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Technical Specifications
Product Overview
Metallurgical Characteristics
Tamahagane marine steel features a refined tempered martensitic microstructure with fine carbide precipitation, achieved through MetalZenith's proprietary quench and tempering process. The controlled addition of chromium, nickel, and molybdenum enhances corrosion resistance and hardenability, while aluminum deoxidation ensures clean steel with minimal inclusions for superior fatigue performance in marine environments.
Heat Treatment Process
MetalZenith employs a specialized heat treatment cycle including austenitization at 920-950°C followed by controlled quenching and tempering at 580-620°C. This process, inspired by traditional Tamahagane techniques, optimizes the balance between strength, toughness, and corrosion resistance essential for marine applications.
Manufacturing Process Excellence
Our advanced manufacturing process incorporates electric arc furnace melting with secondary refining, continuous casting, and controlled rolling with accelerated cooling. Real-time monitoring of temperature, deformation, and cooling rates ensures consistent mechanical properties and microstructural uniformity throughout the material thickness.
Marine-Specific Quality Testing
Comprehensive testing protocols include Charpy V-notch impact testing at -40°C to ensure low-temperature toughness, ASTM G48 pitting corrosion testing in synthetic seawater, welding procedure qualification per AWS D1.1, and fatigue crack growth rate testing according to ASTM E647. Additional testing includes hydrogen-induced cracking (HIC) resistance and stress corrosion cracking (SCC) evaluation.
Marine Application Engineering
For offshore platforms, Tamahagane steel provides exceptional fatigue resistance under cyclic wave loading and superior corrosion resistance in splash zones. In ship construction, the steel's excellent weldability and impact toughness ensure structural integrity under dynamic loading. For subsea pipelines, the material's resistance to hydrogen embrittlement and stress corrosion cracking ensures long-term reliability. Port facilities benefit from the steel's durability against marine atmospheric corrosion and mechanical impact resistance.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.12 - 0.16 |
| Manganese (Mn) | 1.20 - 1.65 |
| Silicon (Si) | 0.15 - 0.55 |
| Phosphorus (P) | ≤ 0.020 |
| Sulfur (S) | ≤ 0.015 |
| Chromium (Cr) | 0.30 - 0.60 |
| Nickel (Ni) | 0.25 - 0.50 |
| Molybdenum (Mo) | 0.15 - 0.30 |
| Aluminum (Al) | ≥ 0.025 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Yield Strength (MPa) | ≥ 420 |
| Tensile Strength (MPa) | 540 - 720 |
| Elongation (%) | ≥ 22 |
| Impact Energy at -40°C (J) | ≥ 35 |
| Fatigue Strength (MPa) | 180 - 220 |
| Hardness (HB) | 160 - 220 |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density (g/cm3) | 7.87 |
| Melting Point (°C) | 1510 - 1540 |
| Thermal Conductivity (W/m·K) | 44.2 |
| Thermal Expansion (×10??/K) | 11.8 |
| Elastic Modulus (GPa) | 208 |
| Poisson's Ratio | 0.29 |
📏 Product Specifications
| Specification | Details |
|---|---|
| Available Forms | Plates, Sheets, Bars, Pipes, Forgings, Structural Sections |
| Thickness Range | 8 - 120mm |
| Width Range | 1200 - 4200mm |
| Length Range | 6000 - 20000mm |
| Standards Compliance | JIS G3106, ASTM A131, ABS, DNV-GL, Lloyd's Register |
| Heat Treatment Condition | Quenched and Tempered (Q&T) or TMCP |
| Surface Finish | Shot Blasted, Pickled, or Prime Coated |
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Our Advantages in Processing Tamahagane Marine Steel
Advanced Tamahagane-Inspired Processing
MetalZenith combines traditional Japanese Tamahagane metallurgical principles with modern controlled rolling and quench-tempering processes. Our proprietary multi-stage heat treatment with precise temperature control achieves superior grain structure and enhanced mechanical properties optimized for marine environments.
Comprehensive Marine Testing Protocol
Our Tamahagane marine steel undergoes extensive testing including -40°C Charpy V-notch impact testing, seawater immersion corrosion testing, welding procedure qualification, and Paris law fatigue crack growth analysis. This ensures exceptional performance in harsh offshore conditions with superior low-temperature toughness and corrosion resistance.
Custom Marine Engineering Solutions
MetalZenith provides comprehensive custom processing services including precision cutting, forming, welding preparation, and surface treatment specifically for marine applications. Our technical team offers specialized engineering support for offshore platform design, ship construction, and subsea pipeline projects.
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