Rupal Metals is a well-respected manufacturer and supplier of Stainless Steel 321H Flat Bars based in Delhi, India. They specialize in providing high-quality, heat-resistant flat bars that are perfect for tough industrial settings. SS 321H is a high-carbon variant of SS 321, crafted specifically to offer improved strength at high temperatures along with excellent resistance to oxidation and intergranular corrosion. These flat bars are ideal for pressure-containing and structural applications where temperatures run high. Rupal Metals provides SS 321H flat bars in various sizes and surface finishes, catering to industries such as petrochemicals, power generation, aerospace, thermal processing, and furnace manufacturing.
Stainless Steel 321H Flat Bars are primarily composed of Chromium (17–19%), Nickel (9–12%), and Titanium (≥5xC), featuring a higher Carbon content (0.04–0.10%) compared to standard SS 321, which boosts their high-temperature strength. This alloy boasts a tensile strength of around 515 MPa and a yield strength of 205 MPa. SS 321H is known for its remarkable resistance to scaling, stress rupture, and creep at elevated temperatures. The titanium stabilization helps prevent carbide precipitation, ensuring good weldability and resistance to intergranular corrosion, especially during extended thermal service.
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 applications that demand exceptional performance under high-temperature and high-pressure conditions. They are commonly used in heat exchangers, refinery equipment, pressure vessels, combustion chambers, expansion joints, and boiler components. The increased carbon content provides enhanced mechanical strength, making them suitable for challenging thermal cycles and oxidizing environments. SS 321H flat bars are also ideal for aerospace parts, exhaust systems, and thermal oxidizers. Their flat design makes them perfect for structural reinforcements and frame supports. The alloy’s durability and resistance to thermal fatigue and corrosion make it a top choice for critical applications.
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
Rupal Metals is a leading manufacturer, supplier, and exporter of high-quality bars, rods, and forgings, catering to various industries in Delhi, India
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