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Technical Specifications
Product Overview
Metallurgical Characteristics
QT400 exhibits a ferritic-pearlitic matrix with spheroidal graphite nodules uniformly distributed throughout the microstructure. The controlled addition of magnesium during casting promotes graphite spheroidization, while subsequent quenching and tempering operations optimize the matrix structure for enhanced mechanical properties and structural performance.
Heat Treatment Process
MetalZenith employs controlled austenitizing at 850-900°C followed by oil or water quenching and tempering at 500-650°C. This precise heat treatment cycle ensures optimal balance between strength, ductility, and impact resistance while maintaining dimensional stability critical for structural applications.
Manufacturing Excellence
Our advanced casting process utilizes automated molding systems with precise temperature control and inoculation techniques. Real-time monitoring of cooling rates and chemical composition ensures consistent nodularity and mechanical properties across all production batches.
Specialized Quality Testing
QT400 undergoes comprehensive testing including welding performance evaluation using standard structural welding procedures, forming capability assessment through bend testing, fatigue strength determination under cyclic loading conditions, and atmospheric corrosion resistance testing in simulated environmental conditions.
Structural Engineering Applications
For building construction, QT400 provides excellent strength-to-weight ratio in load-bearing components. In bridge engineering, its superior fatigue resistance ensures long-term durability under dynamic loading. Machinery manufacturing benefits from its machinability and dimensional stability, while automotive applications leverage its impact resistance and vibration damping properties.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 3.60 - 3.80 |
| Silicon (Si) | 2.40 - 2.80 |
| Manganese (Mn) | 0.15 - 0.40 |
| Phosphorus (P) | ≤ 0.08 |
| Sulfur (S) | ≤ 0.02 |
| Magnesium (Mg) | 0.03 - 0.06 |
| Copper (Cu) | 0.20 - 0.80 |
| Nickel (Ni) | 0.10 - 0.50 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Yield Strength (MPa) | ≥ 250 |
| Tensile Strength (MPa) | ≥ 400 |
| Elongation (%) | ≥ 18 |
| Impact Energy at 20°C (J) | ≥ 12 |
| Hardness (HB) | 130 - 180 |
| Fatigue Strength (MPa) | 180 - 220 |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density (g/cm3) | 7.10 - 7.20 |
| Melting Point (°C) | 1150 - 1200 |
| Thermal Conductivity (W/m·K) | 36 - 42 |
| Thermal Expansion (×10??/K) | 10.5 - 12.0 |
| Elastic Modulus (GPa) | 169 - 175 |
| Poisson's Ratio | 0.27 - 0.30 |
📏 Product Specifications
| Specification | Details |
|---|---|
| Available Forms | Castings, Bars, Plates, Custom Shapes |
| Section Thickness | 10 - 200mm |
| Maximum Casting Size | Up to 5000mm |
| Weight Range | 1kg - 10,000kg |
| Standards Compliance | ASTM A536, ISO 1083, EN 1563 |
| Heat Treatment Condition | Quenched and Tempered |
| Surface Finish | As-cast, Machined, Shot-blasted |
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Our Advantages in Processing QT400 Steel
Advanced Quenching & Tempering Process
MetalZenith employs precision-controlled quenching and tempering processes with real-time temperature monitoring to achieve optimal microstructure and mechanical properties. Our advanced heat treatment ensures consistent spheroidal graphite distribution and enhanced ductility throughout the material cross-section.
Comprehensive Structural Testing
Our QT400 steel undergoes rigorous testing protocols including welding performance evaluation, forming capability assessment, fatigue strength testing, and atmospheric corrosion resistance analysis. These specialized tests ensure superior performance in demanding structural applications.
Custom Structural Solutions
MetalZenith provides tailored processing services including precision machining, custom heat treatment cycles, and application-specific quality testing. Our technical support team works closely with customers to optimize QT400 steel properties for specific structural engineering requirements.
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