SS 321H Seamless Pipes Manufacturer and Supplier in Thailand
Stainless Steel 321H Seamless Pipes is a titanium-stabilised, high-carbon austenitic stainless steel known for its excellent strength and resistance to high temperatures and oxidation. Thaida Stainless Steel Manufacturing (Thailand) Co., Ltd. brings years of expertise in producing Stainless Steel 321H Seamless Pipes for industrial applications. We offer a wide range of sizes, wall thicknesses and grades to suit specific requirements across sectors like power generation, chemical processing and refineries. Every pipe is quality-tested for reliability, and our commitment to standards is supported by the ISO certification held by our mother company, ensuring consistent product performance.
Other Related Products
- Stainless Steel Pipes
- Stainless Steel Seamless Pipes
- Stainless Steel 304 Seamless Pipes
- Stainless Steel 304L Seamless Pipes
- Stainless Steel 309 Seamless Pipes
- Stainless Steel Seamless 310 Pipes
- Stainless Steel 316 Seamless Pipes
- Stainless Steel 316Ti Seamless Pipes
- Stainless Steel 317 Seamless Pipes
- Stainless Steel 321 Seamless Pipes
- Stainless Steel 347 Seamless Pipes
- Stainless Steel 904L Seamless Pipes
Product Description - Stainless Steel 321H Seamless Pipes
Stainless Steel 321H Seamless Pipes are titanium-stabilized austenitic stainless steel pipes, engineered for superior performance in high-temperature and high-pressure environments. With a higher carbon content than standard 321, 321H Stainless Steel Pipes (UNS S32109) offer enhanced creep strength and better heat resistance compared to 321 and 304 grades. These pipes maintain excellent stability and corrosion resistance at temperatures ranging from 800°F to 1500°F (427°C to 816°C).
Stainless Steel 321H Seamless Pipes are available in various sizes from 1/8” to 24”, with wall thickness options like SCH 10, SCH 40, and SCH 80, and finishes including pickled, polished, and bright annealed. Manufactured under ASTM A312, ASME SA312, UNS S32109, and WNR 1.4878 standards, ensuring top reliability and quality. Ideal for engineers and buyers needing durable pipes.
Key Benefits of Stainless Steel 321H Seamless Pipes
Discover the key benefits below that make Stainless Steel 321H Seamless Pipes the preferred choice for high-performance industrial applications.
High-Temperature Resistance
Specially designed to maintain strength and structural integrity even at elevated temperatures, making it ideal for challenging environments.
Corrosion Resistance
Durability
With superior high-temperature resistance, these pipes deliver outstanding durability and longevity under continuous stress and heat.
Strength
Weldability
The titanium-stabilised composition minimises the risk of intergranular corrosion after welding, ensuring strong, clean joints in fabrication and assembly.
Versatility
Widely used in various industries and even in specialised plumbing pipes for high-temperature fluid systems.
Why Choose Our Stainless Steel 321H Seamless Pipes?
Thaida offers 1.4878 Seamless Pipes, known for their high quality, strength, and reliability in critical applications. Manufactured under strict production standards, each pipe meets ASTM and ASME certifications. Ideal for high-pressure steam pipelines and industrial use, our pipes deliver consistent performance without compromise. We provide competitive pricing, timely delivery, excellent customer support, and strong product warranties. With advanced technology and an expert team, we are your trusted partner for stainless steel solutions.
Competitive Pricing
Global Exports Expertise
Large Inventory & Fast Dispatch
Custom Sizes & Finishes
Industry Certifications & Compliance
Advanced Production Technology
After-Sales Support, Service- Technical Support
In-House Testing & Full Traceability
Stainless Steel 321H Seamless Pipes Specifications
The following Stainless steel 321H seamless pipe specifications highlight size, wall thickness, grade, and applicable industry codes.
| Specifications | ASTM A312 / ASTM SA312 |
|---|---|
| Range | 6NB to 1200NB |
| Outer Diameter | 1/8" NPS to 12" NPS |
| Thickness | 0.6 mm to 12.7 mm |
| Schedules | SCH. 5, 10, 20, 30, 40, 60, 80, 100, 120, 140, 160, XXS |
| Length | Single Random, Double Random & Cut Length |
| Types | Round, Square, Rectangle |
| End | Plain End, Beveled End |
Chemical Composition of ASTM A312 TP321H Seamless Pipes
This chemical composition table for stainless steel UNS S32109 seamless pipes outlines percentages of major elements like carbon, chromium, nickel, and molybdenum.
