321 Stainless Steel Sheet / Plate

✓ Standard:AISI, ASTM, GB, JIS, SUS

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We supply a full range of 321 stainless steel sheets and plates with reliable quality and stable performance for high-temperature and welded applications. Our 321 stainless steel sheets are available in various thicknesses, widths, surface finishes, and processing options to meet industrial, mechanical, and fabrication requirements.

Specification — 321 Stainless Steel Sheet

Item Specification
Material Grade 321 Stainless Steel
UNS No. S32100
EN Grade 1.4541
Standards ASTM A240 / A480, EN 10088, JIS G4304
Product Form Sheet / Plate
Thickness 0.3 mm – 50 mm
Width 1000 mm, 1219 mm, 1500 mm, or Custom
Length 2000 mm, 2438 mm, 3000 mm, or Custom
Surface Finish 2B, BA, No.1, No.4, HL, Mirror
Condition Annealed
Processing Service Cutting, Slitting, Polishing
Application High-temperature, Welded Structures, Industrial Fabrication

 

321 Stainless Steel Sheet / Plate

321 stainless steel is a titanium-stabilized austenitic stainless steel based on 304 chemistry. The addition of titanium (Ti ≥ 5×C) effectively prevents chromium carbide precipitation, providing excellent resistance to intergranular corrosion, especially after welding or exposure to elevated temperatures.

Compared with 304 stainless steel, 321 stainless steel sheet offers superior high-temperature stability and improved post-weld corrosion resistance, making it suitable for service temperatures up to 800°C. Customized cutting, surface treatment, and thickness control are available to meet specific application needs.

Chemical Composition (Typical, %)

Element C Si Mn P S Cr Ni Ti
321 ≤0.08 ≤1.00 ≤2.00 ≤0.045 ≤0.030 17.0–19.0 9.0–12.0 ≥5×C

Mechanical Properties (Typical)

Property Value
Tensile Strength ≥ 515 MPa
Yield Strength ≥ 205 MPa
Elongation ≥ 40%
Hardness ≤ 217 HB

 

Heat Treatment of 321 Stainless Steel Sheet / Plate

1. Solution Annealing

Temperature range: 1040–1100 °C

Process: Heating followed by rapid cooling (water quenching or air cooling)

Purpose:
Dissolves carbides, restores austenitic structure, and ensures optimal corrosion resistance and ductility.

2. Stabilization Treatment (Optional)

Applied after solution annealing or welding for critical applications.

Helps stabilize titanium carbides and further improves resistance to intergranular corrosion in long-term high-temperature service.

3. Hardening

321 stainless steel cannot be hardened by heat treatment.
Mechanical strength is mainly influenced by cold working.

Note: Heat treatment for 321 stainless steel is primarily used to improve corrosion resistance and high-temperature stability, not for strength enhancement.

Features of 321 Stainless Steel Sheet / Plate

High-Temperature Resistance:
Maintains stable mechanical properties and corrosion resistance at elevated temperatures up to 800°C.

Intergranular Corrosion Resistance:
Titanium stabilization prevents chromium carbide precipitation, making it suitable for welded components without post-weld heat treatment.

Good Weldability:
Excellent weldability using standard stainless steel welding methods with minimal risk of weld decay.

Mechanical Stability:
Good strength, ductility, and dimensional stability for fabrication and forming processes.

Alternative to 304 for High-Temperature Use:
Offers better high-temperature performance than 304 while remaining more economical than 310S.

Applications of 321 Stainless Steel Sheet / Plate

High-Temperature Equipment:
Heat exchangers, furnace components, exhaust systems
Recommended: medium to thick plates

Welded Structures:
Pressure vessels, piping systems, expansion joints
Recommended: annealed sheets for welding

Aerospace & Automotive:
Exhaust manifolds, thermal shields, engine components
Recommended: precision-cut sheets

Chemical & Petrochemical Industry:
Reactors, processing equipment, structural linings
Recommended: corrosion-resistant surfaces

Power & Energy Industry:
Boilers, superheaters, high-temperature ducts

321 stainless steel sheets are especially suitable for applications involving welding and continuous exposure to elevated temperatures, where standard 304 stainless steel may fail.

FAQ – 321 Stainless Steel Sheet / Plate

Q1: What is the difference between 321 and 304 stainless steel sheet?
321 contains titanium, which improves resistance to intergranular corrosion and high-temperature stability compared to 304.

Q2: Is 321 stainless steel sheet suitable for welding?
Yes. 321 stainless steel is specifically designed for welded applications without the need for post-weld heat treatment in most cases.

Q3: Can 321 stainless steel sheet be used at high temperatures?
Yes. It performs well at temperatures up to approximately 800°C.

Q4: Can 321 stainless steel sheet be hardened by heat treatment?
No. Like other austenitic stainless steels, it cannot be hardened by heat treatment.

Q5: Is 321 stainless steel sheet magnetic?
No. It is generally non-magnetic in annealed condition; slight magnetism may occur after cold working.

1. Standard Export Packaging

All stainless steel sheets, plates, pipes, coils, and bars are packed according to export standards to ensure safety during handling and transportation.

