Specifications of Stainless Steel 321 Plates

The specifications of Stainless Steel 321 Plates, including standards, length and surface finish, are listed in the table below.

Property Details
Standards ASTM A240 / ASME SA240 / EN 10088 / JIS G4304
Size Range Width: 1000 mm – 3000 mm

Length: 2000 mm – 12000 mm
Length Single Random, Double Random, Custom Cut Length
End Type Mill Edge (ME), Slit Edge (SE)
Surface Finish 2B, No.1 (Hot Rolled), No.4, BA, Mirror Finish
Form Plates, Sheets, Coils, Shim Sheets, Foils

Available Sizes of Stainless Steel 321 Plates

The available sizes of Stainless Steel 321 Plates are listed in the table given below.

Property Details
Thickness Range 3 mm (0.118") to 80 mm (3.0″)
Standard Widths Up to 2500 mm (96″)
Standard Lengths Up to 6000 mm (240″)
Common Plate Size 48″ × 96″ (4’ × 8’)
Other Available Sizes 36″ × 96″, 48″ × 120″, 50″ × 144″
Custom Sizes Available as per client specification (cut-to-size)

Stainless Steel 321 Plates Price

In India, the price of SS 321 plates depends on thickness, size, quantity, finish, and grade, and is usually between ₹200 and ₹350 per kg. In the US market, prices range from approximately $4 to $7 per kilogram. AMS 5510-certified plates command a premium over standard ASTM A240 stock. Contact our sales team for a quotation.

Chemical Composition of Stainless Steel 321 Plates

The chemical composition of Stainless Steel 321 plates, along with their proportion in percentage, is listed below.

Carbon C
Max 0.08%
Manganese Mn
Max 2.00%
Phosphorus P
Max 0.045%
Sulfur S
Max 0.030%
Silicon Si
Max 1.00%
Chromium Cr
17.0 – 19.0%
Nickel Ni
9.0 – 12.0%
Titanium Ti
5×(C+N) min, 0.70% max
Nitrogen N
Max 0.10%

Mechanical Properties of Stainless Steel 321 Plates

The mechanical properties of Stainless Steel 321 Plates, including elongation and tensile strength, are listed below:

515 (75)
MPa (ksi)
Tensile Strength
205 (30)
MPa (ksi)
Yield Strength
35%
(min)
Elongation
217
HBW (max)
Hardness
Property Details Unit
Tensile Strength (min) 515 / 75 MPa / ksi
Yield Strength, 0.2% Offset (min) 205 / 30 MPa / ksi
Elongation in 2 in. (min) 35 %
Brinell Hardness (max) 217 HBW
Rockwell B Hardness (max) 95 HRB
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Equivalent Designations for Stainless Steel 321 Plates

International Designations equivalent to Stainless Steel 321 Plates, along with UNS and GOST, are listed in the table.

Property Details
S32100 ASTM A240, ASME SA-240
1.4541 / X6CrNiTi18-10 EN 10088-2
SUS 321 JIS G4304
06Cr18Ni11Ti / 0Cr18Ni10Ti GB/T 3280
08Kh18N10T GOST 5632
Z6CNT18-10 NF A35-572
321S31 BS 1449
SS2337 SS Standard

Stainless Steel 321 Plate Forms

Stainless Steel 321 plates are available in the following forms

  • Hot-rolled annealed and pickled (HRAP)
  • Cold-rolled forms.
  • Finishes include No. 1, 2B, 2D, and No. 4 brushed.
  • Chequered plates
  • Perforated plates
  • Shim plates

321 vs 321H Plates

Comparison of Stainless Steel 321 and 321H grades based on carbon content, strength, temperature performance, and typical industrial applications is given below.

Parameter SS 321 SS 321H
Carbon Content Max 0.08% 0.04% – 0.10%
Primary Feature Titanium-stabilised to resist intergranular corrosion Higher carbon for improved high-temperature strength
Creep Strength Moderate Higher, especially above 540°C (1000°F)
Temperature Performance Suitable for moderately elevated temperatures Preferred for prolonged high-temperature service
Code Compliance General applications Commonly specified in ASME pressure vessel codes
Applications Exhaust systems, heat exchangers, and welded structures Boilers, pressure vessels, high-temp piping
Dual Certification Possible when chemistry meets both ranges Possible when chemistry meets both ranges

Stainless Steel 321 Plates vs Stainless Steel 304 and Stainless Steel 316 Plates

Comparison of SS 304, 316, and 321 plates, focusing on their heat resistance, corrosion resistance, and performance in tough industrial conditions is given below.

