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Technical Specifications
Product Overview
Metallurgical Characteristics
HSLA 420 features a fine-grained ferritic-pearlitic microstructure with controlled precipitation of microalloying carbides and nitrides. The strategic addition of niobium, vanadium, and titanium promotes grain refinement through precipitation strengthening and grain boundary pinning, resulting in superior strength-to-weight ratio while maintaining excellent formability and weldability characteristics essential for high-strength applications.
Heat Treatment Process
MetalZenith employs thermomechanical controlled processing (TMCP) with controlled rolling temperatures between 850-950°C followed by accelerated cooling to optimize microalloying precipitation. Alternative heat treatment includes normalization at 900-920°C with controlled cooling rates to achieve desired strength levels while preserving impact toughness and formability properties.
Manufacturing Process Excellence
MetalZenith's advanced manufacturing process incorporates precise chemical composition control, optimized reheating temperatures, and multi-pass controlled rolling with real-time microstructure monitoring. Our state-of-the-art facilities ensure consistent mechanical properties through automated process control and continuous quality monitoring systems.
Specialized Quality Testing
Comprehensive testing protocols include Erichsen cupping tests for formability assessment, simulated HAZ testing for welding performance evaluation, hydrogen-induced cracking (HIC) resistance testing per NACE TM0284, and delayed fracture testing under sustained loading conditions. Additional testing includes fatigue performance evaluation and stress corrosion cracking resistance assessment for critical applications.
Application-Specific Technical Considerations
For automotive manufacturing, HSLA 420 provides excellent crash energy absorption and weight reduction capabilities. In building construction, the high strength enables reduced section sizes and improved seismic performance. Bridge engineering applications benefit from superior fatigue resistance and weathering characteristics. Lifting equipment applications leverage the combination of high strength and impact toughness, while pressure vessel applications utilize the excellent through-thickness properties and hydrogen resistance.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | ≤ 0.26 |
| Manganese (Mn) | 1.35 - 1.65 |
| Silicon (Si) | 0.15 - 0.40 |
| Phosphorus (P) | ≤ 0.030 |
| Sulfur (S) | ≤ 0.030 |
| Niobium (Nb) | 0.005 - 0.050 |
| Vanadium (V) | 0.01 - 0.15 |
| Titanium (Ti) | 0.006 - 0.024 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Yield Strength (MPa) | ≥ 420 |
| Tensile Strength (MPa) | 520 - 670 |
| Elongation (%) | ≥ 18 |
| Impact Energy at -20°C (J) | ≥ 27 |
| Fatigue Strength (MPa) | 210 - 250 |
| Hardness (HB) | 140 - 190 |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density (g/cm3) | 7.85 |
| 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 | Plates, Sheets, Coils, Bars, Structural Shapes |
| Thickness Range | 1.5 - 80mm |
| Width Range | 1000 - 3200mm |
| Length Range | 6000 - 15000mm |
| Standards Compliance | ASTM A572 Grade 420, ASTM A709 Grade 420 |
| Heat Treatment Condition | Hot Rolled, TMCP, Normalized |
| Surface Finish | Mill Scale, Pickled, Shot Blasted |
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Our Advantages in Processing HSLA 420 Steel
Advanced Thermomechanical Processing
MetalZenith employs precision-controlled thermomechanical processing with real-time temperature and deformation monitoring to achieve optimal microalloying precipitation and grain refinement. Our advanced TMCP technology ensures consistent high strength properties while maintaining excellent formability and weldability throughout the material thickness.
Comprehensive High-Strength Testing Protocol
MetalZenith conducts specialized testing protocols for high-strength steels including advanced formability testing (Erichsen cupping, bend testing), welding performance evaluation (HAZ toughness, weld metal properties), hydrogen-induced cracking resistance testing, and delayed fracture assessment to ensure optimal performance in demanding applications.
Custom Engineering Solutions
MetalZenith provides comprehensive custom processing services including precision cutting, forming, heat treatment optimization, and application-specific property enhancement. Our technical team offers expert consultation for automotive lightweighting, structural optimization, and pressure vessel design to maximize HSLA 420 performance benefits.
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