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Technical Specifications
Product Overview
Metallurgical Characteristics
TRIP 800 steel exhibits a complex multiphase microstructure consisting of ferrite, bainite, and retained austenite phases. The retained austenite content typically ranges from 8-15%, providing the transformation-induced plasticity effect that enhances both strength and ductility. The TRIP mechanism occurs when retained austenite transforms to martensite under applied stress, resulting in exceptional work hardening behavior and energy absorption capacity.
Manufacturing Process
MetalZenith produces TRIP 800 steel through controlled hot rolling followed by precise continuous annealing. The critical intercritical annealing temperature range of 750-800°C ensures optimal austenite formation, while the subsequent isothermal bainitic transformation at 350-450°C stabilizes the retained austenite phase. Advanced cooling strategies and silicon additions suppress carbide precipitation, maintaining austenite stability at room temperature.
Heat Treatment Guidelines
TRIP 800 steel is supplied in the fully processed condition and does not require additional heat treatment. However, stress relief annealing at 150-200°C may be applied after forming operations. Welding should be performed using low heat input techniques to minimize microstructural changes in the heat-affected zone. Post-weld heat treatment is generally not recommended to preserve the beneficial TRIP microstructure.
Quality Standards & Testing
MetalZenith ensures TRIP 800 steel quality through comprehensive testing protocols including tensile testing per ASTM E8, hole expansion testing per ISO 16630, and retained austenite measurement using X-ray diffraction. Microstructural verification through optical and electron microscopy confirms proper phase distribution and morphology. All products are certified to international automotive standards including VDA 239-100 and ASTM A1011.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.15 - 0.25 |
| Manganese (Mn) | 1.40 - 2.00 |
| Silicon (Si) | 0.20 - 1.70 |
| Phosphorus (P) | ≤ 0.080 |
| Sulfur (S) | ≤ 0.015 |
| Aluminum (Al) | 0.015 - 0.070 |
| Chromium (Cr) | 0.30 - 0.80 |
| Molybdenum (Mo) | 0.10 - 0.30 |
| Nitrogen (N) | ≤ 0.009 |
| Titanium (Ti) | ≤ 0.015 |
| Niobium (Nb) | ≤ 0.09 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength (Rm) | 800 - 950 MPa |
| Yield Strength (Rp0.2) | 450 - 600 MPa |
| Elongation (A80) | ≥ 25% |
| Total Elongation (At) | ≥ 30% |
| Uniform Elongation (Ag) | ≥ 20% |
| Hardness (HV) | 250 - 300 |
| Young's Modulus (E) | 210 GPa |
| Poisson's Ratio (ν) | 0.30 |
| Impact Energy (Charpy V, 20°C) | ≥ 150 J |
| Fatigue Limit (107 cycles) | 320 - 380 MPa |
| Hole Expansion Ratio (λ) | ≥ 40% |
| Bending Angle (90°) | 1.0t - 1.5t |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Melting Point | 1510 - 1530°C |
| Thermal Conductivity (20°C) | 52 - 58 W/m·K |
| Thermal Expansion Coefficient (20-100°C) | 12.5×10-6/K |
| Specific Heat Capacity | 460 - 480 J/kg·K |
| Electrical Resistivity (20°C) | 0.18 - 0.22 µΩ·m |
| Magnetic Permeability | Ferromagnetic |
| Curie Temperature | 770°C |
| Thermal Diffusivity (20°C) | 14.5×10-6 m²/s |
| Emissivity (oxidized surface) | 0.85 - 0.95 |
📏 Product Specifications
| Specification | Details |
|---|---|
| Available Forms | Cold rolled sheet, Hot rolled sheet, Coil |
| Thickness Range | 0.6 - 3.0 mm |
| Width Range | 600 - 2100 mm |
| Length Range | 1000 - 6000 mm (sheets) |
| Coil Weight | 5 - 35 tons |
| Surface Finish | 2B, BA, No.4, Pickled & Oiled |
| Edge Condition | Mill edge, Slit edge, Trimmed edge |
| Thickness Tolerance | ±0.02 - ±0.05 mm |
| Width Tolerance | ±3.0 mm |
| Flatness | ≤ 2 I-units |
| Standards | EN 10338, JIS G3135, ASTM A1011 |
| Coating Options | Galvanized, Galvannealed, Organic coated |
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Our Advantages in Processing TRIP 800
Advanced Thermomechanical Processing
MetalZenith employs cutting-edge continuous annealing technology with precise temperature control and optimized cooling strategies to achieve the ideal microstructure balance of ferrite, bainite, and retained austenite, ensuring consistent TRIP effect activation and superior mechanical properties.
Comprehensive Quality Control Systems
Our integrated quality management system features real-time microstructural monitoring, advanced X-ray diffraction for retained austenite measurement, and comprehensive mechanical testing protocols to guarantee consistent formability and strength characteristics in every batch.
Customized Solutions & Technical Support
MetalZenith provides tailored TRIP 800 solutions with customizable chemical compositions, surface treatments, and dimensional specifications, backed by our expert metallurgical team offering comprehensive technical support for optimal application performance and processing optimization.
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