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Technical Specifications
Product Overview
Metallurgical Characteristics
JIS SCM420 is a low-alloy steel with a ferritic-pearlitic microstructure in the normalized condition. The chromium content provides enhanced hardenability and corrosion resistance, while molybdenum additions improve high-temperature strength and prevent temper brittleness. The balanced carbon content ensures optimal combination of strength and toughness.
Heat Treatment Processes
MetalZenith employs precise heat treatment protocols for JIS SCM420. Normalization is performed at 880-920°C followed by air cooling. For quenching and tempering applications, austenitizing occurs at 850-900°C, followed by oil quenching and tempering at 550-650°C to achieve desired mechanical properties. Stress relief annealing is conducted at 600-650°C when required.
Manufacturing Excellence
Our production process begins with electric arc furnace melting using premium scrap and alloy additions. Secondary refining through ladle metallurgy and vacuum degassing ensures chemical homogeneity and cleanliness. Continuous casting produces high-quality billets, which undergo controlled rolling or forging to achieve final dimensions. Advanced cooling strategies optimize microstructure development.
Quality Standards & Certifications
MetalZenith maintains strict adherence to JIS G4105 standards for SCM420 production. Our quality management system is ISO 9001:2015 certified, with additional certifications including AS9100 for aerospace applications and API Q1 for oil and gas industry requirements. Comprehensive testing includes chemical analysis by optical emission spectroscopy, mechanical property verification, ultrasonic testing for internal soundness, and dimensional inspection using coordinate measuring machines.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.18 - 0.23 |
| Silicon (Si) | 0.15 - 0.35 |
| Manganese (Mn) | 0.60 - 0.90 |
| Phosphorus (P) | ≤ 0.030 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 0.90 - 1.20 |
| Molybdenum (Mo) | 0.15 - 0.25 |
| Nickel (Ni) | ≤ 0.25 |
| Copper (Cu) | ≤ 0.30 |
| Aluminum (Al) | 0.020 - 0.050 |
⚙️ Mechanical Properties
| Property | Value | Condition |
|---|---|---|
| Tensile Strength | 655 - 850 MPa | Normalized |
| Yield Strength (0.2% offset) | ≥ 345 MPa | Normalized |
| Elongation | ≥ 20% | 50mm gauge length |
| Reduction of Area | ≥ 50% | Normalized |
| Hardness (HB) | 197 - 255 | Normalized |
| Impact Energy (Charpy V-notch) | ≥ 47 J | 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 | 1510°C | - |
| Thermal Conductivity | 42.7 W/m·K | 20°C |
| Thermal Expansion Coefficient | 12.2×10-6/K | 20-100°C |
| Specific Heat Capacity | 486 J/kg·K | 20°C |
| Electrical Resistivity | 0.22 µΩ·m | 20°C |
| Magnetic Permeability | Ferromagnetic | Room temperature |
| Poisson's Ratio | 0.27 - 0.30 | Room temperature |
📏 Product Specifications
| Specification | Available Options | Standards |
|---|---|---|
| Product Forms | Round bars, square bars, flat bars, plates, sheets, tubes, forgings | JIS G4105 |
| Round Bar Diameter | 6mm - 300mm | JIS G3123 |
| Plate Thickness | 3mm - 150mm | JIS G3123 |
| Sheet Thickness | 0.5mm - 6mm | JIS G3123 |
| Tube Outer Diameter | 10mm - 200mm | JIS G3445 |
| Length | Up to 12 meters (custom lengths available) | Customer specification |
| Surface Finish | Hot rolled, cold drawn, peeled, ground, machined | JIS B0601 |
| Dimensional Tolerance | h9 to h11 (precision grades available) | JIS B0401 |
| Heat Treatment Condition | Annealed, normalized, quenched & tempered | JIS G0201 |
Let Us Create Success for Your Project
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Our Advantages in Processing JIS SCM420
Advanced Vacuum Degassing Technology
MetalZenith employs cutting-edge vacuum degassing and ladle refining processes to achieve ultra-low sulfur and phosphorus content in JIS SCM420, resulting in superior cleanliness, enhanced fatigue resistance, and improved mechanical properties that exceed standard specifications.
Precision Heat Treatment Control
Our state-of-the-art computer-controlled heat treatment facilities ensure precise temperature uniformity and cooling rates for JIS SCM420, optimizing the chromium-molybdenum microstructure to achieve consistent hardness, strength, and toughness across all product dimensions.
Comprehensive Customization Capabilities
MetalZenith offers extensive customization options for JIS SCM420 including specialized heat treatment conditions, precision machining, custom dimensions, and application-specific property modifications, supported by our global supply chain and technical engineering services.
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