What Sets Our Stainless Steel 321 Pipe Supply Apart
19+ Years Experience
Machining ASTM A312 TP321 pipe from Mumbai.
Titanium-Stabilized Grade
Every heat traceable with EN 10204 3.1 certificates.
Quick Ex-Stock Dispatch
Stock sizes dispatch within 24 to 48 hours.
Custom Machining
We cut sizes and lengths to your drawing. Finishes match your specification too.
SS 321 Pipe in Brief
Sizes Can Be Manufactured1/2″ to 24″ NB
Raw MaterialContinuous Cast Round Bar
UNS DesignationUNS S32100
Hardness90 HRB Max
321 Pipe Yield Strength205 MPa Min
Temperature ResistanceUp to 870°C
EnvironmentHigh-Heat and Post-Weld Service
Governing StandardASTM A312 / A213
Access SS 321 Seamless Pipe Supplier In India At Latest Price Per Kg
We stock and machine ASTM A312 TP321 pipe. This titanium stabilized grade carries UNS S32100 designation. It prevents chromium carbide precipitation during thermal service. It handles operating temperatures between 425C and 816C. The weld zone resists severe intergranular attack naturally. No post weld heat treatment cycle is required. This gives a clear advantage over 304 steel. We manufacture seamless welded ERW and EFW forms. Our Mumbai facility operates continuously since year 2007. We deliver fast dispatch for global export orders. Every single shipment includes EN 10204 3.1 certification.
Stainless Steel 321 Pipe Specification
Quick specs for grade and size range. We stock and machine these to order.
321 Stainless Steel U-Tube Grade / UNS
321 / S32100
ASTM A312 TP321 Seamless Pipe Standard
ASTM A312 / A213
AISI 321 Round Pipe OD Range
21.3 mm – 610 mm*
ASME SA312 TP321 Welded Pipe Wall Thickness
Sch 5S – 80S*
JIS SUS321 Capillary Tube Temper
Solution Annealed and Pickled
DIN 1.4541 Heat Exchanger Tube Alloying Elements
Cr–Ni, titanium-stabilized
SS 321 EFW Pipe Form
Seamless / Welded / ERW / EFW
UNS S32100 Square Pipe Test Certificate
EN 10204 3.1 / 3.2
SS 321 Seamless Boiler Tube Third-Party Inspection
SGS / BV / TUV on request
ASTM A312 TP321 Rectangular Pipe Ex-Stock Location
Mumbai warehouse
SS 321 Polished Pipe Ex-Stock Dispatch
24 – 48 hours
UNS S32100 Threaded Pipe Length Options
Random, Beveled, Threaded, Custom-cut
321 Stainless Steel Seamless Pipe Price Per Kg
Our rate per kg as a Stainless Steel 321 Pipe supplier in India depends on form, size and finish.
SS 321 Pipe Rate Guide
SS 321 Seamless PipeHighest rate. Cold drawn costs more than hot finished.
SS 321 Welded PipeLower than seamless for the same size.
SS 321 EFW PipeBest value for OD above 8 inch.
321H PipeSmall premium over 321 for controlled carbon.
SS 321 Heat Exchanger TubeTight tolerance and thin wall add to the rate.
SS 321 Polished PipePolishing is added to the base pipe rate.
| Product | Size / Condition | Indicative Rate (₹/kg) |
|---|---|---|
| SS 321 Seamless Pipe | 1/2″ – 4″ NB, Sch 10S – 80S | 380 – 450 |
| SS 321 Seamless Pipe | Above 4″ NB, below 1/2″, or Sch 160 / XXS | 430 – 520 |
| SS 321 Welded / ERW Pipe | 1/2″ – 8″ NB | 310 – 380 |
| SS 321 EFW Pipe | Above 8″ NB | 330 – 400 |
| 321H Pipe | Seamless, all sizes | Add ₹15 – 30 over 321 |
| SS 321 Heat Exchanger Tube | ASTM A213, 12.7 – 50.8 mm OD | 450 – 600 |
| SS 321 Polished Pipe | Any form | Add ₹20 – 40 over base rate |
Buy ASME SA312 TP321 Welded Pipe In Sizes From 1/2 Inch To 24 Inch
Our Mumbai facility stocks and exports ASTM A312 TP321 UNS S32100 pipes with EN 10204 3.1 certification.
