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321 stainless steel strip is a titanium-stabilized austenitic stainless steel strip designed for high-temperature service, welded components and applications requiring resistance to intergranular corrosion. Compared with 304 stainless steel strip, AISI 321 / UNS S32100 stainless steel strip contains titanium, which helps stabilize carbon and reduce chromium carbide precipitation during exposure to elevated temperatures. This makes 321 stainless steel a practical material choice for exhaust systems, heat exchangers, expansion joints, gaskets, furnace parts, welded assemblies and industrial fabrication.
Xi'an Dongmeng Group Co., Ltd. supplies ASTM A240 / ASME SA240 321 stainless steel strip with customized thickness, width, surface finish, edge condition, hardness, precision slitting, cut-to-length, MTC 3.1 and export seaworthy packing. Public material references identify Type 321 as a titanium-stabilized chromium-nickel austenitic stainless steel with corrosion resistance similar to 304/304L, commonly used where high-temperature exposure is an issue.
321 stainless steel strip overview
321 stainless steel strip is produced from 321 stainless steel coil through cold rolling, annealing, pickling, skin-pass finishing and precision slitting. It combines the corrosion resistance of 18-8 austenitic stainless steel with improved resistance to intergranular corrosion after welding or high-temperature exposure.
The key feature of 321 stainless steel is the addition of titanium. Titanium has a stronger affinity for carbon than chromium, so it helps reduce chromium carbide formation at grain boundaries. This improves stability in the carbide precipitation temperature range and makes 321 suitable for heat-resistant and welded applications.
For B2B buyers, 321 stainless steel strip is often selected when the final product must withstand repeated heating, welding, forming or continuous exposure to elevated temperatures. It is widely used in automotive exhaust systems, industrial gaskets, heat shields, furnace components, bellows, expansion joints and chemical processing equipment.
Core Advantages
1. Titanium Stabilized Austenitic Stainless Steel
321 stainless steel strip contains titanium stabilization, improving resistance to intergranular corrosion after welding and high-temperature exposure.
2. Better High-temperature Stability than 304
321 is commonly selected for applications where heat is a key factor. Some public material references describe 321 as suitable for applications up to about 900°C, while 304 is usually used at lower temperatures.
3. Good Forming and Fabrication Performance
321 stainless steel strip can be used for bending, stamping, forming, corrugating and precision fabrication.
4. Suitable for Welded Components
321 is useful for welded assemblies that will later experience elevated temperature service, because titanium stabilization helps reduce intergranular corrosion risk.
5. Custom Precision Slitting
Narrow strip width, tight tolerance, slit edge, deburred edge, round edge and custom coil weight can be supplied according to customer requirements.
6. Industrial Heat-resistant Applications
Ideal for exhaust systems, gaskets, heat exchangers, furnace parts, bellows and high-temperature industrial components.
Specification Table
| Item | Available Range |
|---|---|
| Product | 321 Stainless Steel Strip |
| Grade | AISI 321 / UNS S32100 / EN 1.4541 / X6CrNiTi18-10 |
| Material Type | Titanium Stabilized Austenitic Stainless Steel |
| Standard | ASTM A240 / ASME SA240 / EN 10088 / JIS G4305 |
| Surface Finish | 2B, BA, No.1, No.4, HL, polished, PVC coated |
| Thickness | 0.05–3.0 mm, customized |
| Width | 5–600 mm, customized |
| Coil ID | 300 mm / 400 mm / 508 mm / 610 mm |
| Edge | Slit edge, round edge, deburred edge, smooth edge |
| Hardness | Soft, 1/4 hard, 1/2 hard, full hard, customized |
| Processing | Precision slitting, cut-to-length, edge treatment, PVC film |
| Certificate | MTC 3.1 / EN 10204 3.1 / third-party inspection |
| Packing | Waterproof paper, wooden pallet, metal pallet, export seaworthy packing |
Chemical Composition
| Element | ASTM A240 Type 321 / UNS S32100 Typical Range |
|---|---|
| C | ≤ 0.08 |
| Mn | ≤ 2.00 |
| P | ≤ 0.045 |
| S | ≤ 0.030 |
| Si | ≤ 0.75 |
| Cr | 17.00–19.00 |
| Ni | 9.00–12.00 |
| N | ≤ 0.10 |
| Ti | 5 × (C + N) to 0.70 max |
| Fe | Balance |
ASTM A240 Type 321 / UNS S32100 composition tables commonly list chromium at 17.0–19.0%, nickel at 9.0–12.0%, and titanium at 5 × (C+N) to 0.70% max.
Mechanical Properties
| Property | ASTM A240 Type 321 Typical Requirement |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength | ≥ 205 MPa |
| Elongation | ≥ 40% |
| Hardness | ≤ 217 HBW / ≤ 95 HRB |
| Condition | Annealed / Cold Rolled according to order |
Public ASTM A240 Type 321 data lists minimum tensile strength of 515 MPa, minimum yield strength of 205 MPa and minimum elongation of 40%.