Sheets & Plates: Covered with PVC protective film or waterproof paper, then fixed on fumigated wooden pallets or packed in wooden cases .

Coils: Secured with steel strips and supported by steel frames to prevent deformation.

Pipes & Bars: Bundled with steel straps or packed in wooden boxes based on length and diameter.


2. Surface & Damage Protection

Packaging focuses on protecting the material surface and structural integrity.

Moisture-resistant wrapping to reduce the risk of corrosion

Edge and corner protection for sheets and plates

Firm strapping to avoid movement during container loading and unloading

This helps minimize scratches, bending, and other damage during long-distance transportation.


3. Container & Long-Distance Transportation

All packaging is suitable for container shipping and international logistics.

Stable pallet stacking for container loading

Secure fixing to prevent shifting during sea transportation

Suitable for sea, land, and multimodal transport

Products are packed to remain stable during extended transit and storage.


4. Customized Packaging Options

Packaging can be adjusted based on customer requirements.

Customized pallet sizes or reinforced packaging

Special labeling or marking for easy identification

Mixed loading arrangements for different products

Packaging details can be confirmed before shipment, and photos are available upon request.

English Name China GB/T Japan JIS USA AISI/UNS Europe EN/DIN
Austenitic Stainless Steel 201 0Cr17Mn6Ni5N SUS201 AISI 201 / UNS S20100 EN 1.4372
Austenitic Stainless Steel 202 0Cr18Mn9Ni6N SUS202 AISI 202 / UNS S20200 EN 1.4122
Austenitic Stainless Steel 301 06Cr17Ni7 SUS301 AISI 301 / UNS S30100 EN 1.4310
Austenitic Stainless Steel 303 0Cr17Ni13Mo SUS303 AISI 303 / UNS S30300 EN 1.4305
Austenitic Stainless Steel 304 0Cr18Ni9 SUS304 AISI 304 / UNS S30400 EN 1.4301
Austenitic Stainless Steel 304L 06Cr19Ni10 SUS304L AISI 304L / UNS S30403 EN 1.4307
Austenitic Stainless Steel 305 0Cr17Ni14Cu2 SUS305 AISI 305 / UNS S30500 EN 1.4303
Austenitic Stainless Steel 309S 00Cr23Ni13 SUS309S AISI 309S / UNS S30908 EN 1.4828
Austenitic Stainless Steel 310S 0Cr25Ni20 SUS310S AISI 310S / UNS S31008 EN 1.4845
Austenitic Stainless Steel 316 0Cr17Ni12Mo2 SUS316 AISI 316 / UNS S31600 EN 1.4401
Austenitic Stainless Steel 316L 00Cr17Ni12Mo2 SUS316L AISI 316L / UNS S31603 EN 1.4404
Austenitic Stainless Steel 316Ti 00Cr17Ni12Mo2Ti SUS316Ti AISI 316Ti / UNS S31635 EN 1.4571
Austenitic Stainless Steel 317 00Cr19Ni13Mo3 SUS317 AISI 317 / UNS S31700 EN 1.4438
Austenitic Stainless Steel 321 00Cr19Ni10Ti SUS321 AISI 321 / UNS S32100 EN 1.4541
Austenitic Stainless Steel 347 0Cr19Ni12Mo2Ti SUS347 AISI 347 / UNS S34700 EN 1.4550
Austenitic Stainless Steel 904L ZG0Cr19Ni25Mo4Cu2 SUS904L AISI 904L / UNS N08904 EN 1.4539
Austenitic Stainless Steel 254SMO ZG17Cr20Ni14Mo3Cu SUS312L1 AISI 254SMO / UNS S31254 EN 1.4547
Ferritic Stainless Steel 409 0Cr11Mo SUS409 AISI 409 / UNS S40900 EN 1.4512
Martensitic Stainless Steel 410 1Cr13 SUS410 AISI 410 / UNS S41000 EN 1.4006
Martensitic Stainless Steel 420 0Cr17Ni4Cu4Nb SUS420 AISI 420 / UNS S42000 EN 1.4021
Ferritic Stainless Steel 430 0Cr17 SUS430 AISI 430 / UNS S43000 EN 1.4016
Ferritic Stainless Steel 439 0Cr18Mn11Nb SUS439 AISI 439 / UNS S43900 EN 1.4517
Ferritic Stainless Steel 444 0Cr18Mn13Si SUS444 AISI 444 / UNS S44400 EN 1.4521
Ferritic Stainless Steel 446 0Cr25Mo4N SUS446 AISI 446 / UNS S44600 EN 1.4762
Martensitic Stainless Steel 416 0Cr13MoS4 SUS416 AISI 416 / UNS S41600 EN 1.4005
Duplex Stainless Steel 2205 ZG2CrNiMo SUS329J4L UNS S32205 EN 1.4462
Duplex Stainless Steel 2304 ZG0Cr23Ni5MoN SUS329J1L UNS S32304 EN 1.4362
Precipitation Hardening Stainless 17-4PH ZG0Cr17Ni4Cu4Nb SUS630 UNS S17400 EN 1.4542
Martensitic Stainless Steel 431 ZG1Cr17Ni2Mo SUS431 AISI 431 / UNS S43100 EN 1.4057

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