Xi'an Dongmeng Group Co., Ltd. is one of the most reliable manufacturers and suppliers of aisi 321 stainless steel in China, also supports customized service. With abundant experience, we warmly welcome you to wholesale cheap products in stock here and get free sample from our factory. For price consultation, contact us.
AISI 321 stainless steel (UNS S32100) is a titanium-stabilized austenitic stainless steel designed to provide excellent resistance to intergranular corrosion and oxidation in elevated temperature environments.
It performs well in the temperature range of 427°C to 816°C, making it widely used in heat exchangers, exhaust systems, boilers, refinery equipment, and chemical processing applications.
As a professional stainless steel supplier, we provide 321 stainless steel sheets, plates, coils, pipes, tubes, bars, and customized fabrication services for global industrial projects.
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High Quality
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Advanced Equipment
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Professional Team
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Custom Service
WHAT IS AISI 321 STAINLESS STEEL?
AISI 321 stainless steel is an 18-8 austenitic stainless steel similar to 304, but stabilized with titanium (Ti).
Key composition:
Chromium (Cr): 17–19%
Nickel (Ni): 9–12%
Titanium (Ti): Stabilizing element
Carbon (C): ≤0.08%
👉 Titanium binds with carbon to prevent chromium carbide formation
👉 This improves resistance to weld decay and intergranular corrosion
AISI 321 / UNS S32100 is a titanium-stabilized austenitic stainless steel that offers excellent resistance to intergranular corrosion after exposure to temperatures in the chromium carbide precipitation range (425–850°C). It maintains high strength and oxidation resistance in continuous service up to 900°C, making it a top choice for heat exchangers, furnace components, exhaust systems, and pressure vessels.
Project Case – Exhaust System Manufacturer
Client Country: Germany
Industry: Automotive & Industrial Exhaust Systems
Material Supplied:
AISI 321 Stainless Steel Sheet
Specification:
3mm × 1500mm × 3000mm
Requirement:
High temperature resistance up to 800°C
Good weldability
Resistance to oxidation and scaling
Our Solution:
Provided ASTM A240 certified 321 sheets
Controlled titanium stabilization ratio
Full PMI + surface inspection
Result:
Improved exhaust system lifespan by 20–25% under thermal cycling conditions.
Why Titanium Stabilization Matters in 321
Titanium in 321 stainless steel:
Combines with carbon to form stable TiC
Prevents chromium carbide precipitation
Avoids intergranular corrosion after welding
Maintains corrosion resistance in heat-affected zones
👉 This makes 321 ideal for welded high-temperature applications
High Temperature Performance
Continuous service: up to 800–850°C
Excellent oxidation resistance
Good creep resistance
Stable performance in thermal cycling
Chemical Composition (Typical Values)
| Element | % |
|---|---|
| C | ≤ 0.08 |
| Mn | ≤ 2.00 |
| Si | ≤ 0.75 |
| P | ≤ 0.045 |
| S | ≤ 0.030 |
| Cr | 17.0 – 19.0 |
| Ni | 9.0 – 12.0 |
| Ti | ≥ 5 × C% |
| Fe | Balance |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength (0.2% offset) | ≥ 205 MPa |
| Elongation | ≥ 40% |
| Hardness | ≤ 95 HRB |
Specifications (Metric & Imperial)
Sheet / Plate
| Thickness | Width | Length |
|---|---|---|
| 0.3–80 mm | 1000 / 1219 / 1500 / 2000 mm | 2000–6000 mm (custom) |
| 0.012–3.15 inch | 40–78 inch | 78–236 inch |
Pipes & Tubes
| Outside Diameter (OD) | Wall Thickness |
|---|---|
| 6–630 mm | 0.5–40 mm |
| 0.24–24.8 inch | 0.02–1.57 inch |
Round Bar
| Diameter | Length |
|---|---|
| 6–300 mm | 1–6 m |
| 0.24–12 inch | 3–20 ft |
Products Key Features
Titanium-stabilized against carbide precipitation
Excellent resistance to intergranular corrosion
High-temperature strength up to 900°C
Good weldability and formability
Suitable for continuous thermal cycling environments
Ideal alternative to 304/304L in heat-resistant applications
321 vs 304 vs 321H
| Property | 304 | 321 | 321H |
|---|---|---|---|
| Stabilizer | None | Titanium | Titanium |
| High Temp Resistance | Medium | High | Higher |
| Creep Resistance | Low | Medium | High |
| Weld Stability | Low | High | High |
| Application | General use | Heat resistant use | Heavy-duty high temp |
Products Applications
Heat exchangers & condensers
Aerospace engine components
Exhaust manifolds & automotive heat shields
Thermal processing equipment
Petrochemical pipelines
High-temperature structural parts
Pressure vessels & boilers
Standards & Compliance
AISI 321 (UNS S32100) complies with:
ASTM A240 / A312 / A213 / A276
ASME SA240
EN 1.4541
UNS S32100
Widely used in chemical, automotive, and power generation industries.
Inspection & Quality Assurance
100% material identification (PMI testing)
Surface inspection: Ra measurement, visual & dimensional checks
Mechanical property tests: tensile, hardness, impact
Non-destructive tests: UT / RT / Eddy Current
Third-party inspection available (SGS, BV, TUV, LR)
Mill Test Certificate EN 10204 3.1 provided
Product Delivery Standards
Standard export seaworthy packaging
Plastic film + waterproof wrapping + steel pallet
Pipe/tube: end caps + bundle packing
Support for container loading reinforcement
Delivery terms: FOB / CFR / CIF / EXW
Fast production cycle for customized orders
We supply stainless steel coils, sheets, plates, pipes, tubes, bars, and custom fabrication for global industrial buyers. Contact us for quotes, samples, or technical support.
Our address
Room 4107, Runfeng Building, Sanqiao New Street, Weiyang District, Xi'an City, Shaanxi Province
Phone Number
+86 15769214734
office@dongmjd.com
FAQ
Q1: What is the main advantage of AISI 321 over 304 stainless steel?
AISI 321 is titanium-stabilized, offering better resistance to intergranular corrosion and improved high-temperature performance.
Q2: Is AISI 321 suitable for continuous high-temperature service?
Yes. It maintains stable strength and oxidation resistance up to 900°C, ideal for exhaust systems and heat exchangers.
Q3: Do you supply AISI 321 with MTC and third-party inspection?
Yes. We provide EN 10204 3.1 MTC, and SGS / BV / TUV inspections are available upon request.
Q4: What product forms do you offer in AISI 321?
Sheets, plates, coils, pipes, tubes, bars, and custom-fabricated parts.
Q5: What surface finishes are available?
2B, BA, No.4, HL, polished, mirror, hot-rolled black, pickled.
Q6: Can AISI 321 be welded without sensitization?
Yes. Titanium stabilization helps prevent carbide precipitation during welding.
Q7: Do you offer customized sizes or processing?
Yes. Cutting, bending, polishing, beveling, welding, and CNC machining are all available.
Q8: What are the typical packaging and shipping options?
Standard export seaworthy packing: waterproof film, strapped pallets, pipe end caps, and reinforced container loading.
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