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Technical Specifications
Product Overview
Metallurgical Characteristics
UHSS features a complex multiphase microstructure consisting of martensite, bainite, and controlled amounts of retained austenite. The advanced microalloying with boron, molybdenum, and chromium enables exceptional hardenability and strength development. The quenching and partitioning process creates a unique microstructure that maximizes both strength and ductility through carbon redistribution and austenite stabilization.
Heat Treatment Process
MetalZenith employs a sophisticated Q&P heat treatment cycle involving rapid heating to 850-900°C, controlled cooling to the quenching temperature (200-300°C), followed by partitioning at 350-450°C. This precise thermal processing optimizes the martensite-austenite balance and carbon partitioning for maximum mechanical performance.
Manufacturing Process Excellence
Our state-of-the-art production line features continuous annealing with rapid heating and cooling capabilities, precise atmosphere control, and real-time microstructure monitoring. Advanced process control ensures consistent mechanical properties and surface quality throughout the coil length, critical for automotive stamping applications.
Specialized Quality Testing
MetalZenith conducts comprehensive testing including Erichsen cupping tests for formability assessment, hydrogen permeation analysis for embrittlement resistance, delayed fracture testing under sustained loading, and advanced weldability evaluation including heat-affected zone characterization. Specialized bend testing and hole expansion testing ensure optimal performance in forming operations.
Application Engineering Considerations
For automotive applications, UHSS enables significant weight reduction while maintaining crash performance through optimized energy absorption. In construction and bridge engineering, the high strength-to-weight ratio allows for longer spans and reduced material usage. For pressure vessels and lifting equipment, the exceptional fatigue resistance and fracture toughness ensure long-term reliability under cyclic loading conditions. Specialized forming guidelines and welding procedures are provided for each application sector.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.15 - 0.25 |
| Manganese (Mn) | 1.50 - 2.50 |
| Silicon (Si) | 0.20 - 1.50 |
| Chromium (Cr) | 0.30 - 1.20 |
| Molybdenum (Mo) | 0.15 - 0.50 |
| Boron (B) | 0.0015 - 0.0050 |
| Aluminum (Al) | 0.020 - 0.060 |
| Phosphorus (P) | ≤ 0.015 |
| Sulfur (S) | ≤ 0.010 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Yield Strength (MPa) | ≥ 1180 |
| Tensile Strength (MPa) | 1470 - 1620 |
| Elongation (%) | ≥ 6 |
| Impact Energy at 20°C (J) | ≥ 25 |
| Fatigue Strength (MPa) | ≥ 500 |
| Hardness (HV) | 450 - 520 |
| Hole Expansion Ratio (%) | ≥ 15 |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density (g/cm3) | 7.85 |
| Melting Point (°C) | 1480 - 1520 |
| Thermal Conductivity (W/m·K) | 42.5 |
| Thermal Expansion (×10??/K) | 11.8 |
| Elastic Modulus (GPa) | 210 |
| Poisson's Ratio | 0.27 - 0.30 |
📏 Product Specifications
| Specification | Details |
|---|---|
| Available Forms | Sheets, Plates, Coils, Blanks, Formed Parts |
| Thickness Range | 0.8 - 8.0mm |
| Width Range | 600 - 2100mm |
| Length Range | 1000 - 6000mm |
| Standards Compliance | ASTM A1011, JIS G3135, EN 10149 |
| Surface Condition | Hot Rolled, Cold Rolled, Galvanized |
| Heat Treatment | Quenched & Partitioned (Q&P) |
| Edge Condition | Mill Edge, Slit Edge, Trimmed |
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Our Advantages in Processing UHSS Ultra High Strength Steel
Advanced Quenching & Partitioning Technology
MetalZenith utilizes state-of-the-art quenching and partitioning (Q&P) processes with precise temperature control and optimized cooling rates to achieve complex microstructures. Our advanced TMCP technology ensures exceptional strength-ductility balance through controlled austenite transformation and carbon partitioning.
Comprehensive High-Strength Testing Protocol
Our specialized testing regime includes advanced formability analysis using Erichsen and limiting dome height tests, hydrogen-induced cracking resistance evaluation, delayed fracture susceptibility assessment, and comprehensive weldability studies including heat-affected zone characterization for ultra-high strength applications.
Precision Engineering & Custom Solutions
MetalZenith provides tailored UHSS solutions with custom strength grades, specialized forming recommendations, and comprehensive technical support. Our engineering team offers application-specific heat treatment optimization and joining technology guidance for critical high-strength applications.
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