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Technical Specifications
Product Overview
Metallurgical Characteristics
JIS SM490 is a low-alloy, high-strength structural steel with a predominantly ferritic-pearlitic microstructure. The controlled carbon content (≤ 0.18%) ensures excellent weldability while maintaining adequate strength levels. The addition of manganese enhances hardenability and strength, while silicon acts as a deoxidizer and contributes to solid solution strengthening.
Manufacturing Process
MetalZenith produces JIS SM490 through advanced steelmaking processes including electric arc furnace melting, ladle refining, and continuous casting. The steel undergoes controlled rolling at temperatures between 900-1100°C, followed by accelerated cooling to achieve optimal grain refinement and mechanical properties. Thermomechanical controlled processing (TMCP) ensures consistent microstructure and enhanced toughness.
Heat Treatment Options
While JIS SM490 is typically supplied in the as-rolled condition, various heat treatment options are available including normalizing (900-950°C), stress relieving (580-650°C), and controlled cooling treatments. These processes can be tailored to specific application requirements for enhanced mechanical properties or stress relief.
Welding Characteristics
The low carbon equivalent (Ceq ≤ 0.44%) of JIS SM490 provides excellent weldability with minimal preheating requirements. The steel is compatible with various welding processes including SMAW, GMAW, FCAW, and SAW. Proper welding procedures ensure full strength joints without significant heat-affected zone degradation.
Quality Standards & Testing
MetalZenith's JIS SM490 production adheres to strict quality standards including JIS G 3106 specifications. Comprehensive testing includes chemical analysis by optical emission spectroscopy, mechanical testing per JIS Z 2241, Charpy impact testing at specified temperatures, and ultrasonic inspection for internal soundness. Mill test certificates (3.1 per EN 10204) are provided with each shipment.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | ≤ 0.18 |
| Manganese (Mn) | ≤ 1.60 |
| Silicon (Si) | ≤ 0.55 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.035 |
| Chromium (Cr) | ≤ 0.30 |
| Nickel (Ni) | ≤ 0.30 |
| Copper (Cu) | ≤ 0.30 |
| Vanadium (V) | ≤ 0.10 |
| Niobium (Nb) | ≤ 0.05 |
| Titanium (Ti) | ≤ 0.05 |
| Aluminum (Al) | ≥ 0.015 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Yield Strength (min) | 325 MPa |
| Tensile Strength | 490-610 MPa |
| Elongation (min) | 17% |
| Brinell Hardness | 147-207 HB |
| Charpy V-Notch Impact Energy (0°C) | ≥ 27 J |
| Young's Modulus | 200-210 GPa |
| Shear Modulus | 80 GPa |
| Poisson's Ratio | 0.27-0.30 |
| Fatigue Limit (10^7 cycles) | 245 MPa |
| Reduction of Area (min) | 50% |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Melting Point | 1510-1540°C |
| Thermal Conductivity (20°C) | 54 W/m·K |
| Thermal Expansion Coefficient (20-100°C) | 12×10-6/K |
| Specific Heat Capacity | 500 J/kg·K |
| Electrical Resistivity (20°C) | 0.16 µΩ·m |
| Magnetic Permeability | Ferromagnetic |
| Curie Temperature | 770°C |
| Thermal Diffusivity | 13.8 mm²/s |
| Emissivity (oxidized surface) | 0.79 |
📏 Product Specifications
| Specification | Details |
|---|---|
| Available Forms | Plates, Sheets, Bars, Beams, Channels, Angles |
| Plate Thickness Range | 6-200 mm |
| Sheet Thickness Range | 1.5-6 mm |
| Width Range | 1000-4000 mm |
| Length Range | 2000-18000 mm |
| Standards Compliance | JIS G 3106, JIS G 3136 |
| Surface Finish | Hot Rolled, Normalized, Shot Blasted |
| Dimensional Tolerance | ±0.5mm (thickness), ±5mm (width/length) |
| Edge Condition | Mill Edge, Slit Edge, Flame Cut |
| Delivery Condition | As Rolled, Normalized, Stress Relieved |
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Our Advantages in Processing JIS SM490
Advanced Thermomechanical Processing
MetalZenith utilizes cutting-edge controlled rolling and accelerated cooling technologies to achieve optimal grain refinement and enhanced mechanical properties in JIS SM490 steel, ensuring superior strength and toughness characteristics.
Comprehensive Quality Control System
Our integrated quality management system includes real-time chemical analysis, automated mechanical testing, ultrasonic inspection, and statistical process control to guarantee consistent material properties and dimensional accuracy.
Flexible Customization & Global Supply
MetalZenith offers extensive customization options including specific dimensions, surface treatments, and packaging solutions, supported by our global distribution network and just-in-time delivery capabilities.
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