NB Size Range
1/2″ – 24″
OD Range
21.3 mm – 610 mm
Wall Thickness
Sch 5S – 80S
Available Forms
Seamless and Welded
Get Latest Stainless Steel 321 Pipe Rates and UNS S32100 Price List
Request the current per kg rate for 321 pipe. Compare it before you finalise your order.
ASME SA312 TP321 Threaded Pipe Dimension Table
Wall thickness in inches for 1/8″ to 24″ NPS. The 5S, 10S, 40S and 80S walls follow ASME B36.19M, the standard for stainless steel pipe. Sch 40, Sch 80, Sch 160 and XXS follow ASME B36.10M. Use this 321 stainless steel pipe dimension chart to match the schedule on your drawing.
| NPS (in) | Outside Diameter | Wall Thickness (in) | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| in | mm | 5S | 10S | 40S | Sch 40 | 80S | Sch 80 | Sch 160 | XXS | |
| 1/8 | .405 | 10.3 | – | .049 | .068 | .068 | .095 | .095 | – | – |
| 1/4 | .540 | 13.7 | – | .065 | .088 | .088 | .119 | .119 | – | – |
| 3/8 | .675 | 17.1 | – | .065 | .091 | .091 | .126 | .126 | – | – |
| 1/2 | .840 | 21.3 | .065 | .083 | .109 | .109 | .147 | .147 | .188 | .294 |
| 3/4 | 1.050 | 26.7 | .065 | .083 | .113 | .113 | .154 | .154 | .219 | .308 |
| 1 | 1.315 | 33.4 | .065 | .109 | .133 | .133 | .179 | .179 | .250 | .358 |
| 1-1/4 | 1.660 | 42.2 | .065 | .109 | .140 | .140 | .191 | .191 | .250 | .382 |
| 1-1/2 | 1.900 | 48.3 | .065 | .109 | .145 | .145 | .200 | .200 | .281 | .400 |
| 2 | 2.375 | 60.3 | .065 | .109 | .154 | .154 | .218 | .218 | .344 | .436 |
| 2-1/2 | 2.875 | 73.0 | .083 | .120 | .203 | .203 | .276 | .276 | .375 | .552 |
| 3 | 3.500 | 88.9 | .083 | .120 | .216 | .216 | .300 | .300 | .438 | .600 |
| 3-1/2 | 4.000 | 101.6 | .083 | .120 | .226 | .226 | .318 | .318 | – | – |
| 4 | 4.500 | 114.3 | .083 | .120 | .237 | .237 | .337 | .337 | .531 | .674 |
| 5 | 5.563 | 141.3 | .109 | .134 | .258 | .258 | .375 | .375 | .625 | .750 |
| 6 | 6.625 | 168.3 | .109 | .134 | .280 | .280 | .432 | .432 | .719 | .864 |
| 8 | 8.625 | 219.1 | .109 | .148 | .322 | .322 | .500 | .500 | .906 | .875 |
| 10 | 10.750 | 273.1 | .134 | .165 | .365 | .365 | .500 | .594 | 1.125 | 1.000 |
| 12 | 12.750 | 323.9 | .156 | .180 | .375 | .406 | .500 | .688 | 1.312 | 1.000 |
| 14 | 14.000 | 355.6 | .156 | .188 | .375 | .438 | .500 | .750 | 1.406 | – |
| 16 | 16.000 | 406.4 | .165 | .188 | .375 | .500 | .500 | .844 | 1.594 | – |
| 18 | 18.000 | 457.0 | .165 | .188 | .375 | .562 | .500 | .938 | 1.781 | – |
| 20 | 20.000 | 508.0 | .188 | .218 | .375 | .594 | .500 | 1.031 | 1.969 | – |
| 22 | 22.000 | 559.0 | .188 | .218 | .375 | – | .500 | 1.125 | 2.125 | – |
| 24 | 24.000 | 610.0 | .218 | .250 | .375 | .688 | .500 | 1.219 | 2.344 | – |
ASTM A312 TP321 Pipe Types
Being a Stainless Steel 321 Pipe stockist in India, we hold every 321 pipe and tube form below.
