-
-
-
Girgaon, Mumbai - 400004
Stainless Steel 321H Seamless Tubes Manufacturer in India
What Are Stainless Steel 321H Seamless Tubes?
Stainless Steel 321H Seamless Tubes are titanium-stabilized austenitic stainless steel tubes produced without a longitudinal weld for applications that demand reliable performance at elevated temperatures. Grade 321H is identified by UNS S32109 and is a higher-carbon version of 321 stainless steel, with titanium added to stabilize the material and support its resistance to chromium carbide precipitation during high-temperature service.
The controlled higher carbon content of 321H provides improved strength at elevated temperatures, while titanium stabilization helps maintain corrosion resistance after prolonged heating. This combination makes the grade particularly useful in equipment exposed to thermal cycling, high-temperature gases and process fluids. Its austenitic structure also provides good toughness, general corrosion resistance and fabrication characteristics.
For different industrial requirements, Stainless Steel 321H Seamless Tubes can be supplied to applicable ASTM and ASME specifications, including ASTM A213 and ASTM A269, depending on the tube application and service conditions. Available options include different outside diameters, wall thicknesses, schedules, surface finishes and lengths to match project specifications.
Stainless Steel 321H Seamless Tubes are commonly used in heat exchangers, power-generation equipment, refinery systems, petrochemical plants, furnace components, thermal processing equipment, aerospace applications and high-temperature process piping. The combination of titanium stabilization and elevated-temperature strength makes the grade suitable for demanding thermal environments where conventional unstabilized stainless steels may be less suitable.
Kamal Steels is a Manufacturer and Stockist of Stainless Steel 321H Seamless Tubes, offering standard and customized tubing solutions for domestic and international projects. Tubes can be supplied with MTC, inspection documentation, testing reports and export-standard packaging according to customer and project requirements.
Table of Contents
- Stainless Steel 321H Seamless Tube Specifications
- Stainless Steel 321H Seamless Tube Size Chart
- Stainless Steel 321H Seamless Tube Standards
- Stainless Steel 321H Seamless Tube Features
- Stainless Steel 321H Chemical Composition
- Stainless Steel 321H Mechanical Properties
- Stainless Steel 321H Seamless Tube Applications
- Industries Using Stainless Steel 321H Seamless Tubes
- Frequently Asked Questions
Stainless Steel 321H Seamless Tube Specifications
Stainless Steel 321H Seamless Tubes are available in different dimensions and material conditions to meet applicable standards and specific service requirements.
| Specification | Stainless Steel 321H Seamless Tubes |
|---|---|
| Material | Stainless Steel |
| Grade | 321H |
| UNS | S32109 |
| 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 321H Seamless Tube Size Chart
Stainless Steel 321H Seamless Tubes can be supplied in different outside diameters and wall thicknesses. Standard and customized dimensions are available according to equipment design, pressure, temperature and service requirements.
| 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 321H Seamless Tube Standards
The appropriate specification depends on the intended service, tube dimensions and manufacturing requirements. Common standards for Stainless Steel 321H Seamless Tubes 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 321H Seamless Tube Features
The titanium-stabilized chemistry of 321H provides a combination of elevated-temperature strength, corrosion resistance and structural stability for demanding thermal applications.
- Excellent high-temperature strength
- Titanium-stabilized austenitic structure
- Good resistance to intergranular corrosion after heating
- Good creep and stress-rupture characteristics
- Good resistance to oxidation at elevated temperatures
- Good general corrosion resistance
- Higher carbon content than standard 321 grade
- Suitable for prolonged thermal exposure
- Good toughness and fabrication characteristics
- Available in different sizes, wall thicknesses and finishes
Stainless Steel 321H Chemical Composition
Stainless Steel 321H combines chromium and nickel with titanium stabilization and a controlled higher carbon level. The chemistry is designed to support strength and corrosion resistance during elevated-temperature service.
| Element | Composition (%) |
|---|---|
| Chromium | 17.0 - 19.0 |
| Nickel | 9.0 - 12.0 |
| Titanium | 5 × C min. to 0.70 max. |
| Carbon | 0.04 - 0.10 |
| Manganese | 2.00 max. |
| Silicon | 0.75 max. |
| Phosphorus | 0.045 max. |
| Sulfur | 0.030 max. |
| Iron | Balance |
Stainless Steel 321H Mechanical Properties
The mechanical characteristics of 321H support its use in high-temperature tubular equipment. Typical minimum requirements for the grade 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 verified against the applicable material specification, dimensions and material test certificate.
Stainless Steel 321H Seamless Tube Applications
The combination of titanium stabilization and elevated-temperature strength allows 321H seamless tubing to perform in equipment exposed to prolonged heating, thermal cycling and corrosive process environments.
Power Generation
Used in high-temperature process equipment and systems exposed to elevated thermal conditions.
Heat Exchangers
Suitable for heat-transfer equipment requiring corrosion resistance and thermal stability.
Refinery Equipment
Used in process equipment operating at elevated temperatures and demanding service conditions.
Chemical Processing
Used in selected process systems exposed to heat and corrosive process media.
Furnace Equipment
Used in tubular components exposed to prolonged heating and thermal cycling.
Petrochemical Systems
Used in high-temperature process and fluid-handling applications.
Industries Using Stainless Steel 321H Seamless Tubes
Stainless Steel 321H seamless tubing is used in industries where high-temperature strength, stabilization and corrosion resistance are required for reliable equipment performance.
Power Industry
Used in selected high-temperature equipment and power-generation systems.
Refinery Industry
Used in process systems exposed to elevated temperatures and corrosive media.
Chemical Industry
Used in process equipment requiring stabilized stainless steel tubing for thermal service.
Petrochemical Industry
Used in high-temperature process and fluid-handling applications.
Aerospace Industry
Used in selected high-temperature components and systems requiring heat-resistant stainless steel.
Engineering Industry
Used in specialized tubular equipment designed for elevated-temperature operation.
Frequently Asked Questions
Stainless Steel 321H Seamless Tubes are high-carbon, titanium-stabilized austenitic stainless steel tubes manufactured from Stainless Steel 321H (UNS S32109 / WNR 1.4878). They provide excellent creep strength, oxidation resistance, and dependable performance in elevated-temperature applications.
Our Stainless Steel 321H Seamless Tubes are manufactured according to ASTM A213, ASTM A269, ASME SA213, and ASME SA269 international standards.
SS 321H Seamless Tubes offer excellent creep strength, superior oxidation resistance, outstanding resistance to thermal fatigue, intergranular corrosion, and prolonged high-temperature service while maintaining excellent mechanical strength.
They are widely used in boilers, superheaters, petrochemical plants, refineries, heat exchangers, thermal processing equipment, power generation facilities, and chemical processing industries.
SS 321H 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.
SS 321H contains a higher carbon content than SS 321, providing improved creep strength and better mechanical properties during continuous high-temperature service while retaining titanium stabilization for resistance to intergranular corrosion.
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 321H Seamless Tubes worldwide with export-standard packaging, complete documentation, and timely international delivery.
Kamal Steels offers ASTM-compliant Stainless Steel 321H 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.