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Technical Specifications
Product Overview
Metallurgical Structure & Properties
DP 800 exhibits a sophisticated dual phase microstructure consisting of approximately 70-80% soft ferrite matrix with 20-30% hard martensite islands. This unique microstructure is achieved through controlled thermomechanical processing and precise intercritical annealing at temperatures between 750-820°C, followed by rapid cooling to transform austenite to martensite while preserving the ferrite phase.
Manufacturing Process
MetalZenith employs advanced continuous annealing lines with precise temperature control and optimized cooling strategies. The steel undergoes hot rolling at temperatures above 1100°C, followed by controlled cooling and coiling. Cold rolling reduction of 50-70% refines the microstructure before the critical continuous annealing process that develops the dual phase structure. Skin pass rolling (0.5-1.5% reduction) ensures optimal surface finish and mechanical properties.
Heat Treatment & Processing
The intercritical annealing process is precisely controlled with heating rates of 10-15°C/s to the annealing temperature, followed by soaking for 60-120 seconds. Cooling rates of 20-50°C/s through the transformation range ensure optimal martensite formation. Post-annealing tempering at 150-200°C may be applied to optimize ductility and reduce residual stresses.
Quality Standards & Certifications
All DP 800 production meets stringent automotive quality standards including ISO/TS 16949, IATF 16949, and VDA 6.1. Comprehensive testing protocols include tensile testing per EN ISO 6892-1, formability assessment using Erichsen cupping tests, and metallographic verification of dual phase structure. Statistical process control ensures consistent mechanical properties with Cpk values ≥ 1.33 for all critical parameters.
🧪 Chemical Composition
| Element | Content (%) | Purpose |
|---|---|---|
| Carbon (C) | 0.06-0.12 | Strength enhancement |
| Manganese (Mn) | 1.40-2.20 | Hardenability, strength |
| Silicon (Si) | 0.15-0.70 | Deoxidation, strength |
| Phosphorus (P) | ≤ 0.025 | Controlled impurity |
| Sulfur (S) | ≤ 0.015 | Controlled impurity |
| Chromium (Cr) | 0.15-0.50 | Hardenability |
| Molybdenum (Mo) | 0.05-0.25 | Hardenability |
| Aluminum (Al) | 0.015-0.070 | Deoxidation, grain refinement |
| Nitrogen (N) | ≤ 0.009 | Controlled impurity |
| Titanium (Ti) | 0.010-0.050 | Microalloying element |
⚙️ Mechanical Properties
| Property | Value | Test Standard |
|---|---|---|
| Tensile Strength (Rm) | 780-950 MPa | EN ISO 6892-1 |
| Yield Strength (Rp0.2) | ≥ 500 MPa | EN ISO 6892-1 |
| Elongation (A80) | ≥ 14% | EN ISO 6892-1 |
| Uniform Elongation (Ag) | ≥ 7% | EN ISO 6892-1 |
| Hardness (HV10) | 240-290 | EN ISO 6507-1 |
| Young's Modulus | 210 GPa | EN ISO 6892-1 |
| Yield Ratio (Rp0.2/Rm) | 0.50-0.70 | Calculated |
| n-value (strain hardening) | ≥ 0.14 | EN ISO 10275 |
| r-value (plastic anisotropy) | ≥ 0.8 | EN ISO 10113 |
| Bending Angle (90°) | 1.0t minimum radius | VDA 238-100 |
🔬 Physical Properties
| Property | Value | Temperature |
|---|---|---|
| Density | 7.85 g/cm³ | 20°C |
| Melting Point | 1510°C | - |
| Thermal Conductivity | 54 W/m·K | 20°C |
| Specific Heat Capacity | 500 J/kg·K | 20°C |
| Thermal Expansion Coefficient | 12×10-6/K | 20-100°C |
| Electrical Resistivity | 0.16 µΩ·m | 20°C |
| Magnetic Permeability | Ferromagnetic | 20°C |
| Curie Temperature | 770°C | - |
| Poisson's Ratio | 0.27-0.30 | 20°C |
| Thermal Diffusivity | 13.8 mm²/s | 20°C |
📏 Product Specifications
| Specification | Range/Options | Standards |
|---|---|---|
| Product Forms | Cold rolled coils, sheets, blanks | EN 10346, ASTM A1011 |
| Thickness Range | 0.6-3.0 mm | EN 10131 |
| Width Range | 600-2100 mm | Customer specification |
| Coil Weight | 5-35 tons | Customer specification |
| Surface Finish | Mill finish, oiled | EN 10130 |
| Surface Quality | FB (commercial), FC (drawing) | EN 10130 |
| Thickness Tolerance | ±0.02-0.05 mm | EN 10131 |
| Width Tolerance | +0/-3 mm | EN 10131 |
| Flatness | ≤ 2 I-units | EN 10131 |
| Edge Condition | Mill edge, trimmed edge | Customer specification |
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Our Advantages in Processing DP 800
Advanced Dual Phase Microstructure Control
MetalZenith employs proprietary continuous annealing technology with precise temperature control (±5°C) and optimized cooling rates to achieve the ideal ferrite-martensite dual phase microstructure, ensuring consistent mechanical properties and superior formability in every coil.
Comprehensive Quality Testing & Certification
Our state-of-the-art testing laboratory performs complete mechanical property verification, metallographic analysis, and formability testing on every production batch. ISO/TS 16949 and IATF 16949 certifications guarantee automotive-grade quality standards with full traceability documentation.
Flexible Production & Custom Solutions
MetalZenith offers extensive customization capabilities including specific thickness ranges (0.6-3.0mm), width variations up to 2100mm, and tailored mechanical properties. Our flexible production scheduling and global logistics network ensure reliable supply chain management with technical support throughout the product lifecycle.
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