321 SS Seamless Pipes Manufacturer and Supplier in Thailand

Stainless Steel 321 Seamless Pipe is a high-performance pipe made with titanium-stabilized austenitic steel, offering excellent resistance to high temperatures and intergranular corrosion. Thaida Stainless Steel Manufacturing (Thailand) Co., Ltd. is a leading manufacturer and exporter of 321 stainless steel seamless pipes for global industries. These qualities make them ideal for use in industries like chemical processing, oil & gas, heat exchangers, and power generation. With various grades like 321H, multiple wall thicknesses, and schedule options, we ensure our products suit a wide range of industrial needs.

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Product Description: Stainless Steel 321 Seamless Pipes

Stainless Steel 321 Seamless Pipes are designed for excellent performance in high-temperature and high-pressure environments. With a chemical composition that includes chromium (17–19%), nickel (9–12%), and titanium (≥5xC%), these pipes offer an improved resistance to intergranular corrosion compared to SS 304 and better oxidation resistance at elevated temperatures than SS 316. These pipes are ideal for temperatures up to 900°C, making them reliable in applications like heat exchangers, boilers, exhaust systems, refineries, and aerospace components.

Compared to welded pipes, seamless 321 stainless steel pipe in seamless form has a superior structural integrity, making it preferred for critical systems where high pressure ratings and thermal stresses are common. They meet with key industry standards including ASTM A312, DIN 1.4541, and UNS S32100.

Available in Schedule 10 and Schedule 40, our pipes range from 1/8” to 24” in diameter with customizable lengths and finishes such as annealed, pickled, or polished. We also supply stainless steel seamless tubing for precision engineering needs, ensuring both performance and durability.

Benefits of Using Stainless Steel 321 Seamless Pipes

The key benefits section for Stainless Steel 321 Seamless Pipe outlines High-temperature strength with stable mechanical properties and excellent oxidation resistance.

Performs efficiently in continuous service up to 900°C, ideal for high-heat industrial operations.

Maintains structural integrity under fluctuating temperatures, reducing risk of fatigue failure.

Withstands internal stress without deformation or leaks, making it suitable for critical pressure lines.

Resists metal degradation and dimensional changes under prolonged heat and load, ensuring safe operation in extreme environments.

Why Choose Our Stainless Steel 321 Seamless Pipes?

We are a leading manufacturer and exporter of 321 stainless steel seamless pipe, committed to delivering high-performance piping solutions for global industries. Our SS 321 pipes are known for their exceptional strength, corrosion resistance and ability to perform under extreme temperatures and pressure. With state-of-the-art manufacturing facilities and strict quality control at every stage, we ensure each pipe meets international standards like ASTM A312, DIN 1.4541 and UNS S32100. What truly sets us apart is our unwavering priority for quality and customer satisfaction we offer precise dimensions, custom specifications, and responsive support to meet every project need. We are your reliable partner for superior seamless piping solutions.

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ASTM A312 TP321 Seamless Pipes Specification

This ASTM A312 TP321 Seamless Pipe Specifications section includes grade, pipe size, wall thickness, and surface finish details.

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, Hydraulic, Honed Tubes
End	Plain End, Beveled End

321 Stainless Steel Seamless Pipes Price

Below is a detailed overview of the 321 stainless steel seamless pipe price, offering insights into the factors that influence cost, such as size, grade, and quantity, ensuring customers receive value for money without compromising on quality.

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	All Schedules	₹611

Chemical Composition of Stainless Steel 321 Seamless Pipes

This Stainless steel 321 seamless pipe chemical composition table includes chromium, nickel, carbon, manganese, and other key alloy elements.

Grade	C	Mn	Si	P	S	Cr	Ni	Mo	Ti
321	≤0.08	≤2.00	≤1.00	≤0.045	≤0.03	17.00–19.00	9.00–12.00	–	/

Mechanical Properties of Stainless Steel 321 Seamless Pipes

This section details the mechanical properties of Stainless Steel 321 Seamless Pipes, such as tensile strength, yield strength, and elongation.

Grade	Tensile Strength ksi (min.)	Yield Strength 0.2% Offset ksi (min.)	Elongation - % in 50 mm (min.)	Hardness (Brinell) MAX
321	75	30	40	217

Physical Properties of Stainless Steel 321 Seamless Pipes

Explore the physical properties of stainless steel 321 seamless pipes, including thermal expansion, specific heat, conductivity, and modulus of elasticity.