| Grade | C | Mn | Si | P | S | Cr | Ni | Mo | Ti |
|---|---|---|---|---|---|---|---|---|---|
| 321H | 0.04-0.10 | ≤2.00 | ≤1.00 | ≤0.045 | ≤0.03 | 17.00–19.00 | 9.00–12.00 | – | 4×(C+N)–0.70 |
Mechanical Properties of Stainless Steel 321H Seamless Pipes
| Grade | Tensile Strength ksi (min.) |
Yield Strength 0.2% Offset ksi (min.) |
Elongation - % in 50 mm (min.) |
Hardness (Brinell) MAX |
|---|---|---|---|---|
| 321H | 75 | 30 | 40 | 217 |
Physical Properties of Stainless Steel 321H Seamless Pipes
| Denstiy lbm/in3 |
Coefficient of Thermal Expansion (min/in)-°F |
Thermal Conductivity BTU/hr-ft-°F | Specific Heat BTU/lbm -°F | Modules of Elasticity (annealed)2-psi | |
|---|---|---|---|---|---|
| at 68 °F | at 68 – 212°F | at 68 – 1832°F | at 200°F | at 32 – 212°F | in tension (E) |
| 0.286 | 9.2 | 20.5 | 9.3 | 0.12 | 28 x 106 |
Grade Specification Comparison of Stainless Steel 321H Seamless Pipes
| Grade | UNS No | Old British | Euronorm | Swedish SS | Japanese JIS | ||
|---|---|---|---|---|---|---|---|
| BS | En | No | Name | ||||
| 321H | S32109 | 321S51 | - | 1.4878 | X10CrNiTi18-10 | - | SUS 321H |
Equivalent Material of Stainless Steel 321H Seamless Pipes
| STANDARD | UNS | WNR. | EN | JIS |
|---|---|---|---|---|
| SS 321H | S32109 | 1.4878 | X12CrNiTi18-9 | SUS 321H |
Stainless Steel 321H Seamless Pipes Price
The table below provides a clear overview of pricing based on various factors such as pipe size, grade and quantity, helping you make an informed decision for your project needs.
| Nominal Bore (NB) | Schedule | Price (INR/kg) |
|---|---|---|
| 15 NB | SCH 10/40/80/160 | 427 |
| 20 NB | SCH 10/40/80/160 | 427 |
| 25 NB | SCH 10/40/80/160 | 384 |
| 32 NB | SCH 10/40/80 | 372 |
| 32 NB | SCH 160 | 409 |
| 40 NB | SCH 10/40/80 | 372 |
| 40 NB | SCH 160 | 409 |
| 50 NB | SCH 10/40/80 | 354 |
| 65 NB | SCH 10/40 | 354 |
| 65 NB | SCH 80 | 366 |
| 80 NB | SCH 10/40 | 354 |
| 80 NB | SCH 80 | 366 |
| 90 NB | SCH 10/40 | 378 |
| 100 NB | SCH 10/40 | 378 |
| 125 NB | SCH 10/40/80 | 427 |
| 150 NB | SCH 10/40/80 | 433 |
| 200 NB | SCH 10/20/40 | 445 |
| 250 NB | SCH 10/20/30/40 | 476 |
| 250 NB | SCH 80 | 506 |
| 300 NB | SCH 10/20/30/STD/40/XS/80 | 611 |
Stainless Steel 321H Seamless Pipes Dimensions In Inches
| Nominal size in inches | Outside diameter in inches | Outside diameter in mm | Wall thickness in inches | Wall thickness in mm | Weight [lbs/feet] | Weight [kg/meter] |
|---|---|---|---|---|---|---|
| 1/8 6 | 0.41 | 10.3 | 0.068 | 1.73 | 0.24 | 0.37 |
| 1/4 8 | 0.54 | 13.7 | 0.088 | 2.24 | 0.42 | 0.63 |
| 3/8 10 | 0.68 | 17.1 | 0.091 | 2.31 | 0.57 | 0.84 |
| 1/2 15 | 0.84 | 21.3 | 0.109 | 2.77 | 0.85 | 1.27 |
| 3/4 20 | 1.05 | 26.7 | 0.113 | 2.87 | 1.13 | 1.69 |
| 1 25 | 1.32 | 33.4 | 0.133 | 3.38 | 1.68 | 2.5 |
| 1 1/4 32 | 1.66 | 42.2 | 0.14 | 3.56 | 2.27 | 3.39 |
| 1 1/2 40 | 1.9 | 48.3 | 0.145 | 3.68 | 2.72 | 4.05 |
| 2 50 | 2.375 | 60.3 | 0.154 | 3.91 | 3.65 | 5.44 |
| 2 1/2 65 | 2.875 | 73 | 0.203 | 5.16 | 5.79 | 8.63 |
| 3 80 | 3.5 | 88.9 | 0.216 | 5.49 | 7.58 | 11.29 |
| 3 1/2 90 | 4 | 101.6 | 0.226 | 5.74 | 9.11 | 13.57 |
| 4 100 | 4.5 | 114.3 | 0.237 | 6.02 | 10.79 | 16.07 |
| 5 125 | 5.563 | 141.3 | 0.258 | 6.55 | 14.62 | 21.77 |
| 6 150 | 6.625 | 168.3 | 0.28 | 7.11 | 18.97 | 28.26 |
| 8 200 | 8.625 | 219.1 | 0.322 | 8.18 | 28.55 | 42.55 |
| 10 250 | 10.75 | 273 | 0.365 | 9.27 | 40.48 | 60.31 |
| 12 300 | 12.75 | 323.8 | 0.406 | 10.31 | 53.52 | 79.73 |
| 14 350 | 14 | 355.6 | 0.437 | 11.13 | 54.57 | 94.55 |
| 16 400 | 16 | 406.4 | 0.5 | 12.7 | 82.77 | 123.3 |
