Stainless Steel 321 Seamless Pipe Specifications
SS 321 seamless pipes covering standards, dimensions, and lengths are mentioned in the table listed below.
| Parameter | Details |
|---|---|
| Standard | ASTM A312 / ASME SA-312, ASME B36.10, ASTM A999 / ASME SA-999, ASTM A1016 / ASME SA-1016 |
| NPS Range | 1/2 inch to 12 inch |
| Outside Diameter | 21.3 mm to 323.8 mm |
| Schedules | 5S, 10S, 40S, 80S, 120, 160 |
| Length | 6 metres (20 feet); custom-cut available |
| Dimensional Standard | ASME B36.19 |
Stainless Steel 321 Seamless Pipe Sizes
Stainless Steel 321 pipes are available in the sizes, schedules and lengths mentioned in the table given below:
| Parameter | Details |
|---|---|
| Product | SS 321 Seamless Pipes |
| Size Range | 1/2 inch (12.7 mm) to 12 inch (323.8 mm) NPS |
| Schedules Available | 5S, 10S, 40S, 80S, up to 160 |
| Standard Length | 6 metres (20 feet) |
Stainless Steel 321 Seamless Pipe Weight Chart
Weight per metre for common NPS sizes across schedules 10S, 40S, and 80S is mentioned in the table below:
| NPS | OD (mm) | Sch 10S WT (mm) | kg/m | Sch 40S WT (mm) | kg/m | Sch 80S WT (mm) | kg/m |
|---|---|---|---|---|---|---|---|
| 1/2 inch | 21.3 | 2.11 | 1.00 | 2.77 | 1.27 | 3.73 | 1.62 |
| 1 inch | 33.4 | 2.77 | 2.09 | 3.38 | 2.50 | 4.55 | 3.24 |
| 2 inch | 60.3 | 2.77 | 3.93 | 3.91 | 5.44 | 5.54 | 7.48 |
| 4 inch | 114.3 | 3.05 | 8.36 | 6.02 | 16.07 | 8.56 | 22.32 |
| 6 inch | 168.3 | 3.40 | 13.84 | 7.11 | 28.26 | 10.97 | 42.56 |
| 8 inch | 219.1 | 3.76 | 19.96 | 8.18 | 42.55 | 12.70 | 64.64 |
| 12 inch | 323.8 | 4.57 | 35.97 | 10.31 | 79.73 | 12.70 | 97.43 |
Stainless Steel 321 Seamless Pipe Price
SS 321 seamless pipe prices in India range from approximately Rs. 380-450 per kg and $1,000 to $7,000 per metric ton internationally, depending on outside diameter, wall thickness, schedule, and order quantity. International pricing varies with nickel spot rates. Contact Sachiya Steel International for current rates.
Chemical Composition of Stainless Steel 321 Seamless Pipes
The chemical composition of SS 321 (UNS S32100), along with its proportion, is mentioned in the table below:
Mechanical Properties of Stainless Steel 321 Seamless Pipes
The mechanical properties of SS 321 seamless pipe, including tensile strength and elongation, are listed in the table below:
| Property | Value | Unit |
|---|---|---|
| Tensile Strength (min) | 515 (75) | MPa (ksi) |
| Yield Strength, 0.2% offset (min) | 205 (30) | MPa (ksi) |
| Elongation in 2 inch (min) | 35 | % |
Equivalent Grades of Stainless Steel 321 Seamless Pipes
International designation equivalent to SS 321 seamless pipes is listed in the table below:
| Standard / Country | Designation |
|---|---|
| UNS | S32100 |
| Germany / Europe (EN) | EN 1.4541 / X6CrNiTi18-10 |
| Japan (JIS) | SUS 321 |
| United Kingdom (BS) | 321S31 |
| Russia (GOST) | 08Kh18N10T |
| China (GB) | 06Cr18Ni11Ti |
| Sweden (SS) | SS 2337 |
| France (AFNOR) | Z6CNT18-10 |
Stainless Steel 321 Seamless Pipe Industrial Applications
321 stainless steel seamless pipes serve 4 major sectors where high-temperature corrosion resistance and creep strength are critical.
Oil and Gas Industry
SS 321 seamless pipes handle refinery piping and heat exchanger tubing in crude distillation units.
Chemical Processing
Used for reactor transfer lines and exhaust ducting in nitric acid production plants.
Power Generation
Used in boiler superheater piping in thermal power plants.
Aerospace and Exhaust Systems
Found in turbo manifolds and engine exhaust collectors.
Stainless Steel 321 vs 304 Seamless Pipes
The key difference between SS 321 Seamless Pipe and SS 304 Seamless Pipe is the presence of titanium. The table below explains it in detail.
| Parameter | SS 321 Seamless Pipe | SS 304 Seamless Pipe |
|---|---|---|
| Base Composition | Austenitic stainless steel with titanium stabilisation (modified 304) | Standard austenitic stainless steel (no stabilising elements) |
| Key Alloying Element | Titanium (Ti) added | No titanium or stabilising element |
| Sensitisation Resistance | Resistant to sensitisation in the 427-816 C range | Susceptible to sensitisation in the 427-816 C range |
| Intergranular Corrosion | Excellent resistance due to titanium stabilisation | Prone after prolonged high-temperature exposure |
| High-Temperature Performance | Suitable for continuous service above 425 C | Not recommended for prolonged high-temperature exposure |
| Thermal Cycling Resistance | Performs well under repeated thermal cycling | Lower resistance under cyclic heating conditions |
| Recommended Application | High-temperature piping, heat exchangers, thermal cycling environments | General-purpose piping under moderate temperature conditions |
Stainless Steel 321 vs SS 316 Seamless Pipes
The table below explains the difference between Stainless Steel 321 vs SS 316 Seamless Pipes in detail.
| Property / Criteria | Stainless Steel 316 (SS 316) | Stainless Steel 321 (SS 321) |
|---|---|---|
| Key Alloying Element | 2-3% Molybdenum | Titanium (Ti stabilised) |
| Primary Advantage | Excellent resistance to chloride pitting and crevice corrosion | Superior resistance to intergranular corrosion at high temperatures |
| Corrosion Resistance Focus | Marine and chloride-rich environments | High-temperature oxidation and sensitisation resistance |
| Temperature Suitability | Moderate to high temperatures | Continuous service above 425 C |
| Best Application Environments | Marine, coastal, chemical processing with chlorides | High-temperature piping, heat exchangers, thermal processing |
| Limitation | Reduced performance in prolonged high-temperature exposure | Lower resistance to chloride environments compared to 316 |
| Recommended Use Case | Use in chloride-rich or marine environments | Use in continuous high-temperature service (>425 C) |
Shipping & Packaging
Heavy-duty wooden boxes Packing
We strictly follow seaworthy export handling standards to protect SS 321 seamless 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
Pipe Bundle Yard Staging
Container End-Cap Protection
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
Canada
Germany
UK
Italy
France
Australia
South Korea
Indonesia
Vietnam
Singapore
Malaysia
Taiwan
UAE
Saudi Arabia
Qatar
Oman
South Africa
Nigeria
Egypt