If you are comparing SUS329J1 and SUS329J3L duplex stainless steel for corrosion-resistant or high-strength industrial applications, understanding their differences is crucial for choosing the right material. As a professional stainless steel supplier with 18+ years of export experience, GNEE provides full-spec SUS329J1 and SUS329J3L plates, coils, pipes, and bars, complete with MTC 3.1/3.2, EN/ASTM certifications, and fast delivery.
What is SUS329J1 material?
SUS329J1 is an austenitic-ferritic duplex stainless steel according to the Japanese JIS standard, corresponding to the American standard ASTM S32900, the German standard DIN 1.4460, and the Chinese national standard 0Cr26Ni5Mo2 (S22608). Its chemical composition contains 23.00-28.00% chromium, 3.00-6.00% nickel, 1.00-3.00% molybdenum, and ≤0.08% carbon. This material undergoes solution treatment at 950-1100℃ followed by rapid cooling to form an austenitic-ferritic duplex microstructure, exhibiting both high strength and corrosion resistance.
What is SUS329J3L stainless steel?
SUS329J3L (UNS S32205, S31803) is an austenitic-ferritic duplex stainless steel with excellent corrosion resistance and strength properties. Compared with SUS316L and SUS317L, it has better resistance to localized corrosion and can be used in chemical equipment, seawater desalination equipment, etc.
SUS329J1 vs. SUS329J3L stainless steel: What are the differences?
The main difference between SUS329J1 and SUS329J3L is that they have lower carbon content and added nitrogen, which makes SUS329J3L have better corrosion resistance (especially resistance to stress corrosion cracking) and better weldability.
SUS329J1 vs. SUS329J3L stainless steel: Chemical Composition Table (wt%)
| Grade | C | Cr | Ni | Mo | N | Others |
|---|---|---|---|---|---|---|
| SUS329J1 | ≤0.08 | 23–26 | 4.5–6.5 | 1.0–2.0 | - | Balanced duplex |
| SUS329J3L | ≤0.03 (Low-carbon) | 22–24 | 5.0–7.0 | 2.5–3.5 (Higher Mo) | 0.08–0.20 (Nitrogen added) | Improved PREN |
SUS329J1 vs. SUS329J3L stainless steel: Mechanical Properties
| Property | SUS329J1 | SUS329J3L |
|---|---|---|
| Tensile Strength | 620–800 MPa | 650–880 MPa |
| Yield Strength | 450 MPa | 450–550 MPa |
| Hardness | ≤30 HRC | ≤28 HRC |
| Impact Toughness | Good | Excellent (due to N addition) |
Which is better, SUS329J1 or SUS329J3L?
SUS329J1 is a low-alloy duplex stainless steel, known for its strength and toughness in both high and low temperature environments; while SUS329J3L is a duplex stainless steel with excellent corrosion resistance, especially in resistance to pitting corrosion, crevice corrosion, and stress corrosion cracking.
Are SUS329J1 and SUS329J3L magnetic?
Yes, both SUS329J1 and SUS329J3L are magnetic to some degree. They are both duplex stainless steels, which means they have a mixed austenitic and ferritic structure, making them inherently magnetic.
Applications
SUS329J1: Typically used for various components requiring high strength and good corrosion resistance, but may require additional process control in welding applications.
SUS329J3L: Due to its excellent weldability and resistance to chloride environments, it is widely used in harsh environments such as oil well pipes, chemical transport ships, chemical plant equipment, and seawater desalination plants.
SUS329J1 vs. SUS329J3L：Price
| Material | Market Price (USD/kg) | Influencing Factors |
|---|---|---|
| SUS329J1 | $3.20 – $4.00/kg | Standard duplex alloy, moderate Mo |
| SUS329J3L | $4.50 – $6.20/kg | Higher Mo + N content, high corrosion resistance |
GNEE Supply Range (In Stock)
| Product | Size Range | Standard |
|---|---|---|
| Plates / Sheets | 0.5–50 mm | JIS / ASTM / EN |
| Coils | 0.3–10 mm | ASTM A240 |
| Pipes (Welded/Seamless) | 6–630 mm | ASTM A790 / A928 |
| Tubes for Heat Exchangers | 6–38 mm | ASTM A789 |
| Round Bar | 8–300 mm | ASTM A276 |
| Custom Parts | CNC, laser cutting | OEM services |
Certificates: ISO 9001, SGS, BV, TUV, EN10204 3.1/3.2 MTC.
Packaging & Payment Terms (Helps Increase Conversion)
Packaging: Waterproof wrapping, wooden pallets, fumigation-free boxes
Export Protection: Edge guards + moisture-proof film
Payment: T/T 30% + balance before shipment, LC at sight, OA for long-term customers
Delivery Time:
Stock items: 7–10 days
Customized sizes: 15–25 days
