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Technical Specifications
Product Overview
Metallurgical Characteristics
SA515 Grade 70 is a medium-carbon steel with a predominantly ferritic-pearlitic microstructure. The controlled carbon content and manganese addition provide optimal strength-to-ductility balance, while silicon acts as a deoxidizer and strengthening agent. The fine-grained structure achieved through controlled rolling enhances both mechanical properties and weldability.
Heat Treatment Process
MetalZenith employs normalized heat treatment for SA515 Grade 70, involving heating to 900-950°C followed by air cooling. This process refines the grain structure, relieves internal stresses, and ensures uniform mechanical properties throughout the material thickness. Stress relief annealing at 580-650°C may be applied for enhanced dimensional stability.
Manufacturing Process
Our integrated manufacturing process begins with electric arc furnace steelmaking using high-quality raw materials. The molten steel undergoes ladle refining for precise chemistry control and degassing. Continuous casting produces high-quality slabs, which are then hot-rolled using computer-controlled rolling mills with precise temperature and reduction schedules to achieve optimal mechanical properties.
Quality Standards and Testing
All SA515 Grade 70 products manufactured by MetalZenith comply with ASTM A515/A515M and ASME SA-515 specifications. Comprehensive testing includes chemical analysis by optical emission spectroscopy, tensile testing, Charpy impact testing, hardness measurement, and ultrasonic inspection for internal soundness. Mill test certificates and third-party inspection services are available upon request.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | ≤ 0.31 |
| Manganese (Mn) | 0.90-1.20 |
| Silicon (Si) | 0.13-0.45 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.035 |
| Chromium (Cr) | ≤ 0.25 |
| Nickel (Ni) | ≤ 0.25 |
| Molybdenum (Mo) | ≤ 0.08 |
| Copper (Cu) | ≤ 0.35 |
| Vanadium (V) | ≤ 0.02 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 485-620 MPa |
| Yield Strength (0.2% offset) | ≥ 260 MPa |
| Elongation in 200mm | ≥ 21% |
| Elongation in 50mm | ≥ 17% |
| Brinell Hardness (HB) | 137-187 |
| Charpy V-Notch Impact (at 0°C) | ≥ 27 J |
| Reduction of Area | ≥ 38% |
| Fatigue Limit (10^7 cycles) | 240 MPa |
| Modulus of Elasticity | 200 GPa |
| Poisson's Ratio | 0.27-0.30 |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Melting Point | 1510°C |
| Thermal Conductivity (at 100°C) | 54 W/m·K |
| Thermal Expansion Coefficient (20-100°C) | 12×10-6/K |
| Specific Heat Capacity | 500 J/kg·K |
| Electrical Resistivity | 0.16 µΩ·m |
| Magnetic Permeability | Ferromagnetic |
| Curie Temperature | 770°C |
| Thermal Diffusivity | 13.8 mm²/s |
| Maximum Service Temperature | 480°C |
📏 Product Specifications
| Specification | Available Options |
|---|---|
| Product Forms | Plates, Sheets, Coils, Cut-to-length |
| Thickness Range | 5mm - 200mm |
| Width Range | 1000mm - 4000mm |
| Length Range | 2000mm - 18000mm |
| Standards Compliance | ASTM A515/A515M, ASME SA-515 |
| Surface Finish | Hot Rolled, Normalized, Shot Blasted |
| Edge Condition | Mill Edge, Sheared Edge, Flame Cut |
| Thickness Tolerance | ±0.3mm (5-40mm), ±0.05×thickness (>40mm) |
| Width Tolerance | ±5mm |
| Length Tolerance | ±10mm |
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Our Advantages in Processing SA515 Grade 70
Advanced Controlled Rolling Technology
MetalZenith employs precision controlled rolling mills with advanced temperature monitoring systems to achieve optimal grain refinement and mechanical properties in SA515 Grade 70 steel, ensuring consistent strength and toughness throughout the material thickness.
Comprehensive Quality Testing Laboratory
Our state-of-the-art testing facility features advanced spectrometers, universal testing machines, and ultrasonic inspection equipment to verify chemical composition, mechanical properties, and internal soundness, guaranteeing compliance with ASTM A515 standards.
Custom Processing and Global Supply
MetalZenith offers extensive customization capabilities including precision cutting, heat treatment, and surface finishing services, supported by our global logistics network ensuring timely delivery of SA515 Grade 70 steel to customers worldwide.
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