ASTM A213 TP321 Tube
- Precision boiler tube spec
- Ideal for heat exchangers
- Tight OD and wall tolerance
UNS S32100 Pipe
- Universal alloy designation
- Matches ASTM / ASME grades
- Full traceability certified
SS 321 Seamless Pipe
- No weld seam for strength
- Higher pressure rating
- Suited to high-heat lines
SS 321 Welded Pipe
- Cost-effective alternative
- Consistent wall thickness
- Available in large diameters
Stainless Steel 321 ERW Pipe
- Electric resistance welded
- Economical for large diameters
- Fast production turnaround
321 Stainless Steel Round Pipe
- Standard round profile
- Wide size range
- General fabrication use
Request a Stainless Steel 321 Pipe Quote From Our Mumbai Team
Share your drawing with us. We send back pricing on the same working day.
SS 321 Welded Pipe Compared With SS 304 Pipe
See what titanium changes in 321 pipe. Compare it against standard 304 pipe.
321
Best for welded, high-heat service
- StabilizerTi, min 5×(C+N)
- Yield Strength205 MPa min
- Post-Weld SensitizationResists to 816°C
- Typical PriceHigher than 304
VS
304
Good for general-purpose service
- StabilizerNone
- Yield Strength205 MPa min
- Post-Weld SensitizationRisk without PWHT
- Typical PriceBaseline (lower)
Mumbai Based Stainless Steel 321 Pipe Manufacturer, Serving Since 2007
Order TP321 titanium stabilized pipe cut to your length. It is packed and ready to ship.
AISI 321 / 321H Pipe Chemical Composition
See the exact 321 stainless steel composition, verified against ASTM A312 and A213 Table 1. This is the complete 321 stainless steel pipe chemical composition chart.
| Element (wt %) | 321 (UNS S32100) | 321H (UNS S32109) |
|---|---|---|
| Carbon (C) | 0.08 max | 0.04 – 0.10 |
| Manganese (Mn) | 2.00 max | 2.00 max |
| Silicon (Si) | 1.00 max | 1.00 max |
| Phosphorus (P) | 0.045 max | 0.045 max |
| Sulfur (S) | 0.030 max | 0.030 max |
| Chromium (Cr) | 17.0 – 19.0 | 17.0 – 19.0 |
| Nickel (Ni) | 9.0 – 12.0 | 9.0 – 12.0 |
| Nitrogen (N) | 0.10 max | – |
| Titanium (Ti) | 5×(C+N) min, 0.70 max | 4*(C+N) min, 0.70 max |
UNS S32100 Seamless Pipe Equivalent Grades
Every 321 stainless steel equivalent designation, from UNS to DIN, JIS and EN. Find the exact 321 stainless steel pipe equivalent for your project standard.
UNS
S32100
Werkstoff Nr. (DIN)
1.4541
JIS
SUS 321
EN
X6CrNiTi18-10
AISI
321
ASTM / ASME
TP321 / SA312
ASTM A312 TP321 Hydraulic Pipe Mechanical Properties
These are minimum values for 321 pipe. ASTM A312 and A213 require them.
515MPa min
Tensile Strength
205MPa min
Yield Strength
35% min
Elongation
90HRB max
Hardness (Rockwell B)
Where Buyers in South Africa, UAE, Kenya and Canada Use 321 Stainless Steel Heat Exchanger Tube
Four markets where titanium stabilized 321 is picked for high heat service.
South Africa
321 Pipe for South Africa Refineries
Resists weld zone corrosion in heat cycles.
UAE and Gulf
TP321 Pipe for UAE Desalination and Exhaust Lines
Handles hot exhaust and steam duty.
Kenya
SA312 TP321 Pipe for Kenya Geothermal Plants
Suits nonstop high heat steam lines.
Canada
321 Boiler Tube Supply for Canada Plants
Holds creep strength in oil sands steam.
