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Home > Stainless Steel Tubing > Stainless Steel 321H Tubing
Blundell Pipes and Tubes, located in Hamilton, New Zealand, stands out as a top manufacturer and supplier of premium Stainless Steel 321H Tubing. Known for its precision engineering and dependable performance, the company crafts tubing that can handle high temperatures while providing outstanding resistance to intergranular corrosion. Thanks to cutting-edge manufacturing methods and rigorous quality control, Blundell Pipes and Tubes guarantees that each product adheres to both national and international standards. Stainless Steel 321H Tubing is perfect for tough industrial applications, such as petrochemical, power generation, aerospace, and chemical processing, delivering long-lasting, heat-resistant, and corrosion-resistant solutions for critical systems.
Stainless Steel 321H Tubing is a high-carbon variant of type 321, which offers higher strength and creep resistance at higher temperatures. It has 17–19% chromium, 9–12% nickel, and is stabilized with titanium, and it has an increased carbon content (up to 0.10%) for better performance at elevated temperatures. This tubing is capable of delivering a tensile strength of 515–750 MPa and a yield strength of about 205 MPa. It is resistant to intergranular corrosion, oxidation, and heat fatigue, and it sustains structural integrity and mechanical properties to 900°C under constant heat exposure.
Specifications : ASTM A312 / ASME SA312
Outside Diameter : 6.00 mm OD up to 914.4 mm OD, Sizes up to 24″ NB available Ex-stock, OD Size available Ex-stock
Thickness : 0.3mm – 50 mm, SCH 5, SCH10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XXS, SCH XS
Size : 1/2″ NB – 24″ NB
Type : Seamless
Form: Round Pipes, Square Pipes, Rectangular Pipes.
Length : Single Random, Double Random & Required Length
End : Plain End, Beveled End, Treaded
| Grade | C | Mn | Si | P | S | Cr | N | Ni | Ti |
| SS 321H | 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 |
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 8.0 g/cm3 | 1457 °C (2650 °F) | Psi – 75000, MPa – 515 | Psi – 30000, MPa – 205 | 35 % |
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
This tubing is made from a blend of iron, chromium, nickel, and titanium, with a carefully controlled carbon content to boost its strength at high temperatures. The addition of titanium stabilizes the steel, preventing chromium carbide precipitation and enhancing its resistance to intergranular corrosion. On the mechanical side, 321H tubing boasts impressive tensile and yield strength, toughness, and excellent creep resistance even at elevated temperatures. It also offers remarkable weldability, oxidation resistance, and thermal stability, making it a go-to choice for industrial applications that require durability under extreme heat, pressure, and corrosive environments.
Blundell Pipes and Tubes, a leading supplier of Stainless Steel 321H Tubing in Hamilton, New Zealand, provides a wide selection of premium pipes and tubes for diverse industrial applications. With a vast inventory and a strong focus on delivering outstanding service, they are the preferred choice for stainless steel products in the region.
Industries that need heat-resistant, corrosion-resistant, and high-strength piping solutions widely utilize Stainless Steel 321H Tubing. It’s commonly found in boilers, heat exchangers, superheaters, and chemical processing equipment. The petrochemical and power generation sectors rely on it for steam lines, furnace components, and high-temperature process pipelines. Additionally, the aerospace and marine industries depend on 321H tubing for structural components and high-temperature fluid transport. Its unique combination of mechanical strength, corrosion resistance, and thermal stability makes it an essential material in these demanding fields.
SS 321H Tubing finds extensive applications in high-temperature service conditions such as superheaters, heat exchangers, boilers, furnace parts, and refinery piping systems. It is suitable for welded components and pressure-carrying systems that undergo constant thermal cycling. The increased content of carbon supports improved retention of strength in harsh environments, while the titanium stabilization helps eliminate sensitization when welding. Stainless Steel 321H Tubing provides a trusted and long-lasting solution for industries needing consistent mechanical strength, corrosion resistance, and long-term performance under high-temperature and pressure conditions.
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