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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
JIS SUS321 is an austenitic stainless steel stabilized with titanium additions, which form stable titanium carbides (TiC) that prevent chromium carbide precipitation at grain boundaries. This stabilization mechanism ensures excellent intergranular corrosion resistance and maintains mechanical properties at elevated temperatures up to 900°C. The austenitic microstructure provides superior ductility and toughness compared to ferritic grades.
Heat Treatment Process
MetalZenith employs precise solution annealing at 1050-1100°C followed by rapid cooling to achieve optimal microstructure. The titanium stabilization eliminates the need for stabilizing heat treatments, making this grade suitable for welding applications without post-weld heat treatment. Our controlled atmosphere furnaces ensure consistent grain size and prevent surface oxidation during processing.
Manufacturing Process Excellence
Our integrated production process begins with vacuum induction melting using premium raw materials, followed by electroslag remelting for enhanced cleanliness. Hot rolling is performed using computer-controlled rolling mills with precise temperature monitoring. Cold rolling and annealing cycles are optimized to achieve target mechanical properties and surface quality. Final processing includes precision cutting, surface finishing, and comprehensive quality testing.
Quality Standards & Certifications
MetalZenith maintains compliance with international standards including JIS G4303, ASTM A240, EN 10088-2, and GB/T 3280. Our quality management system is certified to ISO 9001:2015, AS9100D for aerospace applications, and NADCAP for special processes. Each batch undergoes comprehensive testing including chemical analysis by optical emission spectroscopy, mechanical testing per ASTM standards, ultrasonic inspection for internal soundness, and dimensional verification using coordinate measuring machines.
🧪 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | ≤ 0.08 |
| Silicon (Si) | ≤ 1.00 |
| Manganese (Mn) | ≤ 2.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 17.00 - 20.00 |
| Nickel (Ni) | 9.00 - 13.00 |
| Titanium (Ti) | 4×C - 0.60 |
| Nitrogen (N) | ≤ 0.10 |
| Iron (Fe) | Balance |
⚙️ Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength (Rm) | ≥ 520 MPa |
| Yield Strength (Rp0.2) | ≥ 205 MPa |
| Elongation (A50) | ≥ 40% |
| Hardness (HRB) | ≤ 95 |
| Hardness (HV) | ≤ 200 |
| Impact Energy (KV) | ≥ 120 J |
| Young's Modulus | 200 GPa |
| Fatigue Limit | 240 MPa |
| Reduction of Area | ≥ 60% |
🔬 Physical Properties
| Property | Value |
|---|---|
| Density | 7.90 g/cm³ |
| Melting Point | 1400-1450°C |
| Thermal Conductivity (20°C) | 16.2 W/m·K |
| Thermal Conductivity (100°C) | 17.8 W/m·K |
| Thermal Expansion (20-100°C) | 16.6×10-6/K |
| Thermal Expansion (20-300°C) | 17.5×10-6/K |
| Specific Heat Capacity | 500 J/kg·K |
| Electrical Resistivity (20°C) | 0.72 µΩ·m |
| Magnetic Permeability | 1.02 µr |
| Poisson's Ratio | 0.29 |
📏 Product Specifications
| Specification | Available Options |
|---|---|
| Product Forms | Sheets, Plates, Bars, Rods, Tubes, Pipes, Coils, Strips |
| Sheet Thickness | 0.3 - 6.0 mm |
| Plate Thickness | 6.0 - 100 mm |
| Bar Diameter | 6 - 300 mm |
| Tube Outer Diameter | 6 - 610 mm |
| Standards | JIS G4303, ASTM A240, EN 10088-2, GB/T 3280 |
| Surface Finish | 2B, BA, No.4, HL, Mirror, Pickled |
| Tolerance | ±0.02 - ±0.15 mm (thickness dependent) |
| Length | 2000 - 12000 mm (customizable) |
| Width | 1000 - 2000 mm (sheets/plates) |
Let Us Create Success for Your Project
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Our Advantages in Processing JIS SUS321
Advanced Vacuum Melting Technology
MetalZenith employs state-of-the-art vacuum induction melting (VIM) and electroslag remelting (ESR) processes to achieve superior chemical homogeneity and ultra-low inclusion content in JIS SUS321, ensuring exceptional high-temperature performance and reliability.
Comprehensive Quality Control System
Our integrated quality management system features real-time chemical analysis, advanced mechanical testing, ultrasonic inspection, and dimensional verification at every production stage, guaranteeing consistent material properties and full compliance with international standards.
Global Supply Chain Excellence
MetalZenith offers extensive customization capabilities including precision cutting, surface finishing, and heat treatment services, supported by our worldwide distribution network ensuring timely delivery and comprehensive technical support for all JIS SUS321 applications.
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