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Technical Specifications
Product Overview
Metallurgical Characteristics
GB Q890 is a low carbon, high strength structural steel with a fine-grained microstructure achieved through controlled thermomechanical processing. The steel features a tempered martensite or bainite microstructure that provides exceptional strength while maintaining good toughness and weldability. MetalZenith's proprietary alloying system incorporates precise amounts of Mn, Cr, Ni, Mo, and microalloying elements (V, Nb, Ti) to optimize hardenability and grain refinement.
Heat Treatment Process
MetalZenith employs a sophisticated quenching and tempering (Q+T) process for GB Q890 production. The steel is austenitized at 900-950°C, followed by controlled water quenching to achieve a fully martensitic structure. Subsequent tempering at 580-650°C optimizes the balance between strength and toughness. Our computer-controlled heat treatment ensures uniform properties throughout the material cross-section.
Manufacturing Excellence
Our advanced steel production facility utilizes electric arc furnace melting with ladle refining and vacuum degassing to achieve ultra-low inclusion content and precise chemical composition control. Continuous casting followed by controlled rolling in the austenite region ensures optimal grain structure development. MetalZenith's real-time process monitoring and automated quality control systems guarantee consistent mechanical properties batch to batch.
Quality Standards and Certifications
All GB Q890 products manufactured by MetalZenith comply with GB/T 1591 standards and are produced under ISO 9001:2015 quality management system. Comprehensive testing includes chemical analysis by optical emission spectroscopy, mechanical property verification through tensile and impact testing, and non-destructive evaluation using ultrasonic inspection. Material certificates include complete traceability documentation and third-party verification when required.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | ≤ 0.20 |
| Manganese (Mn) | 1.00 - 1.70 |
| Silicon (Si) | 0.15 - 0.60 |
| Phosphorus (P) | ≤ 0.025 |
| Sulfur (S) | ≤ 0.015 |
| Chromium (Cr) | 0.30 - 1.50 |
| Nickel (Ni) | 0.30 - 2.00 |
| Molybdenum (Mo) | 0.15 - 0.70 |
| Copper (Cu) | ≤ 0.50 |
| Aluminum (Al) | 0.015 - 0.060 |
| Vanadium (V) | 0.02 - 0.20 |
| Niobium (Nb) | 0.015 - 0.060 |
| Titanium (Ti) | 0.006 - 0.050 |
| Boron (B) | 0.0005 - 0.0050 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Yield Strength (Rp0.2) | ≥ 890 MPa |
| Tensile Strength (Rm) | 940 - 1180 MPa |
| Elongation (A5) | ≥ 14% |
| Impact Energy (KV2) at -40°C | ≥ 27 J |
| Impact Energy (KV2) at -60°C | ≥ 20 J |
| Brinell Hardness (HBW) | 280 - 360 |
| Young's Modulus | 210 GPa |
| Poisson's Ratio | 0.30 |
| Fatigue Limit (10^7 cycles) | 400 MPa |
| Fracture Toughness (KIC) | 120 MPa·m^0.5 |
| Reduction of Area | ≥ 50% |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Melting Point | 1450 - 1520°C |
| Thermal Conductivity (20°C) | 42 W/m·K |
| Thermal Expansion Coefficient (20-100°C) | 12.5×10-6/K |
| Thermal Expansion Coefficient (20-200°C) | 13.0×10-6/K |
| Specific Heat Capacity | 460 J/kg·K |
| Electrical Resistivity (20°C) | 0.18 µΩ·m |
| Magnetic Permeability | Ferromagnetic |
| Curie Temperature | 770°C |
| Thermal Diffusivity (20°C) | 11.6 mm²/s |
📏 Product Specifications
| Specification | Available Options |
|---|---|
| Product Forms | Plates, Sheets, Bars, Profiles, Custom Shapes |
| Plate Thickness | 8 - 130 mm |
| Sheet Thickness | 3 - 8 mm |
| Width Range | 1000 - 3200 mm |
| Length Range | 2000 - 18000 mm |
| Surface Finish | Hot Rolled, Normalized, Shot Blasted, Pickled |
| Edge Condition | Mill Edge, Sheared Edge, Flame Cut, Plasma Cut |
| Dimensional Tolerance | According to GB/T 709, EN 10029 |
| Flatness Tolerance | ≤ 5 mm/m |
| Standards Compliance | GB/T 1591, EN 10025-6, ASTM A514 |
| Delivery Condition | Quenched and Tempered (Q+T) |
| Testing Standards | GB/T 228, GB/T 229, GB/T 232 |
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Our Advantages in Processing GB Q890
Advanced Thermomechanical Processing
MetalZenith employs cutting-edge controlled rolling and accelerated cooling technologies to achieve precise microstructural control in GB Q890 steel. Our proprietary TMCP process ensures uniform mechanical properties, exceptional toughness, and superior weldability while maintaining the ultra-high strength characteristics required for demanding structural applications.
Comprehensive Quality Control System
Our integrated quality management system features real-time chemical composition monitoring, automated mechanical testing, and advanced non-destructive evaluation techniques. Every GB Q890 product undergoes rigorous inspection including ultrasonic testing, magnetic particle inspection, and dimensional verification to guarantee consistent quality and performance standards.
Custom Processing and Global Supply
MetalZenith offers extensive customization capabilities including precision cutting, forming, heat treatment, and surface finishing services for GB Q890 steel. Our global distribution network and strategic inventory management ensure reliable supply chain support with flexible delivery options tailored to project requirements worldwide.
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