For precision strip orders, final mechanical properties can be adjusted by cold rolling and annealing condition. The final hardness, tensile strength and elongation should be confirmed according to customer drawing, application and final MTC.
Physical Properties
| Property | Typical Value / Description |
|---|---|
| Density | Approx. 7.9–8.0 g/cm³ |
| Structure | Austenitic stainless steel |
| Magnetic Property | Generally non-magnetic in annealed condition |
| Heat Resistance | Better stability than 304 in selected elevated-temperature applications |
| Oxidation Resistance | Suitable for high-temperature service within proper conditions |
| Welded Corrosion Resistance | Improved by titanium stabilization |
Surface Finish Options
2B Finish
Smooth cold rolled finish suitable for general strip applications, stamping, gaskets and industrial components.
BA Finish
Bright annealed finish for clean surface, better reflectivity and applications requiring improved appearance.
No.1 Finish
Hot rolled, annealed and pickled surface for thicker strip and industrial applications.
No.4 / HL Finish
Brushed or hairline surface for decorative or functional surface requirements.
Polished / PVC Coated
Polished strip and PVC film protection can be supplied for surface-sensitive parts.
Processing Performance Analysis
321 stainless steel strip offers good processing performance for industrial manufacturing. However, for precision parts, edge quality, hardness, flatness and surface cleanliness must be controlled carefully.
Precision Slitting
321 stainless steel coil can be slit into narrow strip widths according to customer drawings. Burr control is important for gaskets, springs, clamps and electronic components.
Edge Treatment
Slit edge, deburred edge and round edge can be supplied to improve safety, assembly performance and downstream forming quality.
Stamping and Forming
321 stainless steel strip can be stamped and formed into heat shields, clips, brackets, gaskets, flexible parts and industrial components.
Corrugating and Bellows Forming
321 stainless steel strip is often used for expansion joints and bellows because it combines formability with high-temperature stability.
Cut-to-Length
Strip can be supplied in coils or cut into fixed-length pieces according to production requirements.
Welding Performance Analysis
321 stainless steel has good welding characteristics, but filler metal selection should be handled carefully. AZoM notes that 321 itself is not recommended as a welding consumable because titanium does not transfer well across a high-temperature arc, and 347 is often preferred as the consumable for welding 321.
Recommended welding notes:
Use suitable filler material, commonly 347-type filler where required.
Control heat input during welding.
Clean surface before welding to avoid contamination.
Use 321 when welded parts will face elevated temperature service.
Pickling and passivation may be required after welding.
For critical parts, welding procedure qualification is recommended.
Corrosion Resistance Analysis
321 stainless steel strip has corrosion resistance similar to 304 stainless steel in many environments, but it offers improved resistance to intergranular corrosion after welding or elevated-temperature exposure because of titanium stabilization.
| Environment | 321 Stainless Steel Strip Suitability |
|---|---|
| General atmospheric environment | Good |
| High-temperature industrial service | Good |
| Welded components exposed to heat | Good |
| Exhaust systems | Good |
| Food and chemical equipment | Good in selected environments |
| Marine chloride environment | Limited; consider 316L / 2205 |
| Strong acid or strong chloride service | Not recommended without corrosion evaluation |
| Decorative mirror applications | Not ideal; 304 / 316L may polish better |
Applications
Automotive Exhaust Systems
321 stainless steel strip is widely used for heat-resistant exhaust components, flexible connectors, catalytic converter parts, heat shields and exhaust gaskets.
Heat Exchangers
Used for heat exchanger components, fins, plates, seals and parts exposed to elevated temperature cycles.
Expansion Joints and Bellows
321 strip offers formability and high-temperature stability, making it suitable for bellows, expansion joints and flexible metal components.
Industrial Gaskets and Seals
Used for high-temperature gaskets, sealing strips, flange gaskets and precision stamped gasket parts.
Furnace and Thermal Equipment
Suitable for furnace parts, heat treatment components, thermal shields, burners and high-temperature fixtures.
Chemical Processing Equipment
Used for selected chemical equipment parts, welded components, heat-resistant cladding and process-related assemblies.
Springs, Clips and Precision Parts
Precision 321 stainless steel strip can be used for springs, clamps, clips, brackets and formed metal parts requiring strength and heat resistance.
