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Technical Specifications
Product Overview
Metallurgical Characteristics
AISI 8620 is a low-carbon nickel-chromium-molybdenum alloy steel specifically designed for carburizing applications. The carefully balanced alloy composition provides excellent hardenability while maintaining good machinability in the annealed condition. The presence of nickel and chromium enhances core toughness and case hardness penetration, while molybdenum improves tempering resistance and reduces temper brittleness.
Heat Treatment Process
MetalZenith's heat treatment process for AISI 8620 begins with normalizing at 900-950°C followed by air cooling to refine grain structure. Carburizing is performed at 900-930°C in a controlled carbon potential atmosphere to achieve case depths of 0.8-2.0mm. Direct quenching from carburizing temperature or reheat quenching at 820-850°C followed by tempering at 150-200°C optimizes the balance between case hardness and core toughness.
Manufacturing Process Excellence
Our integrated manufacturing process begins with electric arc furnace melting using premium scrap and alloy additions. Secondary refining through ladle metallurgy and vacuum degassing ensures low inclusion content and precise chemistry control. Continuous casting produces high-quality billets that undergo controlled rolling in our modern mill complex. Post-rolling heat treatment and precision finishing operations deliver products meeting the most demanding specifications.
Quality Standards and Testing
MetalZenith maintains strict quality control throughout production, with comprehensive testing including chemical analysis by optical emission spectroscopy, mechanical testing per ASTM A370, ultrasonic inspection for internal soundness, and metallographic examination. Our quality management system complies with ISO 9001:2015, IATF 16949, and customer-specific requirements. Complete traceability documentation and mill test certificates accompany every shipment, ensuring full compliance with international standards and customer specifications.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.18 - 0.23 |
| Manganese (Mn) | 0.70 - 1.00 |
| Silicon (Si) | 0.15 - 0.35 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.040 |
| Chromium (Cr) | 0.40 - 0.70 |
| Nickel (Ni) | 0.40 - 0.70 |
| Molybdenum (Mo) | 0.15 - 0.25 |
| Copper (Cu) | ≤ 0.35 |
| Aluminum (Al) | 0.020 - 0.050 |
⚙️ Mechanical Properties
| Property | Value | Condition |
|---|---|---|
| Tensile Strength | 850 - 1000 MPa | Normalized |
| Yield Strength (0.2% offset) | ≥ 550 MPa | Normalized |
| Elongation | ≥ 18% | In 50mm gauge length |
| Reduction of Area | ≥ 50% | Normalized |
| Hardness (Brinell) | 248 - 302 HB | Normalized |
| Impact Energy (Charpy V-notch) | ≥ 54 J | At 20°C |
| Case Hardness (after carburizing) | 58 - 63 HRC | Surface layer |
| Core Hardness (after heat treatment) | 30 - 40 HRC | Center |
| Fatigue Limit | 400 - 450 MPa | 10&sup7; cycles |
🔬 Physical Properties
| Property | Value | Temperature |
|---|---|---|
| Density | 7.85 g/cm³ | 20°C |
| Melting Point | 1420 - 1460°C | - |
| Thermal Conductivity | 44.5 W/m·K | 20°C |
| Thermal Expansion Coefficient | 12.1×10-6/K | 20-100°C |
| Specific Heat Capacity | 486 J/kg·K | 20°C |
| Electrical Resistivity | 0.22 µΩ·m | 20°C |
| Modulus of Elasticity | 207 GPa | 20°C |
| Poisson's Ratio | 0.27 - 0.30 | 20°C |
| Magnetic Permeability | Ferromagnetic | 20°C |
📏 Product Specifications
| Specification | Available Options | Standards |
|---|---|---|
| Product Forms | Round bars, square bars, flat bars, plates, forgings, rings | ASTM A29, A322 |
| Round Bar Diameter | 6mm - 500mm | ASTM A29 |
| Square Bar Size | 10mm - 200mm | ASTM A29 |
| Plate Thickness | 8mm - 150mm | ASTM A29 |
| Length | Up to 12 meters (standard), custom lengths available | Customer specification |
| Surface Finish | Hot rolled, cold drawn, peeled, ground, machined | ASTM A29 |
| Dimensional Tolerance | ±0.5mm to ±0.05mm depending on form and size | ASTM A29 |
| Heat Treatment Condition | Annealed, normalized, quenched and tempered | Customer specification |
| Testing Standards | ASTM A370, EN 10002, JIS Z2241 | International standards |
Let Us Create Success for Your Project
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Our Advantages in Processing AISI 8620
Advanced Vacuum Degassing Technology
MetalZenith employs cutting-edge vacuum degassing and ladle refining processes to minimize hydrogen content and non-metallic inclusions in AISI 8620, resulting in superior fatigue resistance and enhanced mechanical properties for critical applications.
Comprehensive Heat Treatment Services
Our in-house heat treatment facilities feature computer-controlled furnaces with precise atmosphere control, enabling optimized carburizing, quenching, and tempering cycles tailored to specific customer requirements and ensuring consistent case depth and core properties.
Global Supply Chain Excellence
MetalZenith's integrated supply chain and strategic inventory management ensure reliable delivery of AISI 8620 in various forms and sizes. Our global distribution network and flexible production scheduling accommodate both standard and custom specifications with competitive lead times.
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