Stainless Steel 321 Plates and Sheets
Stainless Steel 321 plates and sheets are titanium-stabilized austenitic alloys known for their excellent resistance to intergranular corrosion and high-temperature strength. Whether you’re sourcing materials for heat exchangers, chemical processing equipment or marine applications, Lakshya Steel as your trusted 321 stainless steel sheet suppliers offer a wide range of dimensions and finishes to meet diverse industrial needs. The durable and heat-resistant 321 stainless plate is especially favored in environments above 500°C making it a reliable choice for performance and longevity.
Table of Content
- Stainless Steel 321 Sheets & Plates Specifications
- Chemical Composition of Stainless Steel 321 Plates and Sheets
- Mechanical Properties of Stainless Steel 321 Plates and Sheets
- Physical Properties of Stainless Steel 321 Plates and Sheets
- Equivalent Grades for Stainless Steel 321 Plates
- Werkstoff 1.4541 Clad Plate Dimensions
Stainless Steel Grade 321 Plates and Sheets Manufacturer & Supplier in India
What is Stainless Steel 321 Sheet Made Of?
Stainless Steel 321 sheet is an austenitic stainless steel alloy primarily composed of iron, chromium (17–19%), and nickel (9–12%) with the critical addition of titanium (≤0.70%). The presence of titanium is what differentiates SS 321 from SS 304, it stabilizes the alloy against chromium carbide precipitation during high-temperature exposure. This makes SS 321 highly resistant to intergranular corrosion especially in the heat-affected zones (HAZ) of welded components. It’s specifically formulated for high-temperature service up to 900°C (1652°F), making it ideal for aircraft exhaust systems, heat exchangers, expansion joints and thermal oxidizers. Below is a breakdown of the typical chemical composition of SS 321 sheets:
| Element | Content (% by weight) |
| Chromium (Cr) | 17.0 – 19.0 |
| Nickel (Ni) | 9.0 – 12.0 |
| Titanium (Ti) | ≥ 5x C (typically 0.30 – 0.70) |
| Carbon (C) | ≤ 0.08 |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Iron (Fe) | Balance |
Stainless Steel 321 Sheets & Plates Specifications
Whether you’re sourcing materials for fabrication or assessing compatibility with international standards, the following specifications provide a comprehensive overview of what to expect when choosing 321 stainless steel sheet or plate form:
| Property | Details |
| Grade | 321 / 321H |
| UNS Number | S32100 / S32109 |
| Werkstoff Nr. | 1.4541 (321) / 1.4878 (321H) |
| Standards | ASTM A240, ASME SA240, EN 10028-7, JIS, DIN |
| Thickness Range | 0.3 mm – 100 mm |
| Width Range | 1000 mm – 2500 mm |
| Length Range | 2000 mm – 6000 mm (custom sizes available) |
| Surface Finishes | 2B, BA, No.1, No.4, No.8 (Mirror), Satin |
| Form Options | Sheet, Plate, Coil, Shim, Roll |
| Edge Finish | Mill Edge, Slit Edge |
| Hardness | Soft, Quarter Hard, Half Hard, Full Hard |
| Temper Condition | Annealed, Hardened & Tempered |
| Manufacturing Process | Hot Rolled / Cold Rolled |
| Test Certificates | EN 10204 3.1 / 3.2, NACE MR0103 / MR0175 |
Always check for material certifications and traceability when selecting suppliers or stockists.