Denstiy lb_m/in³	Coefficient of Thermal Expansion (min/in)-°F		Thermal Conductivity BTU/hr-ft-°F	Specific Heat BTU/lb_m -°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

Manufacturing Process of Stainless Steel 321 Seamless Pipes

The five steps involved in manufacturing stainless steel 321 seamless pipes with precision and consistency.

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.

Applications of Stainless Steel 321 Seamless Pipes

Stainless Steel 321 Seamless Pipes are primarily used in the petrochemical and refinery industry for high-temperature fluid transport systems. These pipes are widely installed in heat exchangers, furnace parts, and catalytic cracking. Additionally, they are used in thermal power plants, chemical processing units, and even aircraft exhaust systems, where durability under thermal stress is crucial.

Oil and Gas Industry

Chemical and Petrochemical Industry

Food and Beverage Industry

Pharmaceutical & Biotechnology

Automotive and Transportation

Aerospace & Defense

Construction and Architecture

Marine & Shipbuilding

Water Treatment & Plumbing

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FAQ's

Which industries commonly use Stainless Steel 321 Seamless Pipes?

SS 321 seamless pipes are highly valued across several industries for their high-temperature strength and corrosion resistance. Key industries include aerospace and aviation (exhaust systems), chemical and petrochemical (refinery piping and heat exchangers), and power generation (boiler and superheater tubes). They are also applied in oil and gas, food processing, and textile production, where demanding conditions exist.

Are custom sizes or tolerances available for Stainless Steel 321 Seamless Pipes?

Yes, custom sizes and tolerances for Stainless Steel 321 seamless pipes are available, as manufacturers can produce them in various shapes, lengths, and dimensions to meet specific client requirements. Suppliers offer customization in terms of shape (round, square, or rectangular), wall thickness, and length, including custom-cut lengths.

Can Stainless Steel 321 Seamless Pipes handle high-pressure applications?

Yes, SS 321 seamless pipes can handle high-pressure applications, especially those involving high temperatures, due to their high strength and resistance to corrosion and heat. The addition of titanium stabilizes the alloy, preventing intergranular corrosion and maintaining strength in high-heat environments.

Are Stainless Steel 321 Seamless Pipes recommended for outdoor or architectural use?

SS 321 seamless pipes may not be suitable for architectural or outdoor aesthetic applications due to its finish and susceptibility to cosmetic corrosion. While the titanium stabilizer is necessary for high-temperature performance (to avoid intergranular corrosion), it reduces polishability, resulting in a coarser surface. Additionally, it is more susceptible to pitting in chloride-rich conditions than grades like SS 304 and 316, rendering it visually unappealing over time.

What is 321 stainless steel used for?

321 stainless steel is a versatile alloy often selected for high-temperature applications, particularly in the 427-816°C range, due to its titanium stability. This feature reduces intergranular corrosion by preventing chromium carbide formation after welding. Its primary applications are in demanding industries such as aerospace (exhaust systems), chemical processing (heat exchangers), power generation (boiler tubes), and automotive (exhaust manifolds).

Is 321 stainless better than 316?

Both SS 321 and SS 316 are excellent stainless steels, but both excel in different areas. Titanium-stabilized SS 321 is effective for high-temperature applications (up to 900°C) due to its resistance to intergranular corrosion after welding. SS 316, on the other hand, has higher corrosion resistance, particularly in chloride and marine conditions, due to its molybdenum component, but it is less suitable for prolonged high-temperature exposure.

What is the maximum temperature for 321 stainless steel?

321 stainless steel can withstand temperatures up to 870°C (1600°F) in intermittent service and 925°C (1700°F) in continuous service. Its titanium stabilization provides excellent oxidation resistance and prevents chromium carbide precipitation, ensuring durability and resistance to intergranular corrosion at elevated temperatures.

What is 321 material grade?

321 stainless steel is a titanium-stabilized austenitic alloy that offers excellent resistance to intergranular corrosion and oxidation at high temperatures. It maintains good strength, toughness, and weldability, making it suitable for applications involving prolonged heating or thermal cycling. The added titanium prevents carbide precipitation, ensuring stability and durability in demanding environments.