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Technical Specifications
Product Overview
Metallurgical Characteristics
SA516 Grade 70 is a carbon-manganese steel with a ferritic-pearlitic microstructure optimized for pressure vessel applications. The controlled carbon content (≤0.30%) ensures excellent weldability while maintaining adequate strength. The manganese content (0.85-1.20%) provides solid solution strengthening and improves hardenability. Fine grain structure achieved through controlled rolling enhances toughness and impact resistance.
Heat Treatment Process
MetalZenith employs precise heat treatment protocols including controlled cooling from rolling temperature or normalizing at 900-950°C followed by air cooling. Stress relief heat treatment at 580-650°C may be applied for thick sections or complex geometries. Our advanced furnace control systems ensure uniform temperature distribution and optimal microstructural development.
Manufacturing Process Excellence
Production begins with carefully selected raw materials melted in electric arc furnaces with ladle refining for precise chemistry control. Continuous casting produces high-quality billets with minimal segregation. Hot rolling is performed with controlled finishing temperatures to achieve optimal grain size. Advanced process monitoring ensures consistent mechanical properties throughout the entire production run.
Quality Standards & Testing
All SA516 Grade 70 products undergo comprehensive testing per ASTM A516 requirements including chemical analysis, tensile testing, Charpy impact testing, and ultrasonic examination. Additional testing includes hardness verification, macro-etch examination, and grain size determination. Third-party inspection services and witness testing are available. Complete documentation includes mill test certificates, heat treatment charts, and traceability records.
Welding Considerations
SA516 Grade 70 exhibits excellent weldability with low carbon equivalent (typically 0.40-0.45%). Preheating is generally not required for sections up to 25mm thickness. Post-weld heat treatment may be specified for stress relief. Compatible welding consumables include E7018, ER70S-6, and similar low-hydrogen electrodes. Proper welding procedures ensure full penetration and optimal joint properties.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | ≤ 0.30 |
| Manganese (Mn) | 0.85 - 1.20 |
| Silicon (Si) | 0.13 - 0.45 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.035 |
| Chromium (Cr) | ≤ 0.30 |
| Nickel (Ni) | ≤ 0.30 |
| Molybdenum (Mo) | ≤ 0.12 |
| Copper (Cu) | ≤ 0.35 |
| Vanadium (V) | ≤ 0.08 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 485 - 620 MPa |
| Yield Strength (0.2% offset) | ≥ 260 MPa |
| Elongation (50mm gauge) | ≥ 21% |
| Elongation (200mm gauge) | ≥ 17% |
| Brinell Hardness (HB) | 143 - 187 |
| Charpy V-Notch Impact (at 0°C) | ≥ 27 J |
| Young's Modulus | 200 - 210 GPa |
| Poisson's Ratio | 0.27 - 0.30 |
| Fatigue Limit (10&sup7; cycles) | 240 - 280 MPa |
| Reduction of Area | ≥ 38% |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Melting Point | 1510 - 1540°C |
| Thermal Conductivity (at 20°C) | 54 W/m·K |
| Thermal Expansion Coefficient (20-100°C) | 12.0×10-6/K |
| Thermal Expansion Coefficient (20-400°C) | 13.5×10-6/K |
| Specific Heat Capacity | 500 J/kg·K |
| Electrical Resistivity (at 20°C) | 0.16 µΩ·m |
| Magnetic Permeability | Ferromagnetic |
| Curie Temperature | 770°C |
| Thermal Diffusivity | 13.7 mm²/s |
📏 Product Specifications
| Specification | Available Options |
|---|---|
| Product Forms | Plates, Sheets, Bars, Forgings, Pipes |
| Plate Thickness | 6mm - 200mm |
| Sheet Thickness | 0.5mm - 6mm |
| Width Range | 1000mm - 4000mm |
| Length Range | 2000mm - 12000mm |
| Standards Compliance | ASTM A516, ASME SA516, EN 10028-2 (P355GH) |
| Surface Finish | Hot Rolled, Normalized, Shot Blasted |
| Dimensional Tolerance | ASTM A6/A6M, EN 10029 Class A/B |
| Edge Condition | Mill Edge, Sheared Edge, Flame Cut |
| Heat Treatment | As Rolled, Normalized, Stress Relieved |
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Our Advantages in Processing SA516 Grade 70
Advanced Metallurgical Control
MetalZenith employs sophisticated electric arc furnace technology with precise ladle refining to achieve optimal chemical composition and microstructure. Our controlled rolling and normalizing processes ensure consistent mechanical properties and superior grain refinement for enhanced toughness and weldability.
Comprehensive Quality Testing
Every SA516 Grade 70 product undergoes extensive quality verification including spectroscopic analysis, tensile testing, Charpy impact testing, and ultrasonic inspection. Our ISO 9001:2015 certified laboratory ensures compliance with ASTM A516 and international pressure vessel standards.
Custom Manufacturing Solutions
MetalZenith offers flexible production capabilities including custom heat treatment cycles, specific dimensional tolerances, and specialized surface finishes. Our global supply chain network ensures timely delivery worldwide with comprehensive technical support and engineering consultation services.
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