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Technical Specifications
Product Overview
Metallurgical Characteristics
JIS SNCM439 is a low-alloy steel featuring a nickel-chromium-molybdenum composition that provides exceptional hardenability and strength retention. The controlled addition of nickel enhances toughness and impact resistance, while chromium contributes to hardenability and wear resistance. Molybdenum prevents temper brittleness and maintains strength at elevated temperatures.
Heat Treatment Process
MetalZenith's heat treatment process involves austenitizing at 840-860°C followed by oil quenching to achieve martensitic structure. Tempering is performed at 540-650°C depending on desired hardness levels. Our controlled atmosphere furnaces ensure uniform heating and prevent decarburization, while precise temperature monitoring guarantees consistent mechanical properties throughout the cross-section.
Manufacturing Process Excellence
Production begins with electric arc furnace melting using premium scrap and alloy additions. Secondary refining through ladle metallurgy and vacuum degassing removes impurities and controls inclusion morphology. Continuous casting produces high-quality billets, which undergo controlled rolling to achieve optimal grain structure and mechanical properties. Advanced ultrasonic testing ensures internal soundness.
Quality Standards & Certifications
MetalZenith maintains compliance with JIS G4103 standards and equivalent international specifications including ASTM A322, EN 10083-3, and DIN 17200. Our quality management system encompasses chemical analysis via optical emission spectroscopy, mechanical testing per JIS Z2241, microstructural examination, and non-destructive testing. Mill test certificates provide complete traceability and property verification for each batch delivered.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.37 - 0.43 |
| Silicon (Si) | 0.15 - 0.35 |
| Manganese (Mn) | 0.60 - 0.85 |
| Phosphorus (P) | ≤ 0.030 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 0.60 - 0.90 |
| Nickel (Ni) | 1.60 - 2.00 |
| Molybdenum (Mo) | 0.15 - 0.30 |
| Copper (Cu) | ≤ 0.30 |
| Aluminum (Al) | 0.020 - 0.050 |
⚙️ Mechanical Properties
| Property | Value | Condition |
|---|---|---|
| Tensile Strength | 980 - 1180 MPa | Quenched & Tempered |
| Yield Strength (0.2% offset) | ≥ 835 MPa | Quenched & Tempered |
| Elongation | ≥ 12% | 50mm gauge length |
| Reduction of Area | ≥ 45% | Quenched & Tempered |
| Hardness (HRC) | 28 - 35 | Quenched & Tempered |
| Impact Energy (Charpy V-notch) | ≥ 54 J | Room Temperature |
| Fatigue Limit | 450 - 500 MPa | 10&sup7; cycles |
| Young's Modulus | 210 GPa | Room Temperature |
| Poisson's Ratio | 0.29 | Room Temperature |
🔬 Physical Properties
| Property | Value | Temperature |
|---|---|---|
| Density | 7.85 g/cm³ | 20°C |
| Melting Point | 1480 - 1520°C | - |
| Thermal Conductivity | 44.5 W/m·K | 20°C |
| Thermal Expansion Coefficient | 12.3×10-6/K | 20-100°C |
| Specific Heat Capacity | 460 J/kg·K | 20°C |
| Electrical Resistivity | 0.25 µΩ·m | 20°C |
| Magnetic Permeability | Ferromagnetic | Room Temperature |
| Curie Temperature | 770°C | - |
📏 Product Specifications
| Specification | Available Options | Standards |
|---|---|---|
| Product Forms | Round bars, square bars, flat bars, plates, sheets, forgings | JIS G4103 |
| Round Bar Diameter | 10mm - 300mm | JIS G4103 |
| Square Bar Size | 10mm - 150mm | JIS G4103 |
| Plate Thickness | 6mm - 100mm | JIS G4103 |
| Length | Up to 12 meters (custom lengths available) | Customer specification |
| Surface Finish | Hot rolled, cold drawn, peeled, ground, machined | JIS G4103 |
| Dimensional Tolerance | h9, h11 for bars; ±0.5mm for plates | JIS G4103 |
| Heat Treatment Condition | Annealed, normalized, quenched & tempered | Customer specification |
| Equivalent Standards | AISI 4340, EN 1.6565, DIN 40NiCrMo6 | International |
Let Us Create Success for Your Project
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Our Advantages in Processing JIS SNCM439
Advanced Vacuum Degassing Technology
MetalZenith utilizes state-of-the-art vacuum degassing and ladle refining processes to achieve ultra-low inclusion content and superior steel cleanliness, resulting in enhanced fatigue resistance and improved mechanical properties in JIS SNCM439 production.
Precision Heat Treatment Control
Our computer-controlled heat treatment facilities with precise temperature monitoring and atmosphere control ensure consistent microstructure and mechanical properties. Advanced quenching and tempering processes optimize the strength-toughness balance for specific application requirements.
Comprehensive Customization Capabilities
MetalZenith offers extensive customization options including non-standard dimensions, specialized surface treatments, and application-specific heat treatment schedules. Our technical team provides engineering support to optimize material properties for customer-specific requirements with global logistics support.
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