Nakamura Stainless, located in Pulau Ujong, Singapore, is a reliable manufacturer and supplier of high-quality stainless steel products, including stainless steel 321H tubing. This tubing is made for high-temperature applications and provides excellent resistance to oxidation and intergranular corrosion. Stainless steel 321H is a stabilized austenitic stainless steel with higher carbon content, making it suitable for environments with prolonged exposure to high temperatures. Nakamura Stainless focuses on precision manufacturing and strict quality standards, delivering 321H tubing for critical industries like aerospace, petrochemical, heat exchangers, and power generation systems.
Stainless steel 321H tubing consists of 17–19% chromium, 9–13% nickel, and titanium as a stabilizing element to prevent carbide precipitation during welding. The “H” grade has higher carbon content than standard 321, which provides better high-temperature strength and creep resistance. It has a tensile strength of about 520–750 megapascals and maintains structural stability at temperatures up to 900°C. This composition makes 321H tubing ideal for high-heat applications, ensuring great oxidation resistance, good mechanical performance, and reliable weldability without the risk of intergranular corrosion.
Standard ASTM A/ASME SA213/A249/A269/A312/A358 CL. I to V ASTM A789/A790
Dimensions ASTM, ASME and API
Range 1/2″ NB TO 24″ NB IN SCH 5, 10, 20, 40, STD, 60, 80, XS, 100, 120, 140, 160 & XXS as Per NACE MR 01 75
Thickness 0.3mm – 50 mm
Outer Diameter 6.00 mm OD up to 914.4 mm OD
Schedule SCH 10, SCH20, SCH30, SCH40, STD, SCH60, XS, SCH80, SCH120, SCH140, SCH160, XXS
Type Seamless / ERW / Welded/ Fabricated
Form Round, Square, Rectangular, Hydraulic, etc.
Length Single Random, Double Random & Cut Length
| Grade | C | Mn | Si | P | S | Cr | N | Ni | Ti |
| SS 321 | 0.08 max | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 17.00 – 19.00 | 0.10 max | 9.00 – 12.00 | 5(C+N) – 0.70 max |
| SS 321H | 0.04 – 0.10 | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 17.00 – 19.00 | 0.10 max | 9.00 – 12.00 | 4(C+N) – 0.70 max |
| Element | Grade 904L |
|---|---|
| Density | 8 |
| Melting Range | 1300 -1390 ℃ |
| Tensile Stress | 490 |
| Yield Stress (0.2%Offset) | 220 |
| Elongation | 35% minimum |
| Hardness (Brinell) | – |
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We ensures the highest standards for its stainless steel 321H tubing through rigorous testing and certification processes. Each tube undergoes a thorough evaluation, including hydrostability, chemical testing and mechanical testing. Certified to international standards such as ASTM and ASME, these containers provide reliability, durability and high performance in demanding industrial applications.
This tubing is available in sizes ranging from 1/8″ to 24″ in outer diameter. It offers excellent corrosion resistance, especially against intergranular corrosion after exposure to temperatures in the chromium carbide precipitation range of 427-816°C. Ideal for high-temperature applications requiring a continuous, strong, and uniform surface.
Available in dimensions from 1/8″ to 36″ in outer diameter, this tubing is known for its high resistance to stress and pitting corrosion. It’s frequently used in chemical processing and other high-temperature applications due to its robust performance under harsh conditions. The welding process ensures a strong, durable, and leak-proof seam
These tubes come in sizes from 1/4″ to 1″ in outer diameter, designed for excellent thermal conductivity and corrosion resistance. Ideal for high-temperature and high-pressure environments, they are used in industries such as petrochemical and power generation. Their composition resists scaling and oxidation even at elevated temperatures.
Offered in sizes from 1/8″ to 2″ in outer diameter, this tubing provides superior resistance to corrosion and high temperatures. It is used in precision instrumentation and control systems, ensuring reliable performance and accurate measurements. The tubing’s stability at high temperatures ensures minimal expansion and contraction.
These tubes, ranging from 1/2″ to 5″ in outer diameter, are designed to withstand high-pressure and high-temperature environments typical in boiler systems. They offer excellent corrosion resistance, especially against steam and hot gases. Their durability ensures long service life and reliability in energy and industrial applications.
Available in sizes from 1/4″ to 1″ in outer diameter, U-tubes are essential for heat exchanger applications requiring a compact and efficient design. They provide excellent corrosion resistance and thermal stability, making them suitable for use in petrochemical, oil refining, and power generation industries. The U-shape allows for efficient heat transfer in limited spaces.
These tubes come in sizes ranging from 1/4″ to 1″ in outer diameter and are designed for use in condenser applications where efficient heat transfer and resistance to corrosion are critical. They are commonly used in power plants, HVAC systems, and refrigeration. The tubes ensure minimal fouling and scaling over prolonged use.
Fin tubes are available in sizes from 1/2″ to 2″ in outer diameter, designed to enhance heat transfer efficiency in various industrial applications. The addition of fins increases the surface area, improving thermal performance. These tubes offer excellent resistance to high-temperature oxidation and corrosion, making them ideal for heat exchangers and boilers.
Stainless steel 321H tubing is commonly used in situations that require high strength, thermal stability, and oxidation resistance at elevated temperatures. It is often found in heat exchangers, furnace parts, superheaters, exhaust systems, and high-pressure steam piping. The higher carbon content makes it particularly suitable for high-temperature structural applications in the aerospace, power generation, and petrochemical sectors. Because of its stability during thermal cycling and resistance to sensitization, 321H tubing is perfect for welded equipment and piping systems that operate under continuous or intermittent high-temperature conditions.
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