Chemical Composition of Stainless Steel 321 Plates and Sheets
Typical compositional ranges for stainless steel 321 grades are given in below table:
The Stainless Steel 321 chemical composition is specifically designed to enhance high-temperature stability and resistance to intergranular corrosion. Below is the typical chemical composition of Stainless Steel 321 and 321H plates and sheets, as per ASTM A240 standards:
|
Element |
SS 321 |
SS 321H |
Purpose |
|
Carbon (C) |
≤ 0.08 |
0.04 – 0.10 |
Enhances strength; controlled to avoid carbide precipitation |
|
Chromium (Cr) |
17.0 – 19.0 |
17.0 – 19.0 |
Provides corrosion resistance and oxidation protection |
|
Nickel (Ni) |
9.0 – 12.0 |
9.0 – 12.0 |
Improves toughness and resistance to scaling |
|
Manganese (Mn) |
≤ 2.00 |
≤ 2.00 |
Enhances hot working properties |
|
Silicon (Si) |
≤ 0.75 |
≤ 0.75 |
Increases oxidation resistance |
|
Phosphorus (P) |
≤ 0.045 |
≤ 0.045 |
Kept low to maintain ductility and toughness |
|
Sulfur (S) |
≤ 0.030 |
≤ 0.030 |
Controlled to reduce risk of cracking during machining |
|
Titanium (Ti) |
≥ 5x C to ≤ 0.70 |
≥ 5x C to ≤ 0.70 |
Stabilizes the alloy against intergranular corrosion |
|
Iron (Fe) |
Balance |
Balance |
Base metal |
Mechanical Behaviour of ASTM A240 Type 321 Rolling Plate
The mechanical properties of ASTM A240 Type 321 rolling plates are tailored to perform under elevated temperatures and moderate corrosive environments. These plates offer excellent tensile and yield strength while maintaining good elongation and toughness making them suitable for pressure vessels, heat exchangers and structural applications.
|
Property |
Value |
|
Tensile Strength |
≥ 515 MPa |
|
Yield Strength (0.2% Offset) |
≥ 205 MPa |
|
Elongation |
≥ 40% |
|
Hardness (Brinell) |
≤ 217 HB |
|
Modulus of Elasticity |
193 GPa |
Physical Properties of Stainless Steel 321 Plates and Sheets
Understanding its physical characteristics helps ensure proper design performance and material compatibility for thermal, structural or corrosive service conditions.
|
Property |
Value |
Unit |
Notes |
|
Density |
7.92 |
g/cm³ |
Same as SS 304; allows for easy weight calculations |
|
Melting Point |
1398 – 1446 |
°C |
High resistance to heat creep and deformation |
|
Thermal Conductivity (at 100°C) |
16.2 |
W/m·K |
Lower thermal conductivity than carbon steel |
|
Electrical Resistivity |
720 |
nΩ·m (at 20°C) |
Relatively high; not suitable for electrical applications |
|
Modulus of Elasticity |
193 |
GPa |
Indicates good structural stiffness |
|
Coefficient of Thermal Expansion |
17.2 |
µm/m·°C (0–100°C) |
Considered during thermal cycling or dissimilar metal welding |
|
Specific Heat Capacity |
500 |
J/kg·K |
Important in heat exchanger design and energy absorption |
|
Magnetic Properties |
Non-magnetic (in annealed condition) |
– |
May become slightly magnetic after cold working |
These physical properties make SS 321 plates and sheets a preferred choice in exhaust manifolds, refinery furnaces, expansion bellows and welded pressure systems. Their ability to withstand thermal cycling and mechanical stress over time adds value in critical operational environments.
Equivalent Grades for Stainless Steel 321 Plates
When sourcing or specifying stainless steel materials internationally, it’s essential to understand how Stainless Steel 321 Grade aligns with equivalents in other global standards. While the composition remains largely consistent, naming conventions and designations vary by region and standardizing body. Below is a comprehensive comparison of equivalent grades of SS 321 plates and sheets:
|
Standard |
Equivalent Grade |
Notes |
|
UNS (Unified Numbering System) |
S32100 |
Commonly used in North America |
|
EN / DIN (Europe/Germany) |
X6CrNiTi18-10 / 1.4541 |
“Werkstoff Nr. 1.4541” is widely used in EU specifications |
|
ASTM / ASME (USA) |
ASTM A240 / A312 321 |
Most commonly used standard for plates, sheets, and pipes |
|
BS (British Standard) |
321S31 |
Older British Standard, sometimes still found in legacy projects |
|
AFNOR (France) |
Z6CNT18-10 |
French designation, rarely used outside EU |
|
JIS (Japan) |
SUS 321 |
Japanese Industrial Standard; “SUS” denotes stainless steel |
|
IS (India) |
X6CrNiTi18-10 |
Adopted similar to EN/DIN standards |
|
GOST (Russia) |
08Ch18N10T |
Russian designation; includes Ti stabilization |
Werkstoff 1.4541 Clad Plate Dimensions
Werkstoff 1.4541, equivalent to SS 321, is available in clad form to enhance surface corrosion resistance while maintaining the core’s mechanical strength. These plates are commonly used in boilers, pressure vessels, and chemical plants. Below are the typical dimensions available in the market.
