ASTM A312 Stainless Steel 321 Pipe Specification

ASTM A312 Stainless Steel 321 pipes are titanium-stabilised and resist corrosion and high temperatures. The following specifications cover standards, sizes, surface finishes, and delivery conditions for different industrial uses.

Parameter Details
Standard ASTM A312 / ASME SA 312 (Seamless & Welded) and ASTM A358 (Welded)
Size Range 1/8" NB to 24" NB (OD: 10.3 mm to 609.6 mm)
Wall Thickness 0.5 mm to 30 mm (depending on manufacturing process)
Schedule SCH 5, 10, 20, 40, 60, 80, 80S, 100, 120, 160, XXS
Length Single Random, Double Random, Cut Length (3 m to 6 m, custom available)
End Type Plain End (PE), Bevelled End (BE), Threaded
Surface Finish Annealed & Pickled (AP), Bright Annealed (BA), No.4 Finish
Delivery Condition Solution Annealed, Cold Drawn, Pickled, Bright Annealed
Form Round Pipe (Seamless, ERW, EFW, Welded)

Stainless Steel 321 Pipe Sizes and Dimensions

Stainless steel 321 piping comes in a range of sizes from 1/2" to 24" NPS, offered in schedules 5S, 10S, 40S, 80S, 160, and XXH. These specifications adhere to the ASME B36.19 standard.

Standard Pipe Size Chart (NPS, OD, Wall Thickness)

NPS OD (in) OD (mm) Sch 10S (mm) Sch 40S (mm) Sch 80S (mm)
1/2" 0.840 21.3 2.11 2.77 3.73
1" 1.315 33.4 2.77 3.38 4.55
2" 2.375 60.3 2.77 3.91 5.54
4" 4.500 114.3 3.05 6.02 8.56
6" 6.625 168.3 3.40 7.11 10.97
8" 8.625 219.1 3.76 8.18 12.70
12" 12.750 323.9 4.57 9.53 12.70

Schedule Options

SS 321 pipe schedules show how thick the pipe wall is for each size (NPS). Schedules 5S and 10S are used for low-pressure systems, 40S is common for general industrial use, and 80S to XXH are chosen for high-pressure applications.

Stainless Steel 321 Pipe Price

In India, SS 321 pipe usually costs ₹190–₹600 per kg. Internationally, prices are about $2.50–$5.00. The exact price depends on pipe size (NPS/OD), wall thickness, pipe type (seamless or welded), order quantity and current nickel prices.

Contact Sachiya Steel International for a current stainless steel 321 pipe price per kg.

Chemical Composition of ASTM A312 TP321 Pipe

The chemical composition of ASTM A312 TP321 pipe gives it good corrosion resistance and strength at high temperatures. Titanium helps stop carbide formation, improving durability, welding performance and reliability in tough conditions.

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 Pipe

The mechanical properties of Stainless Steel 321 pipe show how strong and flexible it is. These values confirm reliable performance in high-temperature and high-pressure service for both seamless and welded pipes.

515 / 75
MPa (min)
Tensile Strength
205 / 30
MPa (min)
Yield Strength
35%
(min)
Elongation
Property Value Unit
Tensile Strength (min) 515 / 75 MPa / ksi
Yield Strength (min) 205 / 30 MPa / ksi
Elongation (min) 35 %
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Stainless Steel 321 Pipe Equivalent Grades

This table shows the international names for Stainless Steel 321, a titanium-stabilised stainless steel. These equivalent grades allow engineers and purchasers to identify the same material, regardless of its origin or the standards it meets, when dealing with high-temperature applications.

Standard / Region Designation
USA UNS S32100
Germany / EU (EN/DIN) 1.4541 / X6CrNiTi18-10
Japan (JIS) SUS 321
China (GB) 06Cr18Ni11Ti (Old: 0Cr18Ni10Ti)
Russia (GOST) 08Kh18N10T

Stainless Steel 321 Pipe vs 304 and 316 Pipe

When deciding between grades 321, 304, and 316, several critical considerations come into play. These include the application's temperature, the corrosive nature of the environment, and, of course, the financial constraints.

Feature / Grade SS 321 SS 304 SS 316
Primary Stabilizer Titanium (Ti) None Molybdenum (Mo)
Best Temperature Range 427°C – 815°C Below 427°C Ambient to Moderate
Corrosion Specialty Intergranular (High Heat) General Purpose Chloride Pitting/Marine

Shipping & Packaging

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

We strictly follow seaworthy export handling standards to protect 321 pipe 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
  • Plastic end caps on threaded and plain-end pipes
  • Silica gel desiccants to minimize moisture exposure
  • ISPM-15 fumigated wooden packaging for export
shipping preparation Pipe Bundle Yard Staging
Shipping packaging Container End-Cap 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.

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Frequently Asked Questions:

What is the Price of SS 321 Pipe? +
SS 321 pipe price depends on size, thickness, type, quantity and nickel rates. Welded and seamless pipes are available around ₹190 to ₹600 per kg in India and internationally available around $2.50–$5.00.
What is 321 Stainless Steel Pipe Made of? +
321 stainless steel is made up of 17-19% chromium, 9-12% nickel, and titanium as a stabiliser, as specified in ASTM A312 / ASME SA-312 TP321.
Is 321 or 304 Stainless Steel Better for Pipe Applications? +
SS 321 is better above 427°C due to titanium stabilisation. For normal temperatures, 304 is usually sufficient and more cost-effective.
Can 321 Stainless Steel Pipe Be Welded? +
Yes. SS 321 welds easily. Titanium reduces carbide precipitation in the heat-affected zone, so post-weld annealing is usually unnecessary.
What Sizes are Available in SS 321 Pipe? +
SS 321 pipe is available from 1/2” to 24” NPS in schedules 5S, 10S, 40S, 80S, 160 and XXH, seamless and welded.
What is the Temperature Range for SS 321 Pipe? +
SS 321 pipe is ideal for 427-816°C service, where it resists intergranular corrosion that can affect unstabilised grades like 304.
What is the Difference Between SS 321 and 347 Pipe? +
Both are stabilised austenitic grades. 321 uses titanium; 347 uses niobium and offers slightly better high-temperature creep strength but usually costs more.
Where to Buy 321 Stainless Steel Pipe? +
Sachiya Steel International, located in Mumbai, India, supplies 321 stainless steel pipes. We provide ASTM A312 TP321 pipe, complete with mill test certificates and full traceability, in accordance with ASME SA-312 standards.

Get technical specs or custom stock for your 321 pipes. Request a Quote