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Girgaon, Mumbai - 400004
Stainless Steel 321 Seamless Tubes Manufacturer in India
What Are Stainless Steel 321 Seamless Tubes?
Stainless Steel 321 Seamless Tubes are titanium-stabilized austenitic stainless steel tubes produced without a longitudinal weld for applications involving elevated temperatures, thermal cycling and corrosive service conditions. Grade 321 is designated as UNS S32100 and contains titanium as a stabilizing element, helping the material retain its corrosion resistance after exposure to elevated temperatures.
Unlike conventional unstabilized austenitic stainless steels, Stainless Steel 321 is designed to reduce the risk of chromium carbide precipitation during heating. This makes the grade particularly useful where tubes experience repeated heating and cooling or prolonged exposure to elevated temperatures. It also provides good oxidation resistance, toughness and general corrosion resistance for industrial service.
Stainless Steel 321 Seamless Tubes are available according to relevant ASTM and ASME specifications, depending on the intended application and product requirements. Common specifications include ASTM A213 and ASTM A269, with applicable ASME SA specifications available for projects requiring ASME compliance. Sizes, wall thicknesses, schedules, finishes and lengths can be selected according to individual requirements.
These tubes are widely used in heat exchangers, refinery equipment, chemical processing systems, power-generation plants, furnace components, petrochemical equipment, aerospace systems and high-temperature process applications. The titanium-stabilized composition makes Stainless Steel 321 suitable for service where resistance to sensitization and reliable performance during thermal exposure are important.
Kamal Steels is a Manufacturer and Stockist of Stainless Steel 321 Seamless Tubes, providing tubes in standard as well as customized dimensions. We support domestic and international requirements with MTC, inspection documentation, testing reports and export-standard packaging based on project needs.
Table of Contents
- Stainless Steel 321 Seamless Tube Specifications
- Stainless Steel 321 Seamless Tube Size Chart
- Stainless Steel 321 Seamless Tube Standards
- Stainless Steel 321 Seamless Tube Features
- Stainless Steel 321 Chemical Composition
- Stainless Steel 321 Mechanical Properties
- Stainless Steel 321 Seamless Tube Applications
- Industries Using Stainless Steel 321 Seamless Tubes
- Frequently Asked Questions
Stainless Steel 321 Seamless Tube Specifications
Stainless Steel 321 Seamless Tubes can be supplied in various dimensions, finishes and material conditions to satisfy applicable specifications and operating requirements.
| Specification | Stainless Steel 321 Seamless Tubes |
|---|---|
| Material | Stainless Steel |
| Grade | 321 |
| UNS | S32100 |
| Tube Type | Seamless |
| ASTM Standards | ASTM A213, ASTM A269 |
| ASME Standards | ASME SA213, Applicable ASME SA Specifications |
| Outside Diameter | As per requirement |
| Wall Thickness | As per requirement |
| Schedule | As required |
| Length | Random, Fixed or Customized |
| Finish | Annealed, Pickled, Bright Annealed, Polished or As required |
| Form | Round Tube |
Stainless Steel 321 Seamless Tube Size Chart
Stainless Steel 321 Seamless Tubes are manufactured and supplied in a range of outside diameters and wall thicknesses. Customized dimensions can also be considered according to application and project specifications.
| Tube Size | Outside Diameter (mm) | Wall Thickness | Length |
|---|---|---|---|
| 1/2" | 12.70 | As required | As required |
| 3/4" | 19.05 | As required | As required |
| 1" | 25.40 | As required | As required |
| 1-1/2" | 38.10 | As required | As required |
| 2" | 50.80 | As required | As required |
| 3" | 76.20 | As required | As required |
| 4" | 101.60 | As required | As required |
| 6" | 152.40 | As required | As required |
| 8" | 203.20 | As required | As required |
Stainless Steel 321 Seamless Tube Standards
The required standard is selected based on tube application, dimensions, manufacturing method and service conditions. Common specifications include:
| Standard | Application / Product Requirement |
|---|---|
| ASTM A213 | Seamless ferritic and austenitic alloy-steel boiler, superheater and heat-exchanger tubes |
| ASTM A269 | Seamless and welded austenitic stainless steel tubing for general corrosion-resisting service |
| ASME SA213 | Applicable seamless ferritic and austenitic alloy-steel tubing requirements |
| ASME SA269 | Applicable austenitic stainless steel tubing requirements for general service |
Stainless Steel 321 Seamless Tube Features
Stainless Steel 321 combines titanium stabilization with the properties of an austenitic stainless steel, making it suitable for equipment exposed to heat, thermal cycling and corrosive industrial environments.