|
Thickness |
3 mm – 80 mm |
|
Width |
1000 mm – 2500 mm |
|
Length |
2000 mm – 6000 mm |
|
Clad Type |
SS321 over Carbon Steel or Duplex Core |
|
Cladding Ratio |
20:80, 30:70, Custom Options |
Stainless Steel TP321 Diamond Plate Applications
SS A240 TP321 diamond plates, also known as tread plates or chequered sheets, are used in flooring, walkways, ramps, and anti-slip surfaces. Their raised patterns provide traction, while the 321 grade ensures resistance to heat and oxidation in industrial settings.
|
Application |
Industry/Usage |
|
Flooring |
Chemical and Petrochemical Plants |
|
Stair Treads |
Power Plants, Railways |
|
Walkways |
Offshore Platforms |
|
Decorative Panels |
Architecture and Interior Design |
|
Loading Ramps |
Automobile & Transport Sector |
Stainless Steel 321 Plate Thickness Chart
The thickness of 321 stainless steel plates can vary significantly depending on the specific application ranging from thin gauge for decorative purposes to heavy-duty industrial thicknesses. Below is a standard thickness chart with corresponding weights per square meter:
|
Thickness (mm) |
Approx. Weight (kg/m²) |
|
0.5 |
4.00 |
|
1.0 |
8.00 |
|
2.0 |
16.00 |
|
3.0 |
24.00 |
|
5.0 |
40.00 |
|
10.0 |
80.00 |
|
20.0 |
160.00 |
UNS S32100 Rolling Sheets: Linear Thermal Expansion
Linear thermal expansion is a critical property for materials used in high-temperature environments, particularly in applications where thermal cycling or dissimilar metal joining is involved. UNS S32100, the Unified Numbering System designation for Stainless Steel 321, is known for its thermal stability and resistance to scaling at elevated temperatures.
|
Temperature Range (°C) |
Mean Coefficient of Linear Expansion |
Unit |
|
20 – 100 |
16.5 × 10⁻⁶ |
mm/m·°C |
|
20 – 200 |
17.5 × 10⁻⁶ |
mm/m·°C |
|
20 – 300 |
18.0 × 10⁻⁶ |
mm/m·°C |
|
20 – 400 |
18.5 × 10⁻⁶ |
mm/m·°C |
|
20 – 500 |
19.0 × 10⁻⁶ |
mm/m·°C |
|
20 – 600 |
19.5 × 10⁻⁶ |
mm/m·°C |
|
20 – 700 |
20.0 × 10⁻⁶ |
mm/m·°C |
Stainless Steel (SS) 321H Plate Standard Weights
Accurate knowledge of the standard weight of 321H stainless steel plates is crucial for estimating load calculations, freight costs, and structural design. Below is a helpful chart to determine the approximate weight based on thickness:
|
Thickness (mm) |
Weight (kg/m²) |
Weight (kg/ft²) |
|
1.0 |
7.93 |
0.736 |
|
2.0 |
15.86 |
1.473 |
|
3.0 |
23.79 |
2.209 |
|
4.0 |
31.72 |
2.945 |
|
5.0 |
39.65 |
3.681 |
|
6.0 |
47.58 |
4.417 |
|
8.0 |
63.44 |
5.890 |
|
10.0 |
79.30 |
7.363 |
|
12.0 |
95.16 |
8.836 |
|
16.0 |
126.88 |
11.781 |
|
20.0 |
158.60 |
14.726 |
|
25.0 |
198.25 |
18.408 |
Stainless Steel (SS) 321H Sheet Gauge Chart
The gauge size of a stainless steel sheet plays a critical role in determining its thickness, weight, and suitability for specific applications. Understanding the gauge-to-mm conversion for 321H stainless steel sheets helps engineers and procurement professionals make accurate decisions when specifying materials for fabrication or design.
