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Technical Specifications
Product Overview
Metallurgical Characteristics
33MnCrB5 is a low-alloy steel with boron microalloying designed for hot forming and press hardening applications. The boron addition significantly enhances hardenability, allowing for complete martensitic transformation during rapid cooling from forming temperatures. The steel exhibits excellent hot ductility and formability at temperatures between 900-950°C, making it ideal for complex automotive components.
Heat Treatment Process
The press hardening process involves heating the steel to austenitizing temperature (900-950°C), hot forming in heated dies, followed by rapid quenching at cooling rates exceeding 27°C/s. This thermomechanical treatment results in a fully martensitic microstructure with exceptional strength and hardness. The controlled heating and forming parameters are critical for achieving optimal mechanical properties.
Manufacturing Process
MetalZenith produces 33MnCrB5 through continuous casting followed by controlled hot rolling. The steel undergoes precise temperature control during rolling to optimize grain structure and ensure uniform mechanical properties. Post-rolling cooling is carefully managed to achieve the desired microstructure for subsequent press hardening operations. Quality control includes continuous monitoring of chemical composition and mechanical properties.
Quality Standards & Testing
All 33MnCrB5 products comply with international automotive standards including EN 10083-3 and customer-specific requirements. Testing protocols include chemical analysis by optical emission spectroscopy, tensile testing, hardness measurement, and microstructural examination. Hardenability testing confirms the steel's response to press hardening conditions. Full material certificates with test results and traceability documentation are provided with each shipment.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.30 - 0.37 |
| Manganese (Mn) | 1.15 - 1.45 |
| Silicon (Si) | 0.15 - 0.35 |
| Phosphorus (P) | ≤ 0.025 |
| Sulfur (S) | ≤ 0.015 |
| Chromium (Cr) | 0.28 - 0.35 |
| Boron (B) | 0.0008 - 0.005 |
| Aluminum (Al) | 0.020 - 0.060 |
| Titanium (Ti) | 0.020 - 0.050 |
| Nitrogen (N) | ≤ 0.010 |
⚙️ Mechanical Properties
| Property | As Delivered | After Press Hardening |
|---|---|---|
| Tensile Strength (Rm) | 600 - 750 MPa | ≥ 1500 MPa |
| Yield Strength (Rp0.2) | 350 - 500 MPa | ≥ 1200 MPa |
| Elongation (A80) | ≥ 12% | ≥ 4% |
| Hardness (HV10) | 180 - 220 | ≥ 470 |
| Impact Energy (KV at 20°C) | ≥ 40 J | ≥ 15 J |
| Fatigue Limit (10&sup7; cycles) | 280 MPa | 450 MPa |
| Young's Modulus | 210 GPa | 210 GPa |
| Poisson's Ratio | 0.30 | 0.30 |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Melting Point | 1480 - 1520°C |
| Thermal Conductivity (20°C) | 42 W/m·K |
| Thermal Expansion Coefficient (20-100°C) | 11.5×10-6/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 | 11.6 mm²/s |
📏 Product Specifications
| Specification | Available Options |
|---|---|
| Product Forms | Hot rolled coils, sheets, plates, blanks |
| Thickness Range | 0.8 - 6.0 mm |
| Width Range | 600 - 2100 mm |
| Coil Weight | Up to 35 tons |
| Surface Finish | Hot rolled, pickled, Al-Si coated |
| Edge Condition | Mill edge, slit edge, trimmed edge |
| Thickness Tolerance | ± 0.05 mm |
| Width Tolerance | ± 2.0 mm |
| Standards Compliance | EN 10083-3, JIS G4053, ASTM A29 |
| Coating Options | Uncoated, Al-Si (150 g/m²) |
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Our Advantages in Processing 33MnCrB5
Advanced Boron Microalloying Technology
MetalZenith employs proprietary boron addition techniques and controlled cooling processes to achieve optimal hardenability enhancement. Our precise metallurgical control ensures uniform boron distribution, maximizing the steel's response to heat treatment while maintaining excellent hot formability characteristics.
Comprehensive Quality Control Systems
Our integrated quality management system features real-time chemical composition monitoring, automated dimensional inspection, and advanced microstructural analysis. Every coil undergoes rigorous testing including hardenability verification, ensuring consistent performance in press hardening applications with full traceability documentation.
Customized Processing & Global Supply
MetalZenith offers tailored surface treatments, precision slitting, and custom packaging solutions to meet specific customer requirements. Our global distribution network ensures reliable supply chain management with just-in-time delivery capabilities and comprehensive technical support throughout the product lifecycle.
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