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We have 20 years of industry experience, have partnered with over 1,000 brands, and support any customization needs.
Technical Specifications
Product Overview
Metallurgical Characteristics
AISI 309S is an austenitic stainless steel with a face-centered cubic crystal structure that provides excellent ductility and toughness across a wide temperature range. The high chromium content (22-24%) combined with nickel (12-15%) creates a stable austenitic matrix with superior oxidation resistance at elevated temperatures up to 1000°C. The controlled carbon content (≤0.08%) minimizes carbide precipitation, enhancing intergranular corrosion resistance.
Heat Treatment Processes
MetalZenith employs precise solution annealing at 1050-1100°C followed by rapid cooling to achieve optimal microstructure. This process dissolves carbides and ensures uniform austenitic grain structure. Stress relief annealing at 850-900°C may be applied for components requiring dimensional stability. Our controlled atmosphere furnaces prevent surface oxidation during heat treatment.
Manufacturing Process Excellence
Our manufacturing process begins with vacuum induction melting using premium raw materials, followed by electroslag remelting for enhanced cleanliness. Hot rolling is performed within precise temperature ranges (1150-950°C) to achieve optimal mechanical properties. Cold working capabilities include precision rolling, drawing, and forming operations with intermediate annealing cycles to maintain workability.
Quality Standards & Testing
Every AISI 309S product manufactured by MetalZenith undergoes comprehensive quality verification including chemical analysis via optical emission spectroscopy, mechanical testing per ASTM standards, ultrasonic inspection for internal soundness, and dimensional verification using coordinate measuring machines. Mill test certificates provide complete traceability and compliance documentation for critical applications.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | ≤ 0.08 |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 22.0 - 24.0 |
| Nickel (Ni) | 12.0 - 15.0 |
| Iron (Fe) | Balance |
| Nitrogen (N) | ≤ 0.10 |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength (Room Temperature) | ≥ 515 MPa |
| Yield Strength (0.2% Offset) | ≥ 205 MPa |
| Elongation (50mm gauge) | ≥ 40% |
| Reduction of Area | ≥ 50% |
| Hardness (Brinell) | ≤ 217 HB |
| Hardness (Rockwell B) | ≤ 95 HRB |
| Impact Energy (Charpy V-notch, 20°C) | ≥ 120 J |
| Fatigue Limit (10^7 cycles) | 240 MPa |
| Modulus of Elasticity | 200 GPa |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density | 7.98 g/cm³ |
| Melting Point | 1400-1450°C |
| Thermal Conductivity (20°C) | 14.2 W/m·K |
| Thermal Conductivity (100°C) | 16.8 W/m·K |
| Thermal Expansion (20-100°C) | 14.4×10-6/K |
| Thermal Expansion (20-300°C) | 15.9×10-6/K |
| Specific Heat Capacity | 500 J/kg·K |
| Electrical Resistivity (20°C) | 0.78 µΩ·m |
| Magnetic Permeability | 1.02 (Non-magnetic) |
| Curie Temperature | Not applicable |
📏 Product Specifications
| Specification | Available Options |
|---|---|
| Product Forms | Plates, Sheets, Bars, Rods, Tubes, Pipes, Forgings, Coils |
| Plate Thickness | 6mm - 200mm |
| Sheet Thickness | 0.5mm - 6mm |
| Bar Diameter | 6mm - 300mm |
| Tube Outer Diameter | 6mm - 610mm |
| Standards Compliance | ASTM A240, A479, A276, EN 10088-2, JIS G4305, GB/T 24511 |
| Surface Finishes | 2B, BA, No.4, HL, Mirror, Pickled, Annealed |
| Dimensional Tolerance | ±0.1mm to ±0.5mm (depending on form and size) |
| Length Options | Standard lengths or cut to customer specifications |
| Edge Conditions | Mill edge, Slit edge, Sheared edge, Flame cut |
Let Us Create Success for Your Project
Professional Team, Premium Products, Complete Service - Your Project Success is Our Mission
Our Advantages in Processing AISI 309S
Advanced Vacuum Melting Technology
MetalZenith utilizes cutting-edge vacuum induction melting (VIM) and electroslag remelting (ESR) processes to achieve exceptional chemical homogeneity and eliminate inclusions, resulting in superior high-temperature performance and extended service life for AISI 309S components.
Comprehensive Quality Control System
Our integrated quality management system features real-time process monitoring, advanced spectroscopic analysis, and mechanical testing laboratories. Every AISI 309S product undergoes rigorous inspection including ultrasonic testing, dimensional verification, and surface quality assessment to ensure consistent excellence.
Custom Processing & Global Supply Chain
MetalZenith offers extensive customization capabilities including precision machining, specialized heat treatments, and custom alloy modifications. Our global distribution network ensures reliable delivery worldwide with comprehensive technical support and engineering consultation services.
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