Applications of ASME SA312 TP321 Boiler Tube
As a Stainless Steel 321 Pipe supplier in Mumbai, we serve these high heat, welded applications.
JIS SUS321 Round Pipe Weight Chart
Weight per metre of 321 stainless steel pipe from 1/8″ to 24″ NPS, for every common stainless schedule. Wall thicknesses follow ASME B36.19M and B36.10M.
W (kg/m) = (OD – WT) * WT * 0.02491
| NPS | OD (mm) | 5S | 10S | 40S | 80S | Sch 160 | XXS | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| WT mm | kg/m | WT mm | kg/m | WT mm | kg/m | WT mm | kg/m | WT mm | kg/m | WT mm | kg/m | ||
| 1/8″ | 10.3 | – | – | 1.24 | 0.28 | 1.73 | 0.37 | 2.41 | 0.47 | – | – | – | – |
| 1/4″ | 13.7 | – | – | 1.65 | 0.50 | 2.24 | 0.64 | 3.02 | 0.80 | – | – | – | – |
| 3/8″ | 17.1 | – | – | 1.65 | 0.64 | 2.31 | 0.85 | 3.20 | 1.11 | – | – | – | – |
| 1/2″ | 21.3 | 1.65 | 0.81 | 2.11 | 1.01 | 2.77 | 1.28 | 3.73 | 1.63 | 4.78 | 1.97 | 7.47 | 2.57 |
| 3/4″ | 26.7 | 1.65 | 1.03 | 2.11 | 1.29 | 2.87 | 1.70 | 3.91 | 2.22 | 5.56 | 2.93 | 7.82 | 3.68 |
| 1″ | 33.4 | 1.65 | 1.30 | 2.77 | 2.11 | 3.38 | 2.53 | 4.55 | 3.27 | 6.35 | 4.28 | 9.09 | 5.50 |
| 1-1/4″ | 42.2 | 1.65 | 1.67 | 2.77 | 2.72 | 3.56 | 3.43 | 4.85 | 4.51 | 6.35 | 5.67 | 9.70 | 7.85 |
| 1-1/2″ | 48.3 | 1.65 | 1.92 | 2.77 | 3.14 | 3.68 | 4.09 | 5.08 | 5.47 | 7.14 | 7.32 | 10.15 | 9.65 |
| 2″ | 60.3 | 1.65 | 2.41 | 2.77 | 3.97 | 3.91 | 5.49 | 5.54 | 7.56 | 8.74 | 11.23 | 11.07 | 13.58 |
| 2-1/2″ | 73.0 | 2.11 | 3.73 | 3.05 | 5.31 | 5.16 | 8.72 | 7.01 | 11.52 | 9.53 | 15.07 | 14.02 | 20.60 |
| 3″ | 88.9 | 2.11 | 4.56 | 3.05 | 6.52 | 5.49 | 11.41 | 7.62 | 15.43 | 11.13 | 21.56 | 15.24 | 27.96 |
| 3-1/2″ | 101.6 | 2.11 | 5.23 | 3.05 | 7.49 | 5.74 | 13.71 | 8.08 | 18.82 | – | – | – | – |
| 4″ | 114.3 | 2.11 | 5.90 | 3.05 | 8.45 | 6.02 | 16.24 | 8.56 | 22.55 | 13.49 | 33.88 | 17.12 | 41.44 |
| 5″ | 141.3 | 2.77 | 9.56 | 3.40 | 11.68 | 6.55 | 21.99 | 9.53 | 31.28 | 15.88 | 49.61 | 19.05 | 58.01 |
| 6″ | 168.3 | 2.77 | 11.42 | 3.40 | 13.97 | 7.11 | 28.55 | 10.97 | 42.99 | 18.26 | 68.25 | 21.95 | 80.02 |
| 8″ | 219.1 | 2.77 | 14.93 | 3.76 | 20.17 | 8.18 | 42.98 | 12.70 | 65.30 | 23.01 | 112.39 | 22.23 | 109.02 |
| 10″ | 273.1 | 3.40 | 22.84 | 4.19 | 28.07 | 9.27 | 60.92 | 12.70 | 82.38 | 28.58 | 174.08 | 25.40 | 156.72 |
| 12″ | 323.9 | 3.96 | 31.56 | 4.57 | 36.35 | 9.53 | 74.63 | 12.70 | 98.45 | 33.32 | 241.18 | 25.40 | 188.87 |
| 14″ | 355.6 | 3.96 | 34.69 | 4.78 | 41.77 | 9.53 | 82.15 | 12.70 | 108.48 | 35.71 | 284.55 | – | – |
