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Technical Specifications
Product Overview
Metallurgical Characteristics
EN 1.4125 is a high-carbon martensitic stainless steel with a complex microstructure consisting of martensite matrix with uniformly distributed chromium carbides. The high carbon content (0.95-1.20%) combined with chromium (16-18%) provides exceptional hardness and wear resistance while maintaining adequate corrosion resistance. The steel exhibits excellent hardenability and can achieve uniform hardness throughout substantial cross-sections.
Heat Treatment Process
MetalZenith's optimized heat treatment process begins with annealing at 850-900°C followed by slow cooling to achieve maximum machinability. Hardening is performed by austenitizing at 1010-1050°C, followed by oil or air quenching to achieve maximum hardness. Tempering at 150-200°C reduces brittleness while maintaining high hardness (58-62 HRC). Multiple tempering cycles ensure stress relief and dimensional stability.
Manufacturing Process Excellence
Our manufacturing process utilizes vacuum induction melting (VIM) for initial melting, followed by electroslag remelting (ESR) to achieve exceptional cleanliness and homogeneity. Hot forging and rolling operations are performed within controlled temperature ranges to optimize grain structure. Cold working operations include precision drawing, grinding, and machining to achieve tight dimensional tolerances and superior surface finish.
Quality Standards & Testing
MetalZenith maintains compliance with international standards including EN 10088-3, ASTM A276, and JIS G4303. Our comprehensive testing protocol includes chemical analysis by optical emission spectroscopy, mechanical testing per ASTM E8, hardness testing per ASTM E18, and ultrasonic inspection per ASTM A388. Microstructure analysis and grain size determination ensure optimal metallurgical properties. All products are supplied with certified test reports and full material traceability documentation.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.95 - 1.20 |
| Silicon (Si) | ≤ 1.00 |
| Manganese (Mn) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 16.00 - 18.00 |
| Molybdenum (Mo) | 0.40 - 0.80 |
| Nickel (Ni) | ≤ 0.60 |
| Copper (Cu) | ≤ 0.50 |
| Nitrogen (N) | ≤ 0.11 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength (Hardened & Tempered) | 1900 - 2100 MPa |
| Yield Strength (0.2% Proof) | ≥ 1650 MPa |
| Elongation (A5) | 2 - 8% |
| Reduction of Area | 15 - 25% |
| Hardness (Hardened & Tempered) | 58 - 62 HRC |
| Hardness (Annealed) | ≤ 269 HB |
| Impact Energy (Charpy V-notch at 20°C) | 15 - 25 J |
| Fatigue Limit (107 cycles) | 800 - 900 MPa |
| Young's Modulus | 200 - 220 GPa |
| Shear Modulus | 81 GPa |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density | 7.70 g/cm³ |
| Melting Point | 1450 - 1510°C |
| Thermal Conductivity (20°C) | 24.2 W/m·K |
| Thermal Expansion Coefficient (20-100°C) | 10.4×10-6/K |
| Thermal Expansion Coefficient (20-200°C) | 10.8×10-6/K |
| Specific Heat Capacity | 460 J/kg·K |
| Electrical Resistivity (20°C) | 0.60 µΩ·m |
| Magnetic Permeability (Hardened) | Ferromagnetic |
| Magnetic Permeability (Annealed) | Ferromagnetic |
| Curie Temperature | ~750°C |
📏 Product Specifications
| Specification | Available Options |
|---|---|
| Product Forms | Round bars, flat bars, plates, sheets, strips, wire, tubes |
| Round Bar Diameter | 6 - 300 mm |
| Flat Bar Dimensions | 10-100 mm thickness, 20-300 mm width |
| Plate Thickness | 6 - 80 mm |
| Sheet Thickness | 0.5 - 6 mm |
| Wire Diameter | 0.1 - 10 mm |
| Surface Finish | Hot rolled, cold drawn, ground, polished, pickled |
| Condition | Annealed, hardened & tempered, solution treated |
| Standards | EN 10088, ASTM A276, A314, A479, JIS G4303, DIN 17440 |
| Dimensional Tolerance | h9 to h11 (bars), ±0.1 mm (sheets) |
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Our Advantages in Processing EN 1.4125
Advanced Vacuum Melting Technology
MetalZenith employs vacuum induction melting (VIM) and electroslag remelting (ESR) processes to achieve exceptional steel purity and homogeneity. Our controlled atmosphere melting eliminates inclusions and ensures uniform carbide distribution, resulting in superior mechanical properties and extended service life for critical bearing applications.
Precision Heat Treatment Excellence
Our state-of-the-art heat treatment facilities feature computer-controlled furnaces with precise temperature and atmosphere control. We achieve optimal hardness levels up to 60 HRC while maintaining excellent toughness through carefully controlled austenitizing, quenching, and tempering processes, ensuring consistent mechanical properties throughout the material cross-section.
Comprehensive Quality Control System
MetalZenith implements a rigorous quality management system with 100% chemical analysis, mechanical testing, and ultrasonic inspection. Our advanced testing laboratory provides complete material characterization including microstructure analysis, ensuring every batch meets or exceeds international standards with full traceability documentation.
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