Property / Feature SS 304 Plates SS 316 Plates SS 321 Plates
Alloying Elements Chromium, Nickel Chromium, Nickel, Molybdenum Chromium, Nickel, Titanium
High-Temperature Performance Moderate (up to ~500°C) Moderate Excellent (up to ~900°C continuous service)
Sensitisation Resistance Prone after prolonged heating Better than 304 Excellent (titanium stabilised)
Intergranular Corrosion Susceptible after welding/heat exposure Resistant Highly resistant
Chloride Resistance Limited Excellent (due to molybdenum) Moderate
Thermal Cycling Moderate performance Moderate Excellent
Oxidation Resistance Good Good Superior at elevated temperatures
Best Use Case General applications Marine, chemical, chloride environments High-temperature and heat-exposed applications
Cost Most economical Higher than 304 Slightly higher than 304, similar to 316

Industrial Applications of Stainless Steel 321 Plates

SS 321 plates serve industries where prolonged heat exposure and post-weld integrity are critical. The 3 primary sectors are petrochemical, aerospace, and power generation.

Petrochemical and Refinery Applications

Refineries use 321 plates for heat exchanger baffles, expansion bellows, and catalyst support trays.

Aerospace and Exhaust System Applications

AMS 5510-certified SS 321 plates are specified for aircraft exhaust collectors, firewalls, and engine shrouds. Automotive exhaust manifolds also use this grade.

Power Generation and Furnace Applications

Furnace linings, stack liners, and radiant tube supports are common power-generation uses.

Shipping & Packaging

Main export packaging setup Heavy-duty wooden boxes Packing
Export Packaging Standard

We strictly follow seaworthy export handling standards to protect stainless steel 321 plates from transit damage, moisture ingress, and surface contamination during long-distance dispatch.

  • Heavy-duty wooden boxes with moisture barrier lining
  • HDPE stretch film wrapping on all bundles
  • Edge and corner protection with plastic padding
  • Silica gel desiccants to minimize moisture exposure
  • ISPM-15 fumigated wooden packaging for export
shipping preparation Plate Bundle Yard Staging
Shipping packaging Plate Bundle Edge Protection
Shipping stock Wrapped Export-Ready Bundles

We Export Worldwide

Sachiya Steel International supplies stainless steel products to major industrial markets across North America, Europe, the Middle East, Asia and Africa with export-ready documentation and logistics support.

  • USA flagUSA
  • Canada flagCanada

Frequently Asked Questions:

What is the price of SS 321 Plate?+
SS 321 plate pricing ranges from approximately ₹200–350/kg in India and $4 to $7 per kilogram in the US. The final cost depends on thickness, dimensions, finish, and certification.
Is 321 Stainless Steel Plate better than 304 Plate for high-temperature service? +
Yes. SS 321 plates are stabilised with titanium. This prevents carbide formation when the material is used for long periods above 500°C. In comparison, SS 304 can generally only be used continuously up to about 500°C. For temperatures up to 900°C, 321 plates are the superior option.
Is 321 Stainless Steel Plate better than 316 Plate? +
It depends on the working conditions. SS 321 plates are better for high temperatures (about 500–900°C) because of the added titanium. SS 316 is better at normal room temperatures, where protection against chloride attack and pitting is more important.
What specifications cover Stainless Steel 321 Plates? +
The primary specification is ASTM A240 / ASME SA-240. Aerospace buyers may also require AMS 5510. ASTM A480 covers dimensional tolerances for flat-rolled stainless steel products.
What thickness range is available for SS 321 Plates? +
SS 321 plates are available from 3 mm to 80 mm in thickness. Standard plate widths go up to 2500 mm and lengths up to 6000 mm. Custom sizes can also be supplied on request.
What are the main applications of Stainless Steel 321 Plates? +
SS 321 plates are used in heat exchangers, joints, exhaust parts, furnace linings, and bellows. Key industries include petrochemical refining, aerospace, and power generation.
Can SS 321 Plates be welded? +
Yes. SS 321 plates are easy to weld. The added titanium protects the heated area from damage, so extra heat treatment after welding is usually not needed. Common welding methods like GTAW, GMAW, and SMAW all work well with this grade.
What is the difference between 321 and 321H Plates? +
The primary difference is carbon content. Grade 321 has 0.08% max carbon, while 321H requires 0.04–0.10%. The higher minimum carbon in 321H provides greater creep strength above 540°C. Both grades fall under ASTM A240 and can be dual-certified.

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