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Technical Specifications
Product Overview
Metallurgical Characteristics
AISI 321 is an austenitic stainless steel stabilized with titanium to prevent intergranular corrosion. The titanium content, typically 5 times the carbon content, forms stable titanium carbides that prevent chromium carbide precipitation at grain boundaries. This stabilization mechanism maintains corrosion resistance even after exposure to temperatures in the sensitization range (425-815°C).
Heat Treatment and Processing
MetalZenith employs controlled solution annealing at 1040-1120°C followed by rapid cooling to achieve optimal microstructure. Our advanced heat treatment facilities ensure uniform heating and controlled cooling rates to prevent sensitization. Cold working can be performed to increase strength, with intermediate annealing available for heavy reductions. The material exhibits excellent hot workability in the temperature range of 1150-950°C.
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 under controlled conditions with precise temperature monitoring. Cold finishing operations utilize advanced equipment to achieve tight dimensional tolerances and superior surface quality. Each processing step is monitored using statistical process control to ensure consistent quality.
Quality Standards and Certifications
MetalZenith maintains compliance with international standards including ASTM, EN, JIS, and GB specifications. Our quality management system is certified to ISO 9001:2015, AS9100D, and NADCAP standards. Comprehensive testing includes chemical analysis by optical emission spectroscopy, mechanical testing per ASTM standards, intergranular corrosion testing per ASTM A262, and non-destructive examination including ultrasonic and magnetic particle inspection. Mill test certificates and third-party inspection are available for all products.
🧪 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) | 17.0 - 20.0 |
| Nickel (Ni) | 9.0 - 12.0 |
| Titanium (Ti) | 5×C min, 0.70 max |
| Nitrogen (N) | ≤ 0.10 |
| Iron (Fe) | Balance |
⚙️ 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, Room Temp) | ≥ 120 J |
| Fatigue Limit (10&sup7; cycles) | 240 MPa |
| Young's Modulus | 200 GPa |
| Shear Modulus | 81 GPa |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density | 7.90 g/cm³ |
| Melting Point | 1400-1425°C |
| Thermal Conductivity (100°C) | 16.3 W/m·K |
| Thermal Conductivity (500°C) | 21.5 W/m·K |
| Thermal Expansion (20-100°C) | 16.6×10-6/K |
| Thermal Expansion (20-500°C) | 17.8×10-6/K |
| Specific Heat (20°C) | 500 J/kg·K |
| Electrical Resistivity (20°C) | 0.72 µΩ·m |
| Magnetic Permeability | 1.02 µr (max) |
| Curie Temperature | Non-magnetic |
📏 Product Specifications
| Specification | Available Options |
|---|---|
| Product Forms | Round Bar, Square Bar, Flat Bar, Plate, Sheet, Strip, Tube, Pipe, Wire, Forging |
| Round Bar Diameter | 6mm - 300mm |
| Plate Thickness | 3mm - 100mm |
| Sheet Thickness | 0.5mm - 6mm |
| Tube Outer Diameter | 6mm - 219mm |
| Standards | ASTM A240, A276, A312, A479, EN 10088, JIS G4303, GB/T 1220 |
| Surface Finish | Hot Rolled, Cold Rolled, Bright Annealed, Pickled, 2B, BA, No.4, HL |
| Dimensional Tolerance | ±0.1mm to ±0.5mm (depending on form and size) |
| Length | Standard: 6m, Custom: 1m - 12m |
| Condition | Annealed, Solution Treated |
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Our Advantages in Processing AISI 321
Advanced Vacuum Melting Technology
MetalZenith utilizes state-of-the-art vacuum induction melting (VIM) and electroslag remelting (ESR) processes to produce AISI 321 with exceptional chemical homogeneity and minimal inclusion content. Our controlled atmosphere melting ensures precise titanium stabilization and optimal carbide precipitation control for superior high-temperature performance.
Comprehensive Quality Control System
Our ISO 9001:2015 and AS9100D certified quality management system includes advanced spectroscopic analysis, mechanical testing, and microstructural examination. Every batch undergoes rigorous testing including intergranular corrosion testing per ASTM A262 and high-temperature oxidation resistance evaluation to guarantee consistent performance.
Custom Processing and Global Supply
MetalZenith offers extensive customization capabilities including precision machining, specialized heat treatments, and custom alloy modifications. Our global supply chain network ensures reliable delivery worldwide, while our technical support team provides engineering assistance for application-specific requirements and material optimization.
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