| 16″ | 406.4 | 4.19 | 41.98 | 4.78 | 47.82 | 9.53 | 94.21 | 12.70 | 124.55 | 40.49 | 369.06 | – | – |
| 18″ | 457.0 | 4.19 | 47.26 | 4.78 | 53.85 | 9.53 | 106.23 | 12.70 | 140.56 | 45.24 | 464.02 | – | – |
| 20″ | 508.0 | 4.78 | 59.92 | 5.54 | 69.34 | 9.53 | 118.33 | 12.70 | 156.69 | 50.01 | 570.54 | – | – |
| 22″ | 559.0 | 4.78 | 65.99 | 5.54 | 76.38 | 9.53 | 130.44 | 12.70 | 172.83 | 53.98 | 679.07 | – | – |
| 24″ | 610.0 | 5.54 | 83.42 | 6.35 | 95.48 | 9.53 | 142.55 | 12.70 | 188.96 | 59.54 | 816.41 | – | – |
321 Stainless Steel Pipe Pressure Rating
Maximum allowable working pressure for seamless ASTM A312 TP321 pipe at up to 38°C (100°F). Each cell shows bar / psi.
| NPS | OD (in) | 10S | 40S | 80S | Sch 160 |
|---|---|---|---|---|---|
| 1/4″ | .540 | 317 / 4,600 | 444 / 6,440 | 629 / 9,120 | – |
| 3/8″ | .675 | 249 / 3,610 | 359 / 5,210 | 518 / 7,520 | – |
| 1/2″ | .840 | 256 / 3,720 | 344 / 5,000 | 481 / 6,980 | 640 / 9,290 |
| 3/4″ | 1.050 | 202 / 2,930 | 281 / 4,070 | 394 / 5,720 | 589 / 8,550 |
| 1″ | 1.315 | 212 / 3,080 | 263 / 3,810 | 363 / 5,270 | 529 / 7,680 |
| 1-1/4″ | 1.660 | 166 / 2,410 | 216 / 3,140 | 302 / 4,380 | 406 / 5,890 |
| 1-1/2″ | 1.900 | 144 / 2,090 | 195 / 2,820 | 274 / 3,980 | 398 / 5,770 |
| 2″ | 2.375 | 114 / 1,660 | 164 / 2,380 | 237 / 3,430 | 389 / 5,640 |
| 2-1/2″ | 2.875 | 104 / 1,500 | 179 / 2,600 | 248 / 3,600 | 346 / 5,020 |
| 3″ | 3.500 | 85 / 1,230 | 156 / 2,260 | 220 / 3,190 | 331 / 4,800 |
| 3-1/2″ | 4.000 | 74 / 1,070 | 142 / 2,060 | 203 / 2,950 | – |
| 4″ | 4.500 | 66 / 950 | 132 / 1,910 | 191 / 2,770 | 310 / 4,500 |
| 5″ | 5.563 | 59 / 860 | 116 / 1,680 | 171 / 2,480 | 294 / 4,270 |
| 6″ | 6.625 | 50 / 720 | 105 / 1,520 | 165 / 2,390 | 283 / 4,110 |
| 8″ | 8.625 | 42 / 610 | 93 / 1,340 | 146 / 2,110 | 274 / 3,970 |
| 10″ | 10.750 | 37 / 540 | 84 / 1,220 | 116 / 1,680 | 273 / 3,950 |
| 12″ | 12.750 | 34 / 500 | 72 / 1,050 | 97 / 1,410 | 268 / 3,880 |
| 14″ | 14.000 | 33 / 470 | 66 / 960 | 88 / 1,280 | 261 / 3,780 |
| 16″ | 16.000 | 29 / 410 | 58 / 830 | 77 / 1,120 | 258 / 3,750 |
| 18″ | 18.000 | 25 / 370 | 51 / 740 | 68 / 990 | 257 / 3,720 |
| 20″ | 20.000 | 27 / 380 | 46 / 660 | 61 / 890 | 255 / 3,700 |
| 22″ | 22.000 | 24 / 350 | 42 / 600 | 56 / 810 | 250 / 3,630 |
| 24″ | 24.000 | 25 / 370 | 38 / 550 | 51 / 740 | 253 / 3,670 |
India Based SS 321 Seamless Pipe Exporter Shipping to Durban and Mombasa
Every export lot ships with mill test certificates. Your customs clearance stays quick and simple.