321 Stainless Steel Strip vs 304 Stainless Steel Strip
| Item | 321 Stainless Steel Strip | 304 Stainless Steel Strip |
|---|---|---|
| Alloy Type | Titanium stabilized austenitic stainless steel | Standard austenitic stainless steel |
| Stabilizing Element | Titanium | No Ti stabilization |
| High-temperature Stability | Better for elevated-temperature service | General use |
| Intergranular Corrosion Resistance After Heating | Better | Lower than stabilized grades |
| Welded Heat Service | Better choice | Suitable for general welding |
| Cost | Usually higher | Usually more economical |
| Typical Applications | Exhaust systems, gaskets, heat exchangers, furnace parts | General fabrication, kitchenware, decoration, equipment |
| Best For | Heat + welding + corrosion stability | General corrosion resistance and forming |
321 Stainless Steel Strip vs 316L Stainless Steel Strip
| Item | 321 Stainless Steel Strip | 316L Stainless Steel Strip |
|---|---|---|
| Key Feature | Titanium stabilization and heat resistance | Molybdenum-bearing chloride resistance |
| Best Environment | High-temperature / welded heat service | Chloride / marine / chemical service |
| Stabilization | Ti stabilized | Low carbon |
| Magnetic Property | Generally non-magnetic | Generally non-magnetic |
| Typical Use | Exhaust, furnace, heat exchangers, gaskets | Marine, food, chemical, medical, corrosion service |
| Selection Logic | Choose 321 for heat exposure | Choose 316L for chloride corrosion |
321 vs 321H Stainless Steel Strip
| Item | 321 Stainless Steel Strip | 321H Stainless Steel Strip |
|---|---|---|
| Carbon Level | ≤ 0.08% | Higher controlled carbon range |
| Main Advantage | General heat-resistant stabilized grade | Better high-temperature strength |
| Typical Use | Exhaust, gaskets, expansion joints, industrial parts | High-temperature pressure equipment |
| Availability | More common | Project-based supply |
| Selection | General strip and fabricated parts | Higher temperature strength requirement |
Inspection & Quality Assurance
Xi'an Dongmeng Group Co., Ltd. provides strict inspection for 321 stainless steel strip before shipment.
| Inspection Item | Description |
|---|---|
| Raw Material Verification | Grade, heat number, coil number and standard verification |
| Chemical Composition | Cr, Ni, Ti, C, Mn, Si, P, S content verification |
| Thickness Inspection | Micrometer measurement across width and length |
| Width Inspection | Slit width and tolerance control |
| Surface Inspection | 2B / BA / No.1 surface, scratches, dents, stains and roll marks |
| Edge Quality | Slit edge, burr control, deburred edge and round edge check |
| Hardness Test | Soft, 1/4 hard, 1/2 hard, full hard condition verification |
| Mechanical Test | Tensile strength, yield strength and elongation |
| Flatness Check | Strip flatness and coil shape inspection |
| PMI Test | Grade confirmation available |
| MTC | EN 10204 3.1 certificate available |
| Third-party Inspection | SGS, BV, TUV or customer-appointed inspection accepted |
Packaging & Shipping
Coil eye-to-wall or eye-to-sky packing
Waterproof paper and plastic film wrapping
Wooden pallet or metal pallet support
Edge protection for precision slit strip
Paper interleaving available for surface-sensitive strip
PVC film protection available
Inner and outer ring protection
Clear label with grade, size, heat number and coil number
Export seaworthy packing
Container loading photos available
Why Choose Xi'an Dongmeng Group Co., Ltd.
Precision Stainless Steel Strip Supply
Customized thickness, width, edge condition, surface and hardness can be supplied according to buyer drawings.
321 Heat-resistant Grade Expertise
321 stainless steel strip is suitable for high-temperature and welded industrial components.
Strict Slitting Tolerance Control
Precision slitting, burr control, edge trimming and coil shape inspection help reduce downstream processing problems.
Full Material Documentation
MTC 3.1, EN 10204 certificate, PMI and third-party inspection can be arranged.
Export Packing for Narrow Strip
We provide strong packaging to protect strip edges, surfaces and coil shape during international transportation.
FAQ
1. What is 321 stainless steel strip?
321 stainless steel strip is a titanium-stabilized austenitic stainless steel strip used for high-temperature, welded and corrosion-resistant industrial applications.
2. What is the difference between 321 and 304 stainless steel strip?
321 contains titanium stabilization, giving it better resistance to intergranular corrosion after welding or high-temperature exposure. 304 is more commonly used for general corrosion resistance.
3. Is 321 stainless steel strip heat resistant?
Yes. 321 stainless steel is commonly selected for heat-related applications such as exhaust systems, heat exchangers, furnace parts and thermal equipment.
4. Can 321 stainless steel strip be welded?
Yes. 321 can be welded, but suitable filler material and welding procedure should be selected. 347-type filler is often used when welding 321.
5. What surface finishes are available?
2B, BA, No.1, No.4, HL, polished and PVC-coated surfaces can be supplied.
6. Can you supply narrow 321 stainless steel strip?
Yes. Precision slitting is available for narrow strip widths according to customer requirements.
7. Can you provide deburred or round edge strip?
Yes. Slit edge, deburred edge and round edge can be supplied depending on application and order quantity.
8. What hardness can you supply?
Soft, 1/4 hard, 1/2 hard, full hard and customized hardness conditions can be supplied according to final use.
9. Can you provide MTC 3.1?
Yes. EN 10204 3.1 material test certificate can be supplied with shipment.
10. What information should I provide for quotation?
Please provide grade, standard, thickness, width, surface, edge type, hardness, coil weight, quantity, destination port and certificate requirements.
Contact Us
Xi'an Dongmeng Group Co., Ltd.
Phone / WhatsApp / WeChat: +8615769214734
Email: office@dongmjd.com
Looking for 321 stainless steel strip price, datasheet or MTC sample? Contact us today for a fast quotation.
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