|
Gauge (SWG) |
Thickness (mm) |
Thickness (inch) |
Approx. Weight (kg/m²) |
|
10 |
3.25 |
0.128 |
25.77 |
|
11 |
3.00 |
0.118 |
23.79 |
|
12 |
2.64 |
0.104 |
20.94 |
|
13 |
2.34 |
0.092 |
18.57 |
|
14 |
2.03 |
0.080 |
16.12 |
|
16 |
1.63 |
0.064 |
12.95 |
|
18 |
1.22 |
0.048 |
9.69 |
|
20 |
0.91 |
0.036 |
7.23 |
|
22 |
0.71 |
0.028 |
5.64 |
|
24 |
0.56 |
0.022 |
4.45 |
|
26 |
0.46 |
0.018 |
3.66 |
|
28 |
0.38 |
0.015 |
3.02 |
|
30 |
0.32 |
0.012 |
2.54 |
Applications of 321 Stainless Steel Sheet
321 stainless steel sheet is a versatile material that can be used in a multitude of applications. Due to its properties, it is a good choice when an application demands strength, resistance to oxidation, and high temperature performance.
The following are some applications of 321 stainless steel sheet:
- Aerospace
- Chemical processing
- Food and beverage
- Heat treating
- Power generation
CONTACT US TO GET A QUOTE FOR YOUR REQUIREMENTS
We deliver high-quality materials on time, ensuring reliable, cost-effective solutions that meet all industry standards.
FAQs
What is type 321 stainless steel?
Type 321 stainless steel is a titanium-stabilized austenitic stainless steel, offering corrosion resistance comparable to 304/304L stainless steel.
Is 321 SS better than 316 SST?
321 stainless steel and 316 stainless steel offer different advantages. 321 excels in high-temperature applications and maintains weld stability. 316 is the preferred choice for superior corrosion resistance, particularly in chemical and saltwater environments. The “better” option depends entirely on the specific application requirements.
What is the difference between 321 and 304 stainless steel?
321 stainless steel is preferred over 304 in industrial applications like chemical, coal, and petroleum industries that operate at high temperatures. 304 stainless steel is widely used in low-temperature applications like furniture decoration, food, and medical industries.
What grade is SS 321 equivalent to?
Stainless steel 321 is similar to grade 304 when annealed. However, it offers better corrosion resistance, especially after welding if it hasn’t been heat-treated, or when used in temperatures between 425 and 900°C
What is the difference between 321 and 321H stainless steel sheets?
The main difference between 321 and 321H stainless steel sheets boils down to strength and workability, especially at high temperatures. 1 Regular 321 is your workhorse – good for welding and general toughness, but not heat-treatable for extra strength. 321H, however, gets a heat treatment that boosts its strength when it’s hot and makes it easier to form. So, if your project involves high heat and needs a bit more oomph or shaping, 321H is likely the better bet. When you’re deciding, just weigh up what’s most important for your specific needs – temperature resistance, strength, corrosion protection, and how easy it is to work with.
Can SS 321 Plates Be Welded or Fabricated Easily?
Yes, Stainless Steel 321 plates offer excellent weldability and formability making them a preferred choice for applications involving high-temperature fabrication or continuous welding operations. The alloy’s titanium content stabilizes the material against chromium carbide precipitation during welding which helps prevent intergranular corrosion – a common issue in austenitic stainless steels.