Where We Supply 321 Stainless Steel Pipe
These are regular export lanes to your markets. We check size and stock before dispatch.
UAE
321 Stainless Steel Pipe Supplier
Canada
321 Stainless Steel Pipe Supplier
Kenya
321 Stainless Steel Pipe Supplier
South Africa
321 Stainless Steel Pipe Supplier
Stocking Distributor of JIS SUS321 Polished Pipe
Every length we keep as a Stainless Steel 321 Pipe stockist in Mumbai comes from these certified mills.
Trusted Global Mills We Source From
DIN 1.4541 Square Pipe Delivery Estimate
Plan your 321 order around our dispatch and transit times as a Stainless Steel 321 Pipe exporter in India.
- Leaves our Mumbai warehouse
- Packed within 24-48 hours
- Covers regularly stocked sizes
- Suits Gulf, African and Asian ports
- Transit runs 12-18 days
- Best rate for bulk tonnage
- Reserved for time-critical orders
- Reaches you in 3-5 days
- Handled on a priority line
- Set by your destination port
- Shifts with local customs load
- Locked in once you place the order
PED Approved ASTM A312 TP321 Pipe Supplier Serving Ahmedabad
We test and certify each pipe batch. Nothing leaves our plant without it.
SS 321 Seamless Instrumentation Tube Certification and Testing
Each order is tested and certified by us, a Stainless Steel 321 Pipe manufacturer in India.
Mill Test Certificate
EN 10204 3.1 standard, 3.2 on request
Third-Party Inspection
Available on request
Registration Data
Canada CRN-ready documentation
Regional Conformity
GCC / SASO documentation on request
Global Reach
DIN 1.4541 ERW Pipe Supply Across Asia, Africa and Beyond
We hold ex stock and mill order inventory. We dispatch to our core export markets.
UAE
Turkey
Uganda
Germany
Italy
Netherlands
United States
Canada
Mexico
Venezuela
Thailand
Philippines
Malaysia
Indonesia
Vietnam
Ahmedabad
Bengaluru
Chennai
Pune
Ghaziabad
Gujarat
Delhi
Rajkot
Kolkata
Nagpur
ASTM A312 TP321 EFW Pipe FAQs
These are common questions buyers ask us. They ask before placing a 321 order.
What is 321 Stainless Steel Seamless Pipe used for?
- Refinery, boiler and superheater tubing
- Aircraft and automotive exhaust systems
- Heat exchangers and geothermal steam lines
What is the difference between SS 321 Welded Pipe and 304 stainless steel pipe?
- 321 carries titanium, min 5*(C+N)
- Resists sensitization to 816°C
- No post-weld heat treatment needed
What is the price of ASTM A312 TP321 ERW Pipe per kg?
- Depends on size, thickness and form
- Order quantity affects final rate
- Share specs for an instant quote
Do you provide mill test certificates with every UNS S32100 Instrumentation Tube order?
- EN 10204 3.1 on every order
- 3.2 certification on request
- SGS / BV / TUV inspection available
What is your dispatch and delivery timeline for DIN 1.4541 Round Pipe?
- Ex-stock: 24-48 hours
- Sea freight: 12-18 days
- Air freight: 3-5 days
Do you supply AISI 321H Pipe for higher-temperature service?
- 321H carries 0.04-0.10% carbon
- Specified above 538°C continuous duty
- Machined to your drawing on request
