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Technical Specifications
Product Overview
Metallurgical Characteristics
NM550 wear resistant steel features a tempered martensitic microstructure achieved through controlled quenching and tempering processes. The steel's exceptional wear resistance results from its high hardness combined with optimized carbide distribution and fine grain structure. MetalZenith's advanced metallurgical control ensures uniform hardness throughout the plate thickness while maintaining excellent toughness properties.
Heat Treatment Process
The manufacturing process involves austenitizing at 900-950°C followed by rapid quenching to achieve martensitic transformation. Subsequent tempering at 200-250°C optimizes the balance between hardness and toughness. MetalZenith's computer-controlled heat treatment facilities ensure precise temperature uniformity (±5°C) and consistent cooling rates across the entire plate surface.
Manufacturing Process Control
MetalZenith employs continuous casting technology with electromagnetic stirring for homogeneous chemical composition. Hot rolling is performed using advanced mill technology with precise thickness control and optimized rolling schedules. Real-time process monitoring includes temperature tracking, dimensional measurement, and surface quality inspection throughout production.
Quality Standards & Testing
Comprehensive quality assurance includes chemical analysis by optical emission spectroscopy, hardness testing according to EN ISO 6506, Charpy V-notch impact testing per ASTM E23, and ultrasonic testing for internal soundness. Each plate undergoes dimensional verification using laser measurement systems and surface quality inspection according to EN 10163 standards. Complete mill test certificates with full traceability are provided for every shipment.
🧪 Chemical Composition
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.27 |
| Silicon (Si) | ≤ 0.70 |
| Manganese (Mn) | ≤ 1.60 |
| Phosphorus (P) | ≤ 0.025 |
| Sulfur (S) | ≤ 0.010 |
| Chromium (Cr) | 0.70 - 1.00 |
| Nickel (Ni) | ≤ 1.50 |
| Molybdenum (Mo) | ≤ 0.60 |
| Boron (B) | 0.0005 - 0.0060 |
| Titanium (Ti) | ≤ 0.15 |
| Aluminum (Al) | ≤ 0.10 |
| Vanadium (V) | ≤ 0.20 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Hardness (HBW) | 500 - 550 |
| Tensile Strength (Rm) | 1400 - 1700 MPa |
| Yield Strength (Rp0.2) | ≥ 1100 MPa |
| Elongation (A5) | ≥ 8% |
| Impact Energy (-40°C) | ≥ 30 J |
| Impact Energy (-20°C) | ≥ 35 J |
| Fatigue Limit (10^7 cycles) | 450 MPa |
| Fracture Toughness (KIC) | 45 MPa·m^0.5 |
| Young's Modulus | 210 GPa |
| Poisson's Ratio | 0.30 |
| Shear Modulus | 81 GPa |
🔬 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) | 0.20 µΩ·m |
| Magnetic Permeability | Ferromagnetic |
| Curie Temperature | 770°C |
| Thermal Diffusivity | 11.6 mm²/s |
📏 Product Specifications
| Specification | Details |
|---|---|
| Available Forms | Plates, Sheets, Cut-to-size pieces |
| Thickness Range | 4 - 80 mm |
| Width Range | 1000 - 3200 mm |
| Length Range | 2000 - 12000 mm |
| Thickness Tolerance | ±0.3 mm (t ≤ 20mm), ±0.5 mm (t > 20mm) |
| Width Tolerance | +0/-5 mm |
| Length Tolerance | +0/-10 mm |
| Surface Finish | Hot rolled, Shot blasted, Pickled |
| Edge Condition | Mill edge, Flame cut, Plasma cut, Machined |
| Standards | EN 10204-3.1, ASTM A514, JIS G3128 |
| Flatness | ≤ 5 mm/m |
| Surface Quality | Class A (EN 10163-2) |
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Our Advantages in Processing NM550
Advanced Heat Treatment Technology
MetalZenith employs state-of-the-art quenching and tempering facilities with precise temperature control (±5°C) and automated cooling systems, ensuring uniform hardness distribution and optimal microstructure throughout the steel plate thickness.
Comprehensive Quality Control System
Our integrated quality management includes real-time chemical composition monitoring, automated hardness testing every 500mm, ultrasonic thickness verification, and complete dimensional inspection using laser measurement technology for guaranteed specification compliance.
Flexible Customization & Global Supply
MetalZenith offers extensive customization options including plasma cutting, flame cutting, machining services, and special surface treatments. Our global logistics network ensures timely delivery worldwide with comprehensive technical support and engineering consultation services.
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