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Technical Specifications
Product Overview
Metallurgical Characteristics
718H is a low-alloy steel with a tempered martensitic microstructure in the pre-hardened condition. The steel features fine carbide distribution and optimized grain size for enhanced machinability and dimensional stability. The aluminum content provides precipitation hardening effects, contributing to the steel's excellent strength-to-toughness ratio.
Heat Treatment Process
MetalZenith's proprietary heat treatment process involves controlled austenitizing at 840-860°C, followed by oil quenching and double tempering at 540-580°C. This process ensures uniform hardness distribution and optimal microstructural refinement. The pre-hardened condition eliminates the need for customer heat treatment, reducing processing time and distortion risks.
Manufacturing Process Excellence
Our manufacturing process begins with vacuum induction melting using premium raw materials, followed by electroslag remelting (ESR) for enhanced cleanliness. The steel undergoes controlled forging and rolling operations to achieve optimal grain flow and mechanical properties. Advanced ultrasonic testing ensures internal soundness throughout the material.
Quality Standards & Certification
All 718H steel products are manufactured in accordance with ISO 9001:2015 quality management systems and comply with international standards including ASTM A681, DIN 1.2738, and JIS SKD61. Comprehensive material certificates include chemical analysis, mechanical properties, and dimensional verification data for complete traceability and quality assurance.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.37-0.43 |
| Silicon (Si) | 0.20-0.40 |
| Manganese (Mn) | 1.30-1.60 |
| Phosphorus (P) | ≤ 0.030 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 1.80-2.10 |
| Nickel (Ni) | 0.90-1.20 |
| Molybdenum (Mo) | 0.15-0.25 |
| Aluminum (Al) | 0.95-1.35 |
| Copper (Cu) | ≤ 0.30 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Hardness (Pre-hardened) | 33-37 HRC |
| Tensile Strength | 1080-1280 MPa |
| Yield Strength (0.2% offset) | ≥ 930 MPa |
| Elongation | ≥ 12% |
| Reduction of Area | ≥ 45% |
| Impact Energy (Charpy V-notch) | ≥ 25 J |
| Young's Modulus | 210 GPa |
| Fatigue Limit (10&sup7; cycles) | 480 MPa |
| Poisson's Ratio | 0.27-0.30 |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Melting Point | 1420-1460°C |
| Thermal Conductivity (20°C) | 42 W/m·K |
| Thermal Expansion Coefficient (20-100°C) | 11.5×10-6/K |
| Thermal Expansion Coefficient (20-200°C) | 12.2×10-6/K |
| Specific Heat Capacity | 460 J/kg·K |
| Electrical Resistivity (20°C) | 0.28 µΩ·m |
| Magnetic Permeability | Ferromagnetic |
| Thermal Diffusivity | 11.6 mm²/s |
📏 Product Specifications
| Specification | Available Options |
|---|---|
| Product Forms | Round bars, flat bars, plates, blocks, forged pieces |
| Round Bar Diameter | 10-500 mm |
| Flat Bar Thickness | 10-200 mm |
| Plate Thickness | 20-300 mm |
| Maximum Length | 6000 mm |
| Surface Finish | Hot rolled, peeled, ground, machined |
| Dimensional Tolerance | h9-h11 (standard), h7-h8 (precision) |
| Standards Compliance | ASTM A681, DIN 1.2738, JIS SKD61 |
| Delivery Condition | Pre-hardened 33-37 HRC |
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Our Advantages in Processing 718H
Advanced Vacuum Melting Technology
MetalZenith employs cutting-edge vacuum induction melting (VIM) and vacuum arc remelting (VAR) processes to produce 718H steel with exceptional cleanliness, uniform chemical composition, and minimized inclusions for superior mold performance.
Precision Heat Treatment Control
Our state-of-the-art heat treatment facilities feature computer-controlled furnaces with precise temperature monitoring and atmosphere control, ensuring consistent hardness distribution and optimal microstructure throughout the entire cross-section.
Comprehensive Customization Services
MetalZenith offers extensive customization capabilities including precision machining, surface treatments, and dimensional tolerances tailored to specific mold requirements, supported by our global supply chain and technical engineering team.
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