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Technical Specifications
Product Overview
Metallurgical Characteristics
JIS SCr440 is a medium-carbon chromium alloy steel with excellent hardenability and mechanical properties. The chromium content provides enhanced hardenability, allowing for through-hardening in larger sections compared to plain carbon steels. The steel exhibits a predominantly pearlitic microstructure in the normalized condition, transforming to martensite upon quenching with subsequent tempering to achieve desired mechanical properties.
Heat Treatment Processes
MetalZenith employs controlled atmosphere furnaces for optimal heat treatment of JIS SCr440. Normalization is performed at 850-900°C followed by air cooling. For hardening applications, austenitizing at 820-860°C followed by oil quenching and tempering at 150-650°C depending on required hardness levels. Our heat treatment facilities ensure uniform heating, precise temperature control, and consistent cooling rates for optimal microstructural development.
Manufacturing Process Excellence
Our integrated steel production process begins with electric arc furnace melting using high-quality scrap and alloy additions. Secondary refining through ladle metallurgy and vacuum degassing ensures precise chemistry control and low inclusion content. Continuous casting produces high-quality billets, which undergo controlled rolling in our modern hot strip mills and bar mills. Advanced process control systems monitor temperature, reduction ratios, and cooling rates throughout production.
Quality Standards and Testing
MetalZenith maintains comprehensive quality assurance programs complying with JIS G4105 standards and international equivalents including ASTM A29 and EN 10083. Our testing protocols include chemical analysis by optical emission spectrometry, mechanical property verification through tensile and impact testing, hardness measurements, and metallographic examination. Non-destructive testing including ultrasonic and magnetic particle inspection ensures internal soundness and surface quality integrity.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.38 - 0.43 |
| Silicon (Si) | 0.15 - 0.35 |
| Manganese (Mn) | 0.60 - 0.85 |
| Phosphorus (P) | ≤ 0.030 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 0.90 - 1.20 |
| Nickel (Ni) | ≤ 0.25 |
| Copper (Cu) | ≤ 0.30 |
| Iron (Fe) | Balance |
⚙️ Mechanical Properties
| Property | Value | Condition |
|---|---|---|
| Tensile Strength | 686 MPa (min) | Normalized |
| Yield Strength | 392 MPa (min) | Normalized |
| Elongation | 17% (min) | Normalized |
| Reduction of Area | 45% (min) | Normalized |
| Brinell Hardness | 207 HB (max) | Normalized |
| Impact Energy (Charpy V) | 49 J (min) | At 20°C |
| Fatigue Limit | 320 MPa | 10&sup7; cycles |
| Young's Modulus | 210 GPa | Room Temperature |
🔬 Physical Properties
| Property | Value | Temperature |
|---|---|---|
| Density | 7.85 g/cm³ | 20°C |
| Melting Point | 1450-1520°C | - |
| Thermal Conductivity | 42 W/m·K | 20°C |
| Thermal Expansion Coefficient | 12.5×10-6/K | 20-100°C |
| Specific Heat Capacity | 460 J/kg·K | 20°C |
| Electrical Resistivity | 0.22 µΩ·m | 20°C |
| Magnetic Permeability | Ferromagnetic | 20°C |
| Curie Temperature | 770°C | - |
📏 Product Specifications
| Specification | Available Options | Standards |
|---|---|---|
| Product Forms | Round bars, square bars, flat bars, plates, sheets, forgings | JIS G4105 |
| Round Bar Diameter | 6mm - 300mm | JIS G3311 |
| Plate Thickness | 3mm - 100mm | JIS G3193 |
| Sheet Thickness | 0.5mm - 6mm | JIS G3141 |
| Length | Up to 12 meters (custom lengths available) | Customer specification |
| Surface Finish | Hot rolled, cold drawn, peeled, ground, polished | JIS G0601 |
| Dimensional Tolerance | h9, h10, h11 (bars), ±0.1mm (plates) | JIS B0401 |
| Heat Treatment | Normalized, annealed, quenched and tempered | Customer requirement |
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Our Advantages in Processing JIS SCr440
Advanced Electric Arc Furnace Technology
MetalZenith utilizes cutting-edge electric arc furnace technology combined with ladle refining and vacuum degassing processes to achieve precise chemical composition control and exceptional steel cleanliness, ensuring superior mechanical properties and consistent quality in every batch of JIS SCr440 steel.
Comprehensive Quality Control Systems
Our state-of-the-art testing laboratories feature advanced spectrometers, universal testing machines, and metallographic equipment providing complete chemical analysis, mechanical property verification, and microstructural examination, guaranteeing JIS SCr440 steel meets the most stringent quality requirements.
Global Supply Chain and Customization
MetalZenith's extensive global distribution network and flexible manufacturing capabilities enable rapid delivery of JIS SCr440 steel in various forms and sizes, with custom heat treatment, machining, and surface finishing services tailored to specific application requirements worldwide.
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