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Technical Specifications
Product Overview
Metallurgical Characteristics
738H is a low-alloy steel with a tempered martensitic microstructure optimized for plastic mold applications. The steel contains aluminum for precipitation hardening, providing excellent through-hardness and dimensional stability. MetalZenith's controlled cooling and tempering processes ensure uniform carbide distribution and optimal grain structure.
Heat Treatment Process
MetalZenith employs a sophisticated heat treatment cycle including austenitizing at 845-870°C, followed by controlled cooling and double tempering at 500-550°C. This process achieves the target hardness of 36-40 HRC while maintaining excellent toughness and machinability. Our computer-controlled furnaces ensure precise temperature uniformity and repeatability.
Manufacturing Process
Production begins with vacuum induction melting (VIM) using high-purity raw materials, followed by electroslag remelting (ESR) for enhanced cleanliness. The ingots undergo controlled forging and rolling to achieve optimal grain flow and mechanical properties. MetalZenith's advanced processing capabilities include precision machining, EDM compatibility testing, and custom heat treatment services.
Quality Standards & Testing
Every batch undergoes comprehensive quality control including chemical analysis by optical emission spectroscopy, mechanical testing per ASTM standards, ultrasonic inspection for internal soundness, and dimensional verification. MetalZenith maintains full traceability documentation and provides certified test reports with each shipment, ensuring compliance with international mold steel specifications.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.38-0.45 |
| Silicon (Si) | 0.20-0.40 |
| Manganese (Mn) | 1.35-1.65 |
| Phosphorus (P) | ≤ 0.030 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 1.80-2.20 |
| Nickel (Ni) | 0.90-1.20 |
| Molybdenum (Mo) | 0.15-0.25 |
| Aluminum (Al) | 0.95-1.35 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 1180-1380 MPa |
| Yield Strength (0.2% offset) | ≥ 1030 MPa |
| Elongation | ≥ 10% |
| Reduction of Area | ≥ 35% |
| Hardness (Pre-hardened) | 36-40 HRC |
| Impact Energy (Charpy V-notch) | ≥ 20 J |
| Fatigue Limit (10&sup7; cycles) | 520 MPa |
| Young's Modulus | 210 GPa |
🔬 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 |
| Specific Heat Capacity | 460 J/kg·K |
| Electrical Resistivity | 0.28 µΩ·m |
| Magnetic Permeability | Ferromagnetic |
| Poisson's Ratio | 0.27-0.30 |
📏 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 |
| Length | Up to 6000 mm (custom lengths available) |
| Surface Finish | Black, machined, ground, polished |
| Dimensional Tolerance | h9-h11 (precision machining available) |
| Standards | ASTM A681, DIN 1.2738, JIS SKD61 |
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Our Advantages in Processing 738H
Advanced Vacuum Melting Technology
MetalZenith employs vacuum induction melting (VIM) and electroslag remelting (ESR) processes to produce 738H with exceptional cleanliness, minimal inclusions, and superior metallurgical homogeneity for consistent performance.
Precision Heat Treatment Control
Our computer-controlled heat treatment facilities ensure uniform hardness distribution and optimal microstructure throughout the material cross-section, delivering consistent mechanical properties and dimensional stability.
Comprehensive Customization Services
MetalZenith offers extensive customization options including precision machining, surface treatments, and dimensional tolerances tailored to specific mold requirements, supported by global logistics and technical expertise.
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