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Technical Specifications
Product Overview
Metallurgical Characteristics
ASTM A709 Grade 50 is a high-strength low-alloy (HSLA) structural steel engineered through controlled chemical composition and thermomechanical processing. The steel achieves its superior properties through fine-grain microstructure development, precipitation strengthening, and optimized carbide distribution. MetalZenith's advanced steelmaking process ensures consistent austenite grain size control and uniform mechanical properties throughout the material cross-section.
Heat Treatment & Processing
Our manufacturing process utilizes controlled rolling in the austenite-ferrite transformation region, followed by accelerated cooling to achieve optimal strength-toughness balance. The steel is typically supplied in the hot-rolled condition with normalized microstructure. Optional heat treatments include stress relieving at 580-650°C and normalizing at 900-950°C for enhanced dimensional stability and improved machinability.
Welding Characteristics
ASTM A709 Grade 50 exhibits excellent weldability with proper procedures and preheating when required. The steel's low carbon equivalent (CE) ensures minimal heat-affected zone (HAZ) hardening and reduced susceptibility to hydrogen-induced cracking. MetalZenith recommends AWS D1.5 Bridge Welding Code procedures with appropriate electrode selection and interpass temperature control for optimal joint performance.
Quality Standards & Testing
Every heat undergoes comprehensive testing including ladle analysis, product analysis, tensile testing, Charpy V-notch impact testing, and ultrasonic examination. MetalZenith maintains AISC certification and follows AASHTO M270 requirements for bridge steel applications. Our quality management system ensures full traceability from raw materials through final delivery, with complete documentation packages including chemical analysis, mechanical test results, and dimensional inspection reports.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | ≤ 0.23 |
| Manganese (Mn) | ≤ 1.35 |
| Silicon (Si) | 0.15 - 0.50 |
| Phosphorus (P) | ≤ 0.030 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | ≤ 0.65 |
| Nickel (Ni) | ≤ 0.50 |
| Molybdenum (Mo) | ≤ 0.20 |
| Copper (Cu) | ≤ 0.35 |
| Vanadium (V) | ≤ 0.05 |
| Niobium (Nb) | ≤ 0.05 |
| Titanium (Ti) | ≤ 0.06 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Minimum Yield Strength | 345 MPa (50 ksi) |
| Tensile Strength | 450-620 MPa (65-90 ksi) |
| Elongation in 200mm | ≥ 18% |
| Elongation in 50mm | ≥ 21% |
| Charpy V-Notch Impact Energy (at 21°C) | ≥ 27 J (20 ft-lbf) |
| Charpy V-Notch Impact Energy (at -34°C) | ≥ 27 J (20 ft-lbf) |
| Brinell Hardness | 170-230 HB |
| Young's Modulus | 200 GPa |
| Shear Modulus | 80 GPa |
| Poisson's Ratio | 0.30 |
| Fatigue Limit (10&sup7; cycles) | 165 MPa |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Melting Point | 1510°C |
| Thermal Conductivity (at 20°C) | 50 W/m·K |
| Thermal Expansion Coefficient (20-100°C) | 12×10-6/K |
| Specific Heat Capacity | 460 J/kg·K |
| Electrical Resistivity | 0.18 µΩ·m |
| Magnetic Permeability | Ferromagnetic |
| Curie Temperature | 770°C |
| Thermal Diffusivity | 13.8 mm²/s |
| Emissivity (oxidized surface) | 0.79 |
📏 Product Specifications
| Specification | Available Options |
|---|---|
| Product Forms | Plates, Sheets, Bars, Beams, Channels, Angles |
| Plate Thickness | 6mm - 150mm (0.25' - 6') |
| Sheet Thickness | 1mm - 6mm (0.04' - 0.25') |
| Width Range | 1000mm - 4000mm (40' - 160') |
| Length Range | 2000mm - 18000mm (80' - 720') |
| Surface Finish | Hot Rolled, Normalized, Shot Blasted, Pickled |
| Edge Condition | Mill Edge, Sheared Edge, Flame Cut, Plasma Cut |
| Dimensional Tolerance | ASTM A6/A6M Standard |
| Standards Compliance | ASTM A709, AASHTO M270, AWS D1.5 |
| Testing Certificates | Mill Test Certificate, EN 10204 3.1/3.2 |
| Special Requirements | Fracture Critical, Charpy V-Notch, Z-direction |
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Our Advantages in Processing ASTM A709 Grade 50
Advanced Controlled Rolling Technology
MetalZenith employs sophisticated thermomechanical controlled processing (TMCP) technology that optimizes grain structure refinement and precipitation hardening. Our computer-controlled rolling mills ensure precise temperature control and deformation schedules, resulting in superior mechanical properties and enhanced toughness compared to conventional processing methods.
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 heat undergoes rigorous Charpy V-notch impact testing, tensile testing, and ultrasonic examination to guarantee consistent performance and reliability in critical structural applications.
Global Supply Chain & Custom Solutions
MetalZenith maintains strategic inventory locations worldwide and offers extensive customization capabilities including precision cutting, heat treatment, and surface preparation services. Our engineering team provides technical support for material selection and application-specific modifications, ensuring optimal performance for each customer's unique requirements.
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