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Technical Specifications
Product Overview
Metallurgical Characteristics
738H is a quenched and tempered high-strength structural steel with a predominantly tempered martensitic microstructure. The controlled addition of chromium, molybdenum, and boron enhances hardenability and provides excellent strength-to-weight ratio. The fine-grained microstructure achieved through controlled heat treatment ensures superior mechanical properties and structural integrity.
Heat Treatment Process
MetalZenith employs precision austenitizing at 900-930°C followed by controlled water quenching and tempering at 580-650°C. This optimized heat treatment cycle produces the ideal balance of strength, toughness, and ductility required for structural applications. Our computer-controlled furnaces ensure uniform heating and precise temperature control throughout the process.
Manufacturing Process Excellence
Our advanced manufacturing process includes electric arc furnace melting, ladle refining, and continuous casting followed by controlled rolling. MetalZenith's state-of-the-art facilities ensure consistent chemical composition, minimal segregation, and optimal mechanical properties. Quality control includes real-time monitoring of all critical process parameters.
Structural Performance Testing
738H undergoes comprehensive testing including welding performance evaluation using multiple welding processes, forming capability assessment through bend testing, fatigue strength testing under cyclic loading conditions, and atmospheric corrosion resistance testing. These specialized tests ensure optimal performance in demanding structural environments.
Application Engineering Considerations
For building construction applications, 738H provides excellent seismic resistance and load-bearing capacity. In bridge engineering, its superior fatigue resistance ensures long-term structural integrity under dynamic loading. For machinery manufacturing, the steel's high strength enables weight reduction while maintaining structural performance. In vehicle construction, 738H offers crash resistance and durability. General engineering applications benefit from its excellent weldability and forming characteristics.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.15 - 0.21 |
| Manganese (Mn) | 0.80 - 1.10 |
| Silicon (Si) | 0.20 - 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) | ≥ 345 |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density (g/cm3) | 7.85 |
| Melting Point (°C) | 1480 - 1520 |
| Thermal Conductivity (W/m·K) | 44.5 |
| 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, Forgings |
| Thickness Range | 6 - 150mm |
| Width Range | 1200 - 4200mm |
| Length Range | 6000 - 20000mm |
| Standards Compliance | ASTM A514, EN 10025-6, JIS G3106 |
| Heat Treatment Condition | Quenched and Tempered |
| Surface Finish | Hot Rolled, Shot Blasted, Pickled |
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Our Advantages in Processing 738H Steel
Advanced Quenching & Tempering Technology
MetalZenith utilizes precision-controlled quenching and tempering processes with real-time temperature monitoring and controlled cooling rates to achieve optimal martensitic transformation and subsequent tempering. Our advanced heat treatment ensures uniform microstructure and consistent mechanical properties throughout the material thickness.
Comprehensive Structural Performance Testing
Our 738H steel undergoes extensive structural-specific testing including welding performance evaluation, forming capability assessment, fatigue strength testing, and atmospheric corrosion resistance analysis. This comprehensive testing protocol ensures optimal performance in demanding structural applications.
Custom Structural Solutions & Engineering Support
MetalZenith provides tailored structural steel solutions with custom heat treatment, precision cutting, and forming services. Our technical team offers comprehensive engineering support including structural design consultation, welding procedure development, and application-specific material optimization.
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