Semih Metals, based in Istanbul, Turkey, is a reliable manufacturer and supplier of Stainless Steel 321H Flat Bars. They pride themselves on delivering top-notch stainless steel products that are designed for exceptional strength, durability, and resistance to high-temperature corrosion and oxidation. Crafted with precision and under strict quality control, these flat bars boast impressive dimensional accuracy, a smooth surface finish, and dependable mechanical performance. Semih Metals guarantees that their Stainless Steel 321H Flat Bars meet the rigorous standards of various industries, including chemical processing, petrochemical, aerospace, power generation, and marine, where materials need to perform consistently in high temperatures and corrosive environments.
The composition of Stainless Steel 321H Flat Bars primarily includes iron, chromium (17–19%), nickel (9–12%), and a touch of titanium, featuring a higher carbon content than standard 321 (typically ≥0.04%). The addition of titanium acts as a stabilizer, preventing chromium carbide precipitation during welding, which ensures excellent resistance to intergranular corrosion. On the mechanical side, 321H provides enhanced tensile and yield strength, good toughness, and reliable performance even at elevated temperatures. Its unique blend of corrosion resistance, oxidation resistance, and high-temperature strength makes it perfect for structural and engineering applications that require durability under thermal stress.
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.
These Stainless Steel 321H Flat Bars find their way into a variety of applications that call for high-temperature strength and corrosion resistance. You’ll often see them in furnace components, heat exchangers, boiler parts, exhaust systems, chemical processing equipment, and aerospace structures. They’re also utilized in marine and offshore equipment, power generation systems, and other settings that experience thermal cycling and corrosive conditions. Thanks to their outstanding durability, mechanical strength, and resistance to intergranular corrosion, Stainless Steel 321H Flat Bars are a go-to choice for many demanding applications.
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
Semih Metals is a leading manufacturer, supplier, and exporter of high-quality bars, rods, and forgings, catering to various industries in Istanbul, Turkey
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