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Technical Specifications
Product Overview
Metallurgical Characteristics
UNS S31254 is a super austenitic stainless steel with a fully austenitic microstructure at room temperature. The high nitrogen content stabilizes the austenite phase and significantly enhances strength and corrosion resistance. The elevated molybdenum and chromium levels provide exceptional resistance to pitting and crevice corrosion, with a PREN value exceeding 42.
Heat Treatment Process
MetalZenith applies solution annealing at 1100-1150°C followed by rapid water quenching to achieve optimal properties. This treatment dissolves carbides and ensures uniform austenitic structure. Stress relief annealing at 850-950°C may be applied for welded components to minimize residual stresses without compromising corrosion resistance.
Manufacturing Process
Our production begins with vacuum induction melting of premium raw materials, followed by electroslag remelting for enhanced cleanliness. Hot working is performed between 1050-1200°C with careful temperature control to prevent sigma phase formation. Cold working and intermediate annealing cycles achieve final dimensions and surface quality.
Quality Standards & Testing
Every batch undergoes comprehensive testing including chemical analysis by optical emission spectroscopy, mechanical property verification, intergranular corrosion testing per ASTM A262, and critical pitting temperature determination. Non-destructive testing includes ultrasonic inspection and dye penetrant testing to ensure structural integrity.
Welding & Fabrication
UNS S31254 exhibits excellent weldability using matching filler metals such as ER2594. Pre-heating is not required, and interpass temperature should be maintained below 150°C. Post-weld heat treatment is generally not necessary, but solution annealing may be applied for maximum corrosion resistance in critical applications.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | ≤ 0.020 |
| Manganese (Mn) | ≤ 1.00 |
| Silicon (Si) | ≤ 0.80 |
| Phosphorus (P) | ≤ 0.030 |
| Sulfur (S) | ≤ 0.010 |
| Chromium (Cr) | 19.5 - 20.5 |
| Nickel (Ni) | 17.5 - 18.5 |
| Molybdenum (Mo) | 6.0 - 6.5 |
| Nitrogen (N) | 0.18 - 0.22 |
| Copper (Cu) | 0.50 - 1.00 |
| Iron (Fe) | Balance |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength (Rm) | ≥ 650 MPa |
| Yield Strength (Rp0.2) | ≥ 300 MPa |
| Elongation (A5) | ≥ 35% |
| Hardness (HB) | ≤ 250 |
| Impact Energy (KV) at 20°C | ≥ 100 J |
| Young's Modulus | 200 GPa |
| Fatigue Limit (107 cycles) | 280 MPa |
| Reduction of Area | ≥ 60% |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density | 8.0 g/cm³ |
| Melting Point | 1320-1390°C |
| Thermal Conductivity (20°C) | 14 W/m·K |
| Thermal Expansion (20-100°C) | 16×10-6/K |
| Specific Heat Capacity | 500 J/kg·K |
| Electrical Resistivity (20°C) | 0.85 µΩ·m |
| Magnetic Permeability | 1.02 µr |
| Curie Temperature | Non-magnetic |
📏 Product Specifications
| Specification | Details |
|---|---|
| Available Forms | Plates, Sheets, Bars, Rods, Tubes, Pipes, Forgings |
| Plate Thickness | 3-150 mm |
| Sheet Thickness | 0.5-6 mm |
| Bar Diameter | 6-300 mm |
| Tube OD Range | 6-610 mm |
| Standards | ASTM A240, A276, A312, A479, EN 10088, JIS G4305 |
| Surface Finishes | 2B, BA, No.4, HL, Mirror, Pickled |
| Dimensional Tolerance | ±0.1mm to ±3mm (depending on form) |
| Length | Up to 12 meters (custom lengths available) |
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Our Advantages in Processing UNS S31254
Advanced Vacuum Melting Technology
MetalZenith employs state-of-the-art vacuum induction melting (VIM) and electroslag remelting (ESR) processes to produce UNS S31254 with superior cleanliness, homogeneous microstructure, and precise chemical composition control, ensuring optimal corrosion resistance and mechanical properties.
Comprehensive Quality Control System
Our integrated quality management system includes real-time chemical analysis, advanced mechanical testing, ultrasonic inspection, and specialized corrosion testing. Every batch undergoes rigorous PREN (Pitting Resistance Equivalent Number) verification to guarantee superior performance in chloride environments.
Custom Processing & Global Supply
MetalZenith offers extensive customization capabilities including precision machining, heat treatment optimization, and specialized surface finishes. Our global distribution network ensures reliable delivery of UNS S31254 products worldwide with comprehensive technical support and engineering consultation services.
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