| 18 450 | 18 | 457 | 0.562 | 14.27 | 104.67 | 155.8 |
| 20 500 | 20 | 508 | 0.594 | 15.09 | 123.11 | 183.42 |
| 24 600 | 24 | 610 | 0.688 | 17.48 | 171.29 | 255.41 |
| 32 800 | 32 | 813 | 0.688 | 17.48 | 230.08 | 342.91 |
Stainless Steel 321H Seamless Pipes Size Chart
| Nominal Pipes Size (NPS) | Outside Diameter (inches) | Schedule 40 Wall Thickness (inches) | Schedule 80 Wall Thickness (inches) |
|---|---|---|---|
| 1/8" | 0.405" | 0.068" | 0.095" |
| 1/4" | 0.540" | 0.088" | 0.119" |
| 3/8" | 0.675" | 0.091" | 0.126" |
| 1/2" | 0.840" | 0.109" | 0.147" |
| 3/4" | 1.050" | 0.113" | 0.154" |
| 1" | 1.315" | 0.133" | 0.179" |
| 1-1/4" | 1.660" | 0.140" | 0.191" |
| 1-1/2" | 1.900" | 0.145" | 0.200" |
| 2" | 2.375" | 0.154" | 0.218" |
| 2-1/2" | 2.875" | 0.203" | 0.276" |
| 3" | 3.500" | 0.216" | 0.300" |
| 4" | 4.500" | 0.237" | 0.337" |
| 5" | 5.563" | 0.258" | 0.375" |
| 6" | 6.625" | 0.280" | 0.432" |
| 8" | 8.625" | 0.322" | 0.500" |
| 10" | 10.750" | 0.365" | 0.593" |
| 12" | 12.750" | 0.375" | 0.687" |
Stainless Steel 321H Seamless Pipes Manufacturing Process
Here’s a step-by-step process involved in manufacturing stainless steel 321H seamless pipes.
1. Raw Material Selection
High-quality stainless steel billets and strips are carefully selected for superior strength and corrosion resistance.
2. Pipes Formation
The selected raw material is formed into pipes using seamless extrusion methods, depending on the application.
3. Heat Treatment
Pipes undergo required controlled heat treatment to enhance mechanical properties and relieve internal stresses.
4. Cold Working and Finishing
After heat treatment, pipes are cold-worked for better surface finish, dimensional accuracy and improved strength.
5. Quality Control and Testing
Every pipe is thoroughly inspected and tested to ensure it meets international quality standards for performance and reliability.
Application Of Stainless Steel 321H Seamless Pipes
Stainless Steel 321H Seamless Pipes are primarily used in the power generation industry, making it the sector with the highest demand for this grade. These pipes are installed in superheaters, reheaters, boiler tubes, and heat exchangers where prolonged exposure to high temperatures is common. Their high-temperature capability makes them ideal for thermal power plants and industrial boilers. Additionally, they are used in chemical processing units for conveying hot, corrosive fluids and in refineries for furnace and heat transfer applications. Their ability to maintain structural integrity under thermal stress is what makes them essential in these high-heat environments.
Oil and Gas Industry
Chemical and Petrochemical Industry
Food and Beverage Industry
Pharmaceutical & Biotechnology
Construction and Architecture
Automotive and Transportation
Aerospace & Defense
Water and Wastewater Treatment
Power Generation & Heat Exchange
FAQ's
What is the temperature range of SS 321H?
The temperature range of our stainless steel UNS S32109 is between 427°C to 816°C (800°F to 1500°F), making it ideal for high-temperature applications like high-pressure steam pipes.
What are the properties of 321H material?
321H material offers high-temperature strength, good oxidation resistance, enhanced creep resistance, and excellent weldability, making it ideal for elevated temperature applications.
Which is better, SS 316 or SS 321H Seamless Pipes?
SS 316 is better for corrosion resistance, while SS 321H is preferred for high-temperature strength. The best choice depends on your application needs.