Louis Metals, a top-notch stainless steel manufacturer and supplier located in Houston, USA, specializes in providing high-quality Stainless Steel 321H Square Bars and Rods designed for high-temperature and pressure applications. SS 321H is a high-carbon variant of the stabilized austenitic stainless steel 321, which enhances strength and creep resistance when exposed to elevated temperatures. These square bars and rods are perfect for situations involving continuous heat exposure, particularly in chemical processing, power plants, and aerospace settings. Adhering to strict ASTM/ASME standards, Louis Metals guarantees consistent quality, precise dimensions, and quick delivery, making us a go-to partner for industrial-grade stainless steel solutions across the nation.
Stainless Steel 321H Square Bars and Rods are composed of 17–19% chromium, 9–12% nickel, and titanium (at least five times the carbon content) to prevent carbide precipitation. The “H” in its name signifies a higher carbon content (0.04–0.10%) that boosts high-temperature strength. It boasts a tensile strength ranging from 515 to 750 MPa and a yield strength of about 205 MPa. With Brinell hardness between 150 and 200 HB, SS 321H excels in resisting oxidation, intergranular corrosion, and scaling at temperatures up to 900°C (1652°F), all while maintaining its structural integrity under significant mechanical stress.
Stainless Steel 321H Square Bars Specification :
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
Size : Tolerance: H8, H9, H10, H11, H12, H13K9, K10, K11, K12
| Element | C | Cr | Mn | Ni | P | S | Si |
| 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. |
| Grade | Tensile Str (MPa) min | Yield Str 0.2% Proof (MPa) min | Elong (% in 50mm) min | Hardness | |
| Rockwell B (HR B) max | Brinell (HB) max | ||||
| 321H | 515 | 205 | 40 | 95 | 217 |
| STANDARD | WERKSTOFF NR. | UNS |
| SS 321H | 1.4438 | S32109 |
| SQUARES | ||
|---|---|---|
| Size(mm) | WT PER FEET IN KGS | WT PER MTR IN KGS |
| 16 | 0.62 | 2.05 |
| 18 | 0.79 | 2.59 |
| 20 | 0.76 | 2.49 |
| 22 | 1.18 | 3.87 |
| 25 | 1.52 | 5.00 |
| 28 | 1.91 | 6.27 |
| 30 | 2.19 | 7.20 |
| 32 | 2.50 | 8.19 |
| 36 | 3.16 | 10.37 |
| 38 | 3.52 | 11.55 |
| 40 | 3.90 | 12.80 |
| 45 | 4.94 | 16.20 |
| 50 | 6.10 | 20.00 |
| 56 | 7.65 | 25.08 |
| 60 | – | – |
| 65 | – | – |
| 70 | – | – |
| 75 | – | – |
| 80 | – | – |
| 90 | – | – |
| 100 | – | – |
Stainless Steel 321H Square Bars and Rods find extensive use in industries that require exceptional high-temperature stability and oxidation resistance. They are particularly suited for heat exchangers, pressure vessels, exhaust manifolds, furnace components, thermal oxidizers, and boiler equipment. The superior creep strength and structural performance of SS 321H at elevated temperatures make it especially valuable in the aerospace, petrochemical, and power generation sectors. Its resistance to carbide precipitation during welding ensures reliability in welded structures that are subjected to high heat. Louis Metals is committed to providing the best solutions for your stainless steel needs.
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
Louis Metals is a leading manufacturer, supplier, and exporter of high-quality bars, rods, and forgings, catering to various industries in Houston, USA
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