Njabulo Stainless is a reputable manufacturer and supplier located in Cape Town, South Africa, known for its top-notch Stainless Steel 321H Tubing. With a solid track record in precision engineering and dependability, the company delivers robust tubing solutions that excel in high-temperature and corrosive settings. Njabulo Stainless ensures that its products meet international standards, guaranteeing consistent quality and performance across various sectors, including petrochemical, power generation, and aerospace. By merging cutting-edge manufacturing techniques with outstanding customer service, Njabulo Stainless has established itself as a go-to partner for stainless steel tubing solutions not just in South Africa, but beyond.
Stainless Steel 321H Tubing is a titanium-stabilized austenitic alloy that contains chromium (17–19%), nickel (9–12%), and titanium (at least five times the carbon content). This alloy boasts superior resistance to intergranular corrosion and remarkable strength at high temperatures. It has a tensile strength of around 515 MPa, a yield strength of 205 MPa, and an elongation of 40%. With impressive creep and stress rupture properties, 321H tubing is perfect for prolonged exposure to high temperatures, ensuring it maintains its structural integrity and oxidation resistance in tough industrial conditions.
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.
This type of tubing is widely utilized in industries that demand materials capable of withstanding high temperatures and corrosion. Typical applications include heat exchangers, exhaust manifolds, furnace components, chemical processing equipment, and parts for aerospace engines. It’s also heavily used in refineries, power plants, and marine environments where thermal stability and mechanical strength are crucial. The titanium stabilization of the alloy prevents carbide precipitation, making it ideal for continuous use in temperatures ranging from 800 to 1500°F (427 to 816°C). Njabulo Stainless provides 321H Tubing that meets the stringent requirements of industrial, mechanical, and structural applications around the globe.
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