Stainless Steel 321H tubing is crafted from grade 321H (UNS S32109), which is an austenitic chromium-nickel stainless steel that’s stabilized with titanium and has a higher carbon content to enhance its strength at high temperatures. This material is known for its outstanding resistance to oxidation, corrosion, and creep when exposed to elevated temperatures.
Stainless steel 321H is a high-carbon stainless steel 321, composed of 17-19% chromium, 9-12% nickel, and up to 0.08% carbon. It is also alloyed with titanium that enhances its intergranular corrosion resistance. This alloy has good oxidation properties at high temperatures and retains good mechanical properties up to 870°C. It is highly resistant to sulfuric, hydrochloric, and phosphoric acids. Its advantages include high strength, excellent weldability and resistance to heat and corrosion, making it ideal for use in hot environments and harsh 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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The typical chemical makeup includes carbon at 0.04–0.10%, chromium between 17–19%, nickel ranging from 9–12%, and titanium up to 0.7%. In terms of mechanical properties, it boasts a minimum tensile strength of about 515 MPa, a yield strength of around 205 MPa, and an elongation of roughly 35%. You can find this tubing in both seamless and welded forms, adhering to ASTM/ASME standards like A213, A269, and A312.
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 commonly used in heat exchangers, boiler tubes, chemical processing, and in petroleum and petrochemical plants, as well as in furnace components. The “H” variant is particularly beneficial for applications requiring higher strength at elevated temperatures, making it ideal for structural or pressure applications. However, welding it requires careful handling due to its titanium stabilization.
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