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Technical Specifications
Product Overview
Metallurgical Characteristics
TRIP 700 steel features a complex multi-phase microstructure consisting of ferrite, bainite, martensite, and 8-15% retained austenite. The transformation induced plasticity effect occurs when metastable retained austenite transforms to martensite under applied stress, providing exceptional work hardening and energy absorption capabilities.
Manufacturing Process
MetalZenith produces TRIP 700 through controlled hot rolling followed by precise continuous annealing. The critical intercritical annealing at 760-800°C and isothermal bainitic transformation at 400-450°C ensure optimal microstructural development. Advanced cooling strategies and chemical composition control maximize retained austenite stability.
Heat Treatment Parameters
The continuous annealing cycle includes heating to 800°C, controlled cooling to 450°C at 10-30°C/s, isothermal holding for 200-600 seconds, and final cooling to room temperature. This precise thermal cycle is critical for achieving the required mechanical properties and microstructural characteristics.
Quality Standards & Testing
MetalZenith's quality control includes X-ray fluorescence spectroscopy for chemical analysis, automated tensile testing per ASTM E8, microstructural examination using optical and electron microscopy, and retained austenite quantification via X-ray diffraction. Statistical process control ensures consistent product quality with Cpk values ≥ 1.33 for all critical parameters.
Forming and Processing Guidelines
TRIP 700 exhibits excellent formability with high uniform elongation and work hardening rate. Recommended forming speeds are 50-200 mm/s for optimal TRIP effect activation. The steel is suitable for complex stamping operations, deep drawing, and hydroforming applications with appropriate die design and lubrication systems.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.15 - 0.25 |
| Manganese (Mn) | 1.40 - 2.00 |
| Silicon (Si) | 0.20 - 0.60 |
| Phosphorus (P) | ≤ 0.080 |
| Sulfur (S) | ≤ 0.015 |
| Aluminum (Al) | 0.015 - 0.070 |
| Chromium (Cr) | 0.10 - 0.50 |
| Molybdenum (Mo) | 0.05 - 0.30 |
| Niobium (Nb) | 0.015 - 0.060 |
| Titanium (Ti) | 0.010 - 0.050 |
| Nitrogen (N) | ≤ 0.010 |
| Boron (B) | 0.0005 - 0.0050 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength (Rm) | 700 - 850 MPa |
| Yield Strength (Rp0.2) | 400 - 550 MPa |
| Elongation (A80) | ≥ 25% |
| Total Elongation (At) | ≥ 30% |
| Uniform Elongation (Ag) | ≥ 18% |
| Hardness (HV10) | 220 - 280 |
| r-value (Average) | 0.7 - 1.0 |
| n-value (Work Hardening) | 0.18 - 0.25 |
| Hole Expansion Ratio (λ) | ≥ 40% |
| Bending Radius (90°) | 1.0t - 1.5t |
| Impact Energy (Charpy V-notch at 20°C) | ≥ 80 J |
| Fatigue Limit (107 cycles) | 280 - 350 MPa |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Melting Point | 1480 - 1520°C |
| Young's Modulus | 210 GPa |
| Poisson's Ratio | 0.27 - 0.30 |
| Thermal Expansion Coefficient (20-100°C) | 12.5×10-6/K |
| Thermal Conductivity (at 20°C) | 50 - 55 W/m·K |
| Specific Heat Capacity | 460 J/kg·K |
| Electrical Resistivity (at 20°C) | 0.18 - 0.22 µΩ·m |
| Magnetic Permeability | Ferromagnetic |
| Curie Temperature | 760°C |
| Coercivity | 8 - 15 A/m |
| Saturation Magnetization | 1.6 - 1.8 T |
📏 Product Specifications
| Specification | Available Options |
|---|---|
| Product Forms | Hot Rolled Coil, Cold Rolled Coil, Cut-to-Length Sheets, Blanks |
| Thickness Range | 0.6 - 3.0 mm |
| Width Range | 600 - 1850 mm |
| Coil Weight | 5 - 25 tons |
| Sheet Length | 1000 - 6000 mm |
| Thickness Tolerance | ±0.02 - ±0.05 mm |
| Width Tolerance | ±2.0 mm |
| Flatness | ≤ 5 I-units |
| Surface Finish | Mill Finish, Oiled, Phosphated, Galvanized |
| Edge Condition | Mill Edge, Trimmed Edge, Slit Edge |
| Standards Compliance | ASTM A1011, EN 10338, JIS G3135, GB/T 5213 |
| Certifications | ISO 9001:2015, ISO/TS 16949, OHSAS 18001 |
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Our Advantages in Processing TRIP 700
Advanced TRIP Microstructure Control
MetalZenith's proprietary continuous annealing technology with precise temperature control (±5°C) ensures optimal retained austenite content (8-15%) for maximum transformation induced plasticity effect and superior energy absorption characteristics.
Comprehensive Quality Testing Systems
Our state-of-the-art laboratory features automated tensile testing, microstructural analysis, and real-time chemical composition monitoring. Every coil undergoes 100% inspection with statistical process control ensuring consistent mechanical properties and surface quality.
Flexible Supply Chain Solutions
MetalZenith offers customized thickness ranges (0.6-3.0mm), width specifications up to 1850mm, and just-in-time delivery through our global distribution network. Technical support includes forming simulation and application engineering services.
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