- Titanium-stabilized austenitic stainless steel
- Good resistance to intergranular corrosion after heating
- Good performance during thermal cycling
- Good oxidation resistance at elevated temperatures
- Good general corrosion resistance
- Excellent resistance to sensitization
- Good toughness at elevated temperatures
- Good weldability and fabrication characteristics
- Suitable for prolonged high-temperature service
- Available in various sizes, wall thicknesses and finishes
Stainless Steel 321 Chemical Composition
The composition of Stainless Steel 321 includes chromium and nickel along with titanium stabilization. Titanium helps maintain the alloy's resistance to intergranular corrosion following exposure to elevated temperatures.
| Element | Composition (%) |
|---|---|
| Chromium | 17.0 - 19.0 |
| Nickel | 9.0 - 12.0 |
| Titanium | 5 × C min. to 0.70 max. |
| Carbon | 0.08 max. |
| Manganese | 2.00 max. |
| Silicon | 0.75 max. |
| Phosphorus | 0.045 max. |
| Sulfur | 0.030 max. |
| Iron | Balance |
Stainless Steel 321 Mechanical Properties
Stainless Steel 321 provides a useful balance of strength, ductility and corrosion resistance for industrial tubing applications. Typical minimum mechanical requirements include:
| Property | Minimum Requirement |
|---|---|
| Tensile Strength | 515 MPa min. |
| Yield Strength | 205 MPa min. |
| Elongation | 40% min. |
| Density | Approx. 8.0 g/cm³ |
Note: Final mechanical values should be confirmed against the applicable material specification, dimensions and supplied material test certificate.
Stainless Steel 321 Seamless Tube Applications
Stainless Steel 321 Seamless Tubes are selected for equipment where resistance to heat, thermal cycling and intergranular corrosion is important to long-term service performance.
Power Generation
Used in selected high-temperature tubular equipment and process systems in power-generation facilities.
Heat Exchangers
Suitable for heat-transfer equipment operating under elevated-temperature conditions.
Refinery Equipment
Used in refinery process equipment where thermal stability and corrosion resistance are required.
Chemical Processing
Used in process equipment exposed to corrosive media and temperature variations.
Furnace Components
Used in selected tubular components exposed to repeated heating and elevated temperatures.
Petrochemical Systems
Used in high-temperature process and fluid-handling equipment.
Industries Using Stainless Steel 321 Seamless Tubes
The grade is used across industrial sectors that require titanium-stabilized stainless steel tubing for elevated-temperature and corrosive service.
Power Industry
Used in thermal equipment and selected high-temperature process systems.
Refinery Industry
Applied in process equipment exposed to heat and corrosive operating conditions.
Chemical Industry
Used for tubular systems requiring corrosion resistance and thermal stability.
Petrochemical Industry
Used in high-temperature process and fluid-handling applications.
Aerospace Industry
Used in selected components requiring heat-resistant stainless steel materials.
Engineering Industry
Used in specialized equipment exposed to elevated temperatures and thermal cycling.
Frequently Asked Questions
Stainless Steel 321 Seamless Tubes are titanium-stabilized austenitic stainless steel tubes manufactured from Stainless Steel 321 (UNS S32100 / WNR 1.4541). They provide excellent corrosion resistance, outstanding oxidation resistance, and superior high-temperature performance.
Our Stainless Steel 321 Seamless Tubes are manufactured according to ASTM A213, ASTM A269, ASME SA213, and ASME SA269 international standards.
SS 321 Seamless Tubes offer excellent resistance to oxidation, scaling, intergranular corrosion, thermal fatigue, and elevated temperatures while maintaining excellent weldability and mechanical strength.
They are widely used in boilers, heat exchangers, petrochemical plants, refineries, aerospace components, exhaust systems, chemical processing industries, and power generation facilities.
SS 321 Seamless Tubes are available in various outside diameters, wall thicknesses, schedules, surface finishes, and custom cut lengths to meet diverse industrial requirements.
Each tube undergoes Hydrostatic Testing, Ultrasonic Testing (UT), Eddy Current Testing (ECT), Positive Material Identification (PMI), Chemical Analysis, Mechanical Testing, Flattening Test, Flaring Test, Intergranular Corrosion (IGC) Testing, and Dimensional Inspection.
The titanium stabilization prevents chromium carbide precipitation during prolonged exposure to elevated temperatures and after welding, improving resistance to intergranular corrosion while maintaining excellent high-temperature strength.
Yes. Every shipment includes EN 10204 3.1 Mill Test Certificates, inspection reports, complete material traceability, and third-party inspection certificates upon request.
Yes. Kamal Steels exports Stainless Steel 321 Seamless Tubes worldwide with export-standard packaging, complete documentation, and timely international delivery.
Kamal Steels offers ASTM-compliant Stainless Steel 321 Seamless Tubes with ready stock, certified quality, competitive pricing, stringent quality control, export-standard packaging, complete documentation, and dependable worldwide delivery for critical high-temperature industrial applications.