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Technical Specifications
Product Overview
Metallurgical Characteristics
ASTM A572 Grade 50 is a high-strength, low-alloy (HSLA) structural steel that achieves its superior mechanical properties through controlled rolling and microalloying techniques. The steel features a fine-grained ferrite-pearlite microstructure with precipitation strengthening from vanadium, niobium, and titanium carbides and nitrides. This metallurgical design provides an optimal balance of strength, toughness, and weldability.
Manufacturing Process
MetalZenith produces ASTM A572 Grade 50 using advanced electric arc furnace technology followed by ladle refining and continuous casting. The steel undergoes controlled rolling in the austenite recrystallization and non-recrystallization temperature ranges, followed by accelerated cooling to achieve optimal grain refinement. Our thermomechanical controlled processing (TMCP) ensures consistent mechanical properties and enhanced toughness while maintaining excellent weldability characteristics.
Heat Treatment Options
ASTM A572 Grade 50 is typically supplied in the as-rolled condition, providing optimal mechanical properties without additional heat treatment. For specific applications requiring stress relief, the steel can be heat treated at 580-650°C for 1-2 hours per 25mm of thickness. Normalizing at 900-950°C followed by air cooling can be performed to refine grain structure and improve toughness for critical applications.
Welding Characteristics
The steel exhibits excellent weldability with all common welding processes including SMAW, GMAW, FCAW, and SAW. The low carbon equivalent (CE ≤ 0.45) minimizes the risk of cold cracking and reduces preheating requirements. For sections thicker than 25mm, preheating to 100-150°C is recommended. Post-weld heat treatment is generally not required for most structural applications.
Quality Standards & Testing
MetalZenith maintains comprehensive quality control throughout the manufacturing process, including real-time chemical composition monitoring, mechanical property verification, and non-destructive testing. All products undergo ultrasonic testing, dimensional inspection, and surface quality assessment. Our quality management system complies with ISO 9001:2015, ISO 14001, and OHSAS 18001 standards, ensuring consistent product quality and full traceability documentation.
🧪 Chemical Composition
| Element | Composition (%) | Notes |
|---|---|---|
| Carbon (C) | ≤ 0.23 | Maximum |
| Manganese (Mn) | 1.35 max | Strength enhancement |
| Phosphorus (P) | ≤ 0.030 | Maximum |
| Sulfur (S) | ≤ 0.030 | Maximum |
| Silicon (Si) | 0.40 max | Deoxidizer |
| Copper (Cu) | 0.35 max | Corrosion resistance |
| Nickel (Ni) | 0.40 max | Toughness improvement |
| Chromium (Cr) | 0.30 max | Hardenability |
| Molybdenum (Mo) | 0.15 max | Strength enhancement |
| Vanadium (V) | 0.10 max | Grain refinement |
| Niobium (Nb) | 0.05 max | Precipitation strengthening |
| Titanium (Ti) | 0.15 max | Grain refinement |
⚙️ Mechanical Properties
| Property | Value | Test Method |
|---|---|---|
| Yield Strength (0.2% offset) | ≥ 345 MPa (50 ksi) | ASTM A370 |
| Tensile Strength | 450-590 MPa (65-85 ksi) | ASTM A370 |
| Elongation in 200mm | ≥ 18% | ASTM A370 |
| Elongation in 50mm | ≥ 21% | ASTM A370 |
| Brinell Hardness | 170-220 HB | ASTM E10 |
| Charpy V-Notch Impact (20°C) | ≥ 27 J (20 ft-lb) | ASTM A370 |
| Charpy V-Notch Impact (-40°C) | ≥ 20 J (15 ft-lb) | ASTM A370 |
| Fatigue Limit (10&sup7; cycles) | 160-180 MPa | ASTM D7791 |
| Reduction of Area | ≥ 50% | ASTM A370 |
| Young's Modulus | 200-210 GPa | ASTM E111 |
| Shear Modulus | 80-85 GPa | ASTM E143 |
| Poisson's Ratio | 0.27-0.30 | ASTM E132 |
🔬 Physical Properties
| Property | Value | Temperature |
|---|---|---|
| Density | 7.85 g/cm³ | 20°C |
| Melting Point | 1510-1540°C | - |
| Thermal Conductivity | 54 W/m·K | 20°C |
| Thermal Conductivity | 35 W/m·K | 500°C |
| Specific Heat Capacity | 500 J/kg·K | 20°C |
| Thermal Expansion Coefficient | 12×10-6/K | 20-100°C |
| Thermal Expansion Coefficient | 14×10-6/K | 20-500°C |
| Electrical Resistivity | 0.16 µΩ·m | 20°C |
| Magnetic Permeability | Ferromagnetic | 20°C |
| Curie Temperature | 770°C | - |
| Thermal Diffusivity | 13.8 mm²/s | 20°C |
| Emissivity | 0.85-0.95 | Oxidized surface |
📏 Product Specifications
| Specification | Available Options | Standards |
|---|---|---|
| Product Forms | Plates, Sheets, Bars, Beams, Channels, Angles, Tubes | ASTM A572 |
| Plate Thickness | 6-200mm (0.25-8 inches) | ASTM A572 |
| Sheet Thickness | 1.5-6mm (0.06-0.25 inches) | ASTM A572 |
| Bar Diameter | 10-300mm (0.4-12 inches) | ASTM A572 |
| Standard Widths | 1000-3000mm (40-120 inches) | ASTM A6 |
| Standard Lengths | 6000-12000mm (20-40 feet) | ASTM A6 |
| Surface Finish | Hot Rolled, Cold Rolled, Pickled, Shot Blasted | ASTM A6 |
| Edge Condition | Mill Edge, Slit Edge, Sheared Edge | ASTM A6 |
| Thickness Tolerance | ±0.3mm (±0.012 inches) | ASTM A6 |
| Width Tolerance | ±3mm (±0.125 inches) | ASTM A6 |
| Length Tolerance | ±6mm (±0.25 inches) | ASTM A6 |
| Flatness | 5mm/m maximum deviation | ASTM A6 |
| International Standards | ASTM A572, EN 10025-2 (S355), JIS G3106 (SM490) | Multiple |
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Our Advantages in Processing ASTM A572 Grade 50
Advanced Thermomechanical Processing
MetalZenith employs cutting-edge controlled rolling and accelerated cooling technologies to achieve optimal grain refinement and precipitation strengthening. Our proprietary heat treatment processes ensure consistent mechanical properties and enhanced toughness while maintaining excellent weldability characteristics.
Comprehensive Quality Control System
Our integrated quality management system features real-time chemical composition monitoring, automated mechanical testing, and advanced non-destructive testing capabilities. Every product undergoes rigorous inspection protocols including ultrasonic testing, dimensional verification, and surface quality assessment to guarantee compliance with international standards.
Flexible Customization & Global Supply
MetalZenith offers extensive customization options including special dimensions, surface treatments, and mechanical property modifications. Our global distribution network and strategic inventory locations ensure rapid delivery worldwide, while our technical support team provides comprehensive engineering assistance for specific application requirements.
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