Taiwan, Mexico, Iran, Namibia, Afghanistan, Netherlands, Nepal, Ireland, Libya, Morocco, Iran, Switzerland, Finland, Slovakia, Pakistan, Australia, Serbia, Angola, China, Philippines, Czech Republic, Belgium, Estonia, Costa Rica, Croatia, Sweden, Venezuela, Colombia, India, Belarus, Jordan, Azerbaijan, Mongolia, Vietnam, Ghana, Iraq, Algeria, Puerto Rico, New Zealand, Singapore, Indonesia, Ukraine, Israel, Mexico, Hong Kong, Bhutan, Germany, Brazil, Plan, Yemen, Malasiya, USA, Cambodia, Laos, Uganda, Tanzania, Sudan, Democratic Republic of Congo, zambia, Ethiopia, Brunei, Madagascar, Niger, Mali, Bangladesh, Bolivia, United States, Ecuador, Lebanon, Italy, South Korea, Denmark, Norway, Sri Lanka, Zimbabwe, Japan, Yemen, Oman, Portugal, Lithuania, Canada, Macau, Bahrain, Austria, Bulgaria, Spain, Kenya, United Kingdom, United Arab Emirates, Kazakhstan, Egypt, Saudi Arabia, Gambia, Argentina, Romania, Tibet, France, Chile, Gabon, South Africa, Trinidad & Tobago,Tunisia, Turkey, Nigeria, Peru, Russia, Chile, Nigeria, Hungary, Qatar, Greece, Malaysia, Kuwait, Poland, Thailand, Poland.
New York City, Los Angeles, Chicago, Houston, Phoenix, Philadelphia, San Antonio, San Diego, Dallas, San Jose, Austin, Jacksonville, Fort Worth, Columbus, Charlotte, San Francisco, Indianapolis, Seattle, Denver, Washington, Boston, El Paso, Nashville, Detroit, Oklahoma City, Portland, Las Vegas, Memphis, Louisville, Baltimore, Milwaukee, Albuquerque, Tucson, Fresno, Mesa, Sacramento, Atlanta, Kansas City, Colorado Springs, Omaha, Raleigh, Miami, Long Beach, Virginia Beach, Oakland, Minneapolis, Tulsa, Tampa, Arlington, New Orleans, Wichita, Bakersfield, Cleveland, Aurora, Anaheim, Honolulu, Santa Ana, Riverside, Corpus Christi, Lexington, Henderson, Stockton, Saint Paul, Cincinnati, St. Louis, Pittsburgh, Greensboro, Lincoln, Anchorage, Plano, Orlando, Irvine, Newark, Durham, Chula Vista, Toledo, Fort Wayne, St. Petersburg, Laredo, Jersey City, Chandler, Madison, Lubbock, Scottsdale, Reno, Buffalo, Gilbert, Glendale, North Las Vegas, Winston-Salem, Chesapeake, Norfolk, Fremont, Garland, Irving, Hialeah, Richmond, Boise, Spokane, Baton Rouge, Tacoma, San Bernardino, Modesto, Fontana, Des Moines, Moreno Valley, Santa Clarita, Fayetteville, Birmingham, Oxnard, Rochester, Port St. Lucie, Grand Rapids, Huntsville, Salt Lake City, Frisco, Yonkers, Amarillo, Glendale, Huntington Beach, McKinney, Montgomery, Augusta, Aurora, Akron, Little Rock, Tempe, Columbus, Overland Park, Grand Prairie, Tallahassee, Cape Coral, Mobile, Knoxville, Shreveport, Worcester, Ontario, Vancouver, Sioux Falls, Chattanooga, Brownsville, Fort Lauderdale, Providence, Newport News, Rancho Cucamonga, Santa Rosa, Peoria, Oceanside, Elk Grove, Salem, Pembroke Pines, Eugene, Garden Grove, Cary.
Our Products
Our Latest Blogs
Complete Guide to 304 Stainless Steel Tubes (304 SS Tubes)
Introduction to 304 Stainless Steel Tubes Industrial piping and construction is an industry that...
Hastelloy C276 Round Bars: Complete Guide
Hastelloy C276 is a superalloy that is known to be very versatile and possess remarkable high...
SAE 8620 Alloy Steel: Chemical Composition, Heat Treatment & Applications
SAE AISI 8620 steel is a widely used alloy that is prized for its combination of strength,...
