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Technical Specifications
Product Overview
Metallurgical Characteristics
S7 is a chromium-tungsten-molybdenum shock-resistant tool steel designed for applications requiring exceptional toughness and impact resistance. The alloy's unique composition creates a fine-grained martensitic structure with well-distributed carbides that provide excellent shock absorption properties while maintaining good wear resistance.
Heat Treatment Process
MetalZenith's optimized heat treatment involves preheating to 650-700°C, followed by austenitizing at 940-980°C in protective atmosphere. Quenching is performed in oil or air depending on section size, followed by tempering at 150-650°C to achieve desired hardness levels. Our controlled cooling rates ensure minimal distortion and optimal microstructure.
Manufacturing Process
Production begins with electric arc furnace melting using premium raw materials, followed by ladle refining and vacuum degassing. The steel undergoes electroslag remelting (ESR) for enhanced cleanliness and homogeneity. Hot forging and controlled cooling optimize grain structure, while precision machining and surface treatments meet exact customer specifications.
Quality Standards
All S7 steel products comply with international standards including ASTM A681, DIN 1.2355, and JIS SKS3. Comprehensive testing includes chemical analysis by optical emission spectroscopy, mechanical property verification, ultrasonic inspection for internal soundness, and dimensional verification. Our ISO 9001:2015 quality management system ensures consistent product excellence and full traceability from raw materials to finished products.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.45 - 0.55 |
| Manganese (Mn) | 0.20 - 0.80 |
| Silicon (Si) | 0.20 - 1.00 |
| Phosphorus (P) | ≤ 0.030 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 3.00 - 3.50 |
| Molybdenum (Mo) | 1.30 - 1.80 |
| Tungsten (W) | 1.30 - 1.80 |
| Nickel (Ni) | ≤ 0.30 |
| Copper (Cu) | ≤ 0.25 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength (Annealed) | 690 - 790 MPa |
| Yield Strength (Annealed) | 415 - 485 MPa |
| Elongation (Annealed) | 22 - 28% |
| Reduction of Area (Annealed) | 45 - 55% |
| Hardness (Annealed) | 197 - 229 HB |
| Hardness (Hardened & Tempered) | 54 - 58 HRC |
| Impact Energy (Charpy V-notch) | 40 - 60 J |
| Fatigue Limit | 550 - 650 MPa |
| Modulus of Elasticity | 210 GPa |
| Poisson's Ratio | 0.27 - 0.30 |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density | 7.80 g/cm³ |
| Melting Point | 1480 - 1520°C |
| Thermal Conductivity (20°C) | 28 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) | 0.65 µΩ·m |
| Magnetic Permeability | Ferromagnetic |
| Curie Temperature | 760°C |
| Thermal Diffusivity | 7.8×10-6 m²/s |
📏 Product Specifications
| Specification | Details |
|---|---|
| Available Forms | Round bars, flat bars, plates, blocks, forgings |
| Round Bar Diameter | 6 - 500 mm |
| Flat Bar Thickness | 10 - 200 mm |
| Plate Thickness | 20 - 300 mm |
| Standard Length | 3000 - 6000 mm (custom lengths available) |
| Surface Finish | Hot rolled, annealed, machined, ground |
| Dimensional Tolerance | ±0.1 mm (precision machined) |
| Standards Compliance | ASTM A681, DIN 1.2355, JIS SKS3 |
| Heat Treatment Condition | Annealed, hardened & tempered (optional) |
| Quality Certification | Mill test certificate, chemical analysis, mechanical properties |
Let Us Create Success for Your Project
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Our Advantages in Processing S7
Advanced Vacuum Melting Technology
MetalZenith employs state-of-the-art vacuum induction melting (VIM) and electroslag remelting (ESR) processes to produce S7 steel with exceptional cleanliness and chemical homogeneity. Our controlled atmosphere processing eliminates harmful inclusions and ensures consistent grain structure for optimal shock resistance and reliability.
Precision Heat Treatment Control
Our proprietary heat treatment protocols utilize computer-controlled furnaces with precise temperature monitoring and atmosphere control. This ensures optimal carbide distribution and matrix hardness balance, delivering consistent mechanical properties and maximizing the shock resistance characteristics of S7 steel.
Comprehensive Customization Services
MetalZenith offers extensive customization capabilities including precision machining, specialized heat treatment cycles, and custom dimensions. Our global supply chain network ensures rapid delivery worldwide, while our technical support team provides expert consultation for application-specific requirements and performance optimization.
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