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Technical Specifications
Product Overview
Metallurgical Characteristics
DH36 marine steel features a fine-grained ferritic-pearlitic microstructure achieved through controlled rolling and accelerated cooling processes. The addition of microalloying elements such as niobium, vanadium, and titanium provides grain refinement and precipitation strengthening, resulting in enhanced mechanical properties and improved low-temperature toughness.
Heat Treatment Process
MetalZenith employs a normalized heat treatment process for DH36 steel, involving heating to 920-950°C followed by air cooling. This treatment ensures uniform microstructure, stress relief, and optimal mechanical properties. Our advanced heat treatment facilities maintain precise temperature control with ±5°C accuracy throughout the process.
Manufacturing Process
Our DH36 steel production utilizes electric arc furnace melting followed by ladle refining and vacuum degassing to achieve superior cleanliness and chemical homogeneity. The steel undergoes controlled rolling with specific reduction ratios and finishing temperatures to optimize grain structure and mechanical properties.
Quality Standards & Testing
Every batch of DH36 steel undergoes comprehensive testing including chemical analysis by optical emission spectroscopy, mechanical property verification through tensile and impact testing, ultrasonic testing for internal soundness, and dimensional inspection. MetalZenith maintains full traceability from raw materials to finished products, ensuring compliance with marine classification society requirements and international standards.
Weldability & Fabrication
DH36 steel exhibits excellent weldability with most conventional welding processes including SMAW, GMAW, FCAW, and SAW. The carbon equivalent (CEV) is controlled to ≤0.40% to ensure good weldability without preheating for most applications. Post-weld heat treatment may be required for thick sections or critical applications.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | ≤ 0.18 |
| Manganese (Mn) | 0.90 - 1.60 |
| Silicon (Si) | 0.10 - 0.50 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.035 |
| Aluminum (Al) | ≥ 0.015 |
| Niobium (Nb) | 0.02 - 0.05 |
| Vanadium (V) | 0.05 - 0.10 |
| Titanium (Ti) | 0.02 - 0.05 |
| Copper (Cu) | ≤ 0.35 |
| Chromium (Cr) | ≤ 0.20 |
| Nickel (Ni) | ≤ 0.40 |
| Molybdenum (Mo) | ≤ 0.08 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Yield Strength (ReH) | ≥ 355 MPa |
| Tensile Strength (Rm) | 490 - 630 MPa |
| Elongation (A5) | ≥ 22% |
| Impact Energy (KV at 0°C) | ≥ 34 J |
| Impact Energy (KV at -20°C) | ≥ 24 J |
| Brinell Hardness (HB) | 150 - 220 |
| Young's Modulus | 210 GPa |
| Poisson's Ratio | 0.30 |
| Fatigue Limit (107 cycles) | 245 MPa |
| Fracture Toughness (KIC) | 150 MPa·m1/2 |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Melting Point | 1510°C |
| Thermal Conductivity (20°C) | 54 W/m·K |
| Thermal Expansion Coefficient (20-100°C) | 12×10-6/K |
| Specific Heat Capacity | 500 J/kg·K |
| Electrical Resistivity (20°C) | 0.16 µΩ·m |
| Magnetic Permeability | Ferromagnetic |
| Curie Temperature | 770°C |
| Thermal Diffusivity | 13.7 mm²/s |
| Emissivity (oxidized surface) | 0.79 |
📏 Product Specifications
| Specification | Details |
|---|---|
| Available Forms | Plates, Sheets, Bars, Sections, Forgings |
| Plate Thickness Range | 6mm - 150mm |
| Sheet Thickness Range | 1.5mm - 6mm |
| Width Range | 1000mm - 4000mm |
| Length Range | 2000mm - 18000mm |
| Standards Compliance | ASTM A131, ABS, DNV-GL, Lloyd's Register, BV |
| Surface Finish | Hot Rolled, Normalized, Shot Blasted, Pickled |
| Edge Condition | Mill Edge, Sheared Edge, Flame Cut, Machined |
| Thickness Tolerance | ±0.3mm (t≤20mm), ±0.05t (t>20mm) |
| Width Tolerance | ±5mm |
| Length Tolerance | ±10mm |
| Flatness Tolerance | ≤5mm/m |
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Our Advantages in Processing DH36
Advanced Thermomechanical Processing
MetalZenith employs cutting-edge controlled rolling and accelerated cooling technology to achieve optimal grain structure in DH36 steel, resulting in superior mechanical properties and enhanced toughness for marine applications.
Comprehensive Quality Control System
Our integrated quality management system includes real-time chemical composition monitoring, automated mechanical testing, and advanced non-destructive testing methods to ensure every batch of DH36 steel meets stringent marine industry standards.
Flexible Customization & Global Supply
MetalZenith offers extensive customization options for DH36 steel including specific dimensions, surface treatments, and certification requirements, backed by our global distribution network ensuring timely delivery worldwide.
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