Related Products
- Stainless Steel 304 Single Slotted Pipe
- Stainless Steel 304 Double Slotted Pipe
- Stainless steel 304 fittings
- Stainless Steel 304 Components
- Stainless Steel 309 Rod/Bar
- Stainless Steel 309 Hex Bar
- Stainless Steel 309 Square Bar
- Stainless Steel 309 Welded Pipes
- Stainless Steel 309 Plates Sheet
- Stainless steel 309 fittings
- Stainless Steel 309 Components
- Stainless Steel 310 Rod / Bar
- Stainless steel 310 Hex Bars
- Stainless Steel 310 Square Bar
- Stainless Steel 310 Welded Pipes
- Stainless Steel 310 Plates/Sheet
- Stainless Steel 310 Seamless Pipes
- Stainless steel 310 Welded Tubes
- Stainless steel 310 fittings
- Stainless steel 310 channels
- Stainless steel 310 H Beam
- Stainless steel 310 I Beam
- Stainless steel 310 seamless tubes
- Stainless Steel 310 Components
- Stainless Steel 316 / 316Ti Flanges
- Stainless Steel 316 / 316Ti Rod
- Stainless Steel 316 / 316Ti Hex Bars
- Stainless Steel 316 / 316Ti Square Bars
- Stainless Steel 316 / 316Ti Seamless Pipes
- Stainless Steel 316 / 316Ti Welded Pipes
- Stainless Steel 316 / 316Ti Plates
- Stainless Steel 316 / 316Ti Welded Tubes
- Stainless Steel 316 / 316Ti Seamless Tubes
- Stainless Steel 316 / 316Ti Flat Bars
- Stainless Steel 316 / 316Ti Angles
- Stainless Steel 316 / 316Ti Channels
- Stainless Steel 316 / 316Ti H Beams
- Stainless Steel 316 / 316Ti I Beam
- Stainless Steel 316 / 316Ti Pipe Fittings
- Stainless Steel 316 Single Slotted Pipe
- Stainless Steel 316 Double Slotted Pipe
- Stainless Steel 316/316Ti Components
- Stainless Steel 317L Flanges
- Stainless Steel 317L Rod/Bar
- Stainless Steel 317L Hex Bar
- Stainless steel 317L Square Bar
- Stainless Steel 317L Plates/Sheet
- Stainless steel 317L channels
- Stainless steel 317L H Beam
- Stainless steel 317L I Beam
- Stainless steel 317L fittings
- Stainless Steel 317L Components
- Stainless Steel 321 / 347 Flanges
- Stainless Steel 321/347 Rod/Bar
- Stainless Steel 321/347 Hex Bar
- Stainless Steel 321/347 Square Bar
- Stainless Steel 321/347 Seamless Pipes
- Stainless Steel 321/347 Welded Pipes
- Stainless Steel 321 / 347 Pipe Fittings
- Stainless Steel 321/347 Plates/Sheet
- Stainless steel 321 / 347 Welded Tubes
- Stainless steel 321 / 347 seamless tubes
- Stainless steel 321 / 347 channels
- Stainless steel 321 / 347 H Beam
- Stainless steel 321 / 347 I Beam
- Stainless Steel 321 / 347 Components
- Stainless Steel 409 / 409M / 409L / 410 / 430 / 430F / 431 / 439 / 441 Flange
- Stainless Steel 409/409M/409L/410/430/430F/431/439/441 Rod/Bars
- Stainless Steel 409/409M/409L/410/430/430F/431/439/441 Hex Bar
- Stainless Steel 409 / 409M / 409L / 410 / 430 / 430F / 431 / 439 / 441 Square Bar
- Stainless Steel 409 / 409M / 409L / 410 / 430 / 430F / 431 / 439 / 441 Welded Pipes
- Stainless Steel 409 / 409M / 409L / 410 / 430 / 430F / 431 / 439 / 441 Sheet /Plates/Coil
- Stainless Steel 409/409M/409L/410/430/430F/431/439/441 Welded tubes
- Stainless Steel 409/409M/409L/410/430/430F/431/439/441 Channel
- Stainless Steel 409/409M/409L/410/430/430F/431/439/441 H Beam
- Stainless Steel 409 / 409M / 409L / 410 / 430 / 430F / 431 / 439 / 441 I Beam
- Stainless Steel 409 / 409M / 409L / 410 / 430 / 430F / 431 / 439 / 441 Components
- Stainless Steel 420/ 420B & 420C Rod/Bar
- Stainless steel 420 / 420B & 420C hex bars
Send Us Message
Got a question? We'd love to hear from you. Send us a message & we'll respond as soon as possible.
