JIS G4305 SUS321 Steel Plate | 321 Stainless Steel
What is JIS G4305 SUS321 Steel Plate?
As a professional stainless steel supplier and China Mill-Direct Exporter, SHH STEEL is pleased to present JIS G4305 SUS321 Steel Plate, also known as 321 stainless steel.
JIS G4305 SUS321 is a titanium-stabilized austenitic stainless steel under the Japanese standard for cold-rolled stainless steel plates, sheets and strips. The addition of titanium stabilizes the carbon and effectively prevents chromium carbide precipitation, giving SUS321 stainless steel excellent resistance to intergranular corrosion after welding or exposure to high temperatures. JIS G4305 SUS321 is widely used as an alternative to 304/304L in applications requiring good high-temperature strength and resistance to sensitization. SHH STEEL supplies high-quality SUS321 as Mill Direct Supply from leading Chinese stainless steel mills.
Material Specification
| Specification Element | Requirement | SHH STEEL Compliance |
|---|---|---|
| Primary Standard | JIS G4305 | Full compliance |
| Steel Grade | SUS321 | Confirmed |
| Product Form | Cold-rolled Plate / Sheet / Coil | Available |
| Surface Finish | 2B, BA, No.4, HL, polished | Available |
| Thickness Range | 0.3 mm – 6.0 mm (standard) | Custom sizes available |
| Width | Up to 1500 mm or wider | Available |
| Certification | EN 10204 3.1 / Mill Certificate | Available |
JIS G4305 SUS321 steel plate is available in various thicknesses and finishes to meet the requirements of high-temperature and welded 321 stainless steel applications.
Chemical Composition
Chemical composition of JIS G4305 SUS321 (Heat Analysis):
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.08 |
| Silicon (Si) | ≤ 1.00 |
| Manganese (Mn) | ≤ 2.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 17.00 – 19.00 |
| Nickel (Ni) | 9.00 – 12.00 |
| Titanium (Ti) | ≥ 5 × C% |
The titanium addition in SUS321 stainless steel stabilizes carbon and prevents sensitization, which is the key advantage of JIS G4305 SUS321 over standard 304 grades in welded and high-temperature service.
Mechanical Properties
Mechanical properties of JIS G4305 SUS321 (annealed condition):
| Property | Value |
|---|---|
| Yield Strength (0.2%) | ≥ 205 MPa |
| Tensile Strength | ≥ 520 MPa |
| Elongation | ≥ 40% |
| Hardness | ≤ 187 HB |
JIS G4305 SUS321 stainless steel maintains good strength and excellent toughness, making 321 stainless steel plate suitable for both fabrication and elevated-temperature service.
Density: Approximately 7.93 g/cm³ Magnetic: Non-magnetic in annealed condition.
Surface Finishes
| Finish | Description | Typical Applications |
|---|---|---|
| 2B | Cold-rolled, annealed, pickled, skin-passed | General industrial use of SUS321 |
| BA | Bright Annealed | Clean and decorative 321 applications |
| No.4 | Brushed finish | Architectural 321 stainless steel |
| HL | Hairline finish | Decorative panels |
| Polished | Mirror or custom polish | High-end 321 stainless steel products |
SHH STEEL provides JIS G4305 SUS321 steel plate in multiple surface finishes to suit both functional and aesthetic requirements of 321 stainless steel projects.
Delivery Conditions
SHH STEEL supplies JIS G4305 SUS321 as Mill Direct Supply in annealed condition with various surface finishes.
Additional options available for SUS321 stainless steel:
- Coil or cut-to-length sheets/plates
- Protective film
- Third-party inspection (SGS, BV, TUV, etc.)
Key Characteristics
- Excellent resistance to intergranular corrosion due to titanium stabilization in SUS321
- Good high-temperature strength and oxidation resistance of 321 stainless steel
- Reliable weldability of JIS G4305 SUS321 without risk of sensitization
- Suitable for continuous service up to approximately 900°C
- Non-magnetic in annealed condition
- Better performance than 304/304L in high-temperature welded applications
- Good formability and toughness of 321 stainless steel plate
Equivalent Material Grades
| Grade | Standard | Notes |
|---|---|---|
| SUS321 | JIS G4305 | — |
| 321 | ASTM A240 | American equivalent |
| 1.4541 / X6CrNiTi18-10 | EN 10088-2 | European equivalent |
| 06Cr18Ni11Ti | GB/T 3280 | Chinese equivalent |
| UNS S32100 | — | Unified Numbering System |
JIS G4305 SUS321 is fully equivalent to international 321 stainless steel grades and is widely accepted in global high-temperature and welded projects.
Applications
JIS G4305 SUS321 (321 Stainless Steel) is widely used in high-temperature and welded applications. Typical uses include:
| Application Area | Typical Components / Uses (Keywords) |
|---|---|
| High-Temperature Equipment | Exhaust systems, furnace parts – SUS321 High Temperature |
| Chemical & Petrochemical | Reactors, heat exchangers, piping – 321 Chemical |
| Aerospace & Automotive | Exhaust components, manifolds – 321 Aerospace |
| Heat Treatment Equipment | Fixtures, trays, radiant tubes – 321 Heat Treatment |
| Power Generation | Boiler components, superheaters – 321 Power |
| General Fabrication | Welded high-temperature structures – 321 Fabrication |
Why Choose SHH STEEL
SHH STEEL provides JIS G4305 SUS321 as Mill Direct Supply. We maintain long-term strategic cooperation with major Chinese stainless steel mills and act as a first-level agent. This direct mill supply model allows us to offer competitive mill-direct pricing, faster delivery times, consistent quality, and full Mill Test Certificates for JIS G4305 SUS321 Steel Plate.
Customers benefit from reliable supply of high-quality 321 stainless steel, short lead times and professional technical support for SUS321 projects worldwide.
FAQ
- What is the main advantage of SUS321 over SUS304?JIS G4305 SUS321 is titanium-stabilized, providing excellent resistance to intergranular corrosion after welding and better high-temperature performance compared with standard 304 stainless steel.
- What is the difference between SUS321 and SUS316TI?SUS321 is a titanium-stabilized 18-8 type (similar to 304), while SUS316TI contains molybdenum for better pitting resistance. Choose SUS321 for high-temperature general service and SUS316TI when chloride corrosion resistance is also required.
- What is the density of SUS321?Approximately 7.93 g/cm³ for JIS G4305 SUS321 stainless steel.
Conclusion
JIS G4305 SUS321 Steel Plate (321 Stainless Steel) from SHH STEEL is a titanium-stabilized austenitic stainless steel offering excellent intergranular corrosion resistance, good high-temperature performance and reliable weldability. As Mill Direct Supply, we provide competitive pricing, consistent quality and full technical support. Trust SHH STEEL for your SUS321 stainless steel requirements.
Contact SHH STEEL today for stock availability, pricing and technical support. JIS G4305 SUS321 Steel Plate, SUS321, 321 stainless steel, 321 stainless steel plate, SUS321 supplier
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