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Technical Specifications
Product Overview
Metallurgical Characteristics
738 steel features a tempered martensitic microstructure that provides an optimal balance of strength, toughness, and machinability. The controlled addition of aluminum creates fine precipitates that enhance strength while maintaining excellent dimensional stability during machining operations. The low sulfur content ensures superior surface finish quality and reduces the risk of inclusion-related defects.
Heat Treatment Process
MetalZenith's proprietary heat treatment process involves austenitizing at 850-870°C followed by controlled cooling and tempering at 550-600°C. This process ensures uniform hardness distribution and optimal microstructure development. The pre-hardened condition eliminates the need for post-machining heat treatment, reducing manufacturing time and preventing dimensional distortion.
Manufacturing Process Excellence
Our manufacturing process begins with vacuum induction melting to ensure chemical homogeneity and cleanliness. The steel undergoes electroslag remelting for further purification, followed by controlled forging and rolling operations. Each production lot is subjected to comprehensive testing including ultrasonic inspection, chemical analysis, and mechanical property verification to ensure consistent quality.
Quality Standards and Certifications
MetalZenith's 738 steel production facilities are certified to ISO 9001:2015, ISO 14001:2015, and OHSAS 18001 standards. Our quality management system ensures full traceability from raw materials to finished products, with comprehensive documentation including material certificates, test reports, and dimensional inspection records for every shipment.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.35-0.42 |
| Silicon (Si) | 0.20-0.40 |
| Manganese (Mn) | 1.35-1.65 |
| Phosphorus (P) | ≤ 0.025 |
| Sulfur (S) | ≤ 0.010 |
| Chromium (Cr) | 0.90-1.20 |
| Nickel (Ni) | 1.65-2.00 |
| Molybdenum (Mo) | 0.15-0.25 |
| Aluminum (Al) | 0.95-1.35 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 1030-1180 MPa |
| Yield Strength (0.2% offset) | ≥ 930 MPa |
| Elongation | ≥ 12% |
| Reduction of Area | ≥ 45% |
| Hardness (Pre-hardened) | 30-37 HRC |
| Impact Energy (Charpy V-notch) | ≥ 25 J |
| Fatigue Limit (10&sup7; cycles) | 450 MPa |
| Young's Modulus | 210 GPa |
| Poisson's Ratio | 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 |
| Specific Heat Capacity | 460 J/kg·K |
| Electrical Resistivity (20°C) | 0.25 µΩ·m |
| Magnetic Permeability | Ferromagnetic |
| Curie Temperature | 750°C |
📏 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 |
| Surface Finish | Black, machined, ground, polished |
| Dimensional Tolerance | h9 to h11 (standard), h6 to h8 (precision) |
| Standards Compliance | ASTM A681, EN ISO 4957, JIS SKD61 |
| Condition | Pre-hardened, annealed, normalized |
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Our Advantages in Processing 738
Advanced Vacuum Melting Technology
MetalZenith employs cutting-edge vacuum induction melting and electroslag remelting processes to produce 738 steel with exceptional cleanliness and homogeneity. Our controlled atmosphere melting eliminates inclusions and ensures consistent chemical composition throughout the material, resulting in superior machinability and surface finish quality.
Precision Heat Treatment Control
Our state-of-the-art heat treatment facilities feature computer-controlled furnaces with precise temperature monitoring and atmosphere control. This ensures optimal microstructure development and consistent hardness levels across all 738 steel products, eliminating dimensional distortion and guaranteeing predictable machining characteristics.
Comprehensive Customization Capabilities
MetalZenith offers extensive customization options for 738 steel including specific dimensional tolerances, surface finishes, and packaging requirements. Our global supply chain network ensures rapid delivery worldwide, while our technical support team provides expert guidance for optimal material selection and application engineering.
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