Hemi Metals, located in Hamilton, New Zealand, is a reliable manufacturer and supplier of top-notch Stainless Steel 321H Flat Bars, specifically designed for high-temperature and pressure-critical industrial applications. SS 321H is a titanium-stabilized, high-carbon austenitic stainless steel that boasts exceptional strength and thermal stability even at elevated temperatures. With meticulous attention to dimensional control, a smooth surface finish, and rigorous quality inspections, these flat bars ensure outstanding mechanical reliability and a long service life. Hemi Metals caters to industries like power generation, petrochemical, refinery, and heavy engineering, where high-temperature performance and corrosion resistance are crucial.
Stainless Steel 321H is composed of about 17–19% chromium and 9–12% nickel, featuring a higher carbon content than SS 321, along with titanium stabilization to prevent carbide precipitation during high-temperature use. This unique composition grants excellent resistance to intergranular corrosion and significantly boosts high-temperature strength. Typically, SS 321H flat bars exhibit tensile strength ranging from 515–620 MPa and yield strength around 205–240 MPa, while also offering good ductility, impact toughness, and creep resistance. These bars are non-magnetic in their annealed state and maintain stable mechanical performance even after prolonged exposure to high temperatures.
Dimensions : ASTM, ASME
Standard : ASTM / ASME SA A582, A276, A564, ASTM A484, 484M
Surface : hrap, hot rolled pickled or sand blasting finished, cold drawn, polished, hairline
Range : Range – 3.17mm to 350mm dia
| SS 321H | 0.04 – 0.10 | 17.0 – 19.0 | 2.00 max. | 9.0-12.0 | 0.045 max. | 0.03 max. | 0.75 max. |
| Element | C | Cr | Mn | Ni | P | S | Si |
| SS 321H | 0.08 max. | 17.0 – 19.0 | 2.00 max. | 9.0-12.0 | 0.045 max. | 0.03 max. | 0.75 max. |
| STANDARD | WERKSTOFF NR. | UNS |
| SS 321H | 1.4438 | S32109 |
The primary alloying element in Stainless Steel 321H is titanium (Ti), which stabilizes the steel and prevents carbide precipitation during welding. It also contains chromium (Cr) for corrosion resistance and higher carbon content for increased strength at elevated temperatures.
Stainless Steel 321H is most suitable for high-temperature applications in the range of 427°C to 816°C (800°F to 1500°F). It offers excellent oxidation resistance and stability in these temperatures, making it ideal for heat exchangers and furnace components.
Typical dimensions of a Stainless Steel 321H flat bar range from 3mm to 150mm thickness, 25mm to 600mm width, and up to 6 meters in length. These dimensions vary based on manufacturer specifications and customer requirements.
Stainless Steel 321H Flat Bars find extensive use in high-temperature and pressure-intensive settings where both strength and corrosion resistance are essential. They are commonly utilized in boiler structures, superheater frames, heat exchanger supports, furnace components, exhaust system supports, and pressure vessel parts. In the petrochemical and power generation sectors, SS 321H flat bars serve as structural frameworks, piping supports, valve bodies, and expansion joints. Additionally, they are employed in refinery systems and gas processing units, showcasing their versatility and reliability in demanding environments.
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
Hemi Metals is a leading manufacturer, supplier, and exporter of high-quality bars, rods, and forgings, catering to various industries in Hamilton New Zealand
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