for welding performance evaluation, forming capability assessment, fatigue strength analysis, and atmospheric corrosion resistance testing. These comprehensive evaluations ensure optimal performance in demanding structural applications.
Custom Structural Solutions & Engineering Support
MetalZenith provides tailored structural steel solutions with custom dimensions, specialized heat treatment, and comprehensive technical support. Our engineering team offers application-specific recommendations for optimal structural design and fabrication processes.
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