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Technical Specifications
Product Overview
Metallurgical Characteristics
Stainless Spring Steel exhibits a martensitic microstructure after heat treatment, characterized by high carbon martensite with uniformly distributed chromium carbides. The controlled chromium content ensures formation of a stable passive oxide layer while maintaining the high carbon necessary for spring properties. The fine-grained structure achieved through MetalZenith's controlled processing provides optimal balance between strength and corrosion resistance.
Heat Treatment Process
MetalZenith employs solution annealing at 1050-1100°C followed by rapid quenching and precise tempering at 200-400°C depending on target hardness. Our controlled atmosphere furnaces prevent decarburization and surface oxidation, while precise temperature control ensures uniform properties throughout the cross-section. Post-heat treatment passivation enhances corrosion resistance.
Manufacturing Process Excellence
Our manufacturing process begins with vacuum induction melting to achieve exceptional cleanliness, followed by controlled hot rolling and precision cold drawing. MetalZenith's advanced wire drawing technology with diamond dies ensures superior surface finish and dimensional accuracy. Continuous annealing and controlled cooling maintain optimal microstructure for spring applications.
Specialized Quality Testing
MetalZenith conducts comprehensive corrosion testing including pitting potential measurement (>200mV vs SCE), intergranular corrosion testing per ASTM A262 Practice A, stress corrosion cracking evaluation in chloride environments, and passivation film thickness analysis using XPS technology. Spring performance testing includes fatigue life evaluation and stress relaxation testing at elevated temperatures.
Application-Specific Considerations
For chemical equipment applications, our material meets NACE MR0175 requirements for sour service. Food industry applications comply with FDA 21CFR177.2600 for food contact surfaces. Medical device applications meet USP Class VI biocompatibility requirements. Marine applications feature enhanced pitting resistance through controlled molybdenum additions. Architectural applications benefit from superior atmospheric corrosion resistance and aesthetic appeal.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.95 - 1.20 |
| Chromium (Cr) | 16.00 - 18.00 |
| Silicon (Si) | 0.15 - 1.00 |
| Manganese (Mn) | 0.30 - 1.00 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.030 |
| Nickel (Ni) | 0.50 - 1.00 |
| Molybdenum (Mo) | 0.40 - 0.70 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Yield Strength (MPa) | 1380 - 1720 |
| Tensile Strength (MPa) | 1860 - 2170 |
| Elongation (%) | 2 - 8 |
| Hardness (HRC) | 50 - 55 |
| Corrosion Rate (mm/year) | < 0.025 |
| Fatigue Strength (MPa) | 690 - 860 |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density (g/cm3) | 7.70 |
| Melting Point (°C) | 1480 - 1530 |
| Thermal Conductivity (W/m·K) | 24.9 |
| Thermal Expansion (×10??/K) | 10.4 |
| Electrical Resistivity (μΩ·cm) | 60 |
| Elastic Modulus (GPa) | 200 |
📏 Product Specifications
| Specification | Details |
|---|---|
| Available Forms | Wire, Strip, Bar, Sheet, Custom Springs |
| Wire Diameter Range | 0.1 - 20mm |
| Strip Thickness | 0.05 - 3.0mm |
| Strip Width | 3 - 600mm |
| Standards Compliance | ASTM A313, DIN 17224, JIS G4314 |
| Heat Treatment Condition | Hardened & Tempered |
| Surface Finish | Bright, Pickled, Passivated |
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Our Advantages in Processing Stainless Spring Steel
Advanced Vacuum Melting Technology
MetalZenith utilizes state-of-the-art vacuum induction melting and electroslag remelting processes to achieve exceptional cleanliness and homogeneity in our Stainless Spring Steel. Our controlled atmosphere processing eliminates inclusions and ensures uniform chromium distribution for consistent corrosion resistance and spring performance.
Comprehensive Corrosion Testing Protocol
Our specialized testing program includes pitting potential measurement (ASTM G61), intergranular corrosion testing (ASTM A262), stress corrosion cracking evaluation (ASTM G36), and passivation film thickness analysis using XPS technology. This ensures optimal corrosion resistance for chemical processing and marine environments.
Custom Heat Treatment & Processing
MetalZenith offers tailored solution annealing and tempering cycles to optimize spring properties for specific applications. Our technical team provides comprehensive support for custom wire drawing, coiling, and surface finishing to meet exact customer specifications for medical, food, and industrial applications.
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