Louis Metals, a reliable stainless steel manufacturer and supplier located in Houston, USA, proudly offers top-quality Stainless Steel 347H Hex Bars, perfect for high-temperature and high-pressure applications. This stabilized austenitic stainless steel boasts a higher carbon content, making it an excellent choice for elevated temperature service and outstanding creep resistance. Our 347H hex bars are crafted to meet rigorous ASTM and ASME standards, ensuring they’re durable and perform consistently. Whether you need them for power generation, chemical processing, or refinery equipment, Louis Metals is committed to delivering 347H hex bars in both custom and standard sizes, all while maintaining quality, precision, and timely delivery across various industries.
The Stainless Steel 347H Hex Bar is composed of 17–20% chromium, 9–13% nickel, and a higher carbon content (0.04–0.10%) compared to standard 347, which enhances its strength at high temperatures. It also contains niobium (columbium), which stabilizes the alloy and helps prevent carbide precipitation during welding. With a tensile strength ranging from 515–750 MPa and a yield strength of about 205 MPa, 347H exhibits excellent creep resistance. The Brinell hardness falls between 150 and 200 HB. Thanks to its remarkable oxidation resistance and mechanical stability at elevated temperatures, 347H is ideal for pressure vessels, heat exchangers, and high-stress piping systems.
Dimensions : ASTM, ASME
Standard : ASTM / ASME SA A276, A479, ASTM A493
Length : Random, Fix & Cut Length
Size : 20MM to 150MM
| Element | C | Cr | Mn | Ni | P | S | Si |
| SS 347h | 0.08 max. | 17.0 – 19.0 | 2.00 max. | 9.0-13.0 | 0.045 max. | 0.03 max. | 0.75 max |
| Element | Density | Melting Range,℃ | Tensile Strength | Yield Strength | Elongation | Hardness (Brinell) |
| SS 347h | 7.96 | 1450 ℃ | 515 | 205 | 40 | 201 |
| HEXAGONS | ||
|---|---|---|
| Size(mm) | WT PER FEET IN KGS | WT PER MTR IN KGS |
| 16 | 0.55 | 1.79 |
| 18 | 0.69 | 2.27 |
| 20 | 0.85 | 2.80 |
| 22 | 1.03 | 3.39 |
| 25 | 1.33 | 4.38 |
| 28 | 1.67 | 5.49 |
| 30 | 1.92 | 6.30 |
| 32 | 2.19 | 7.17 |
| 36 | 2.77 | 9.07 |
| 38 | 3.08 | 10.11 |
| 40 | 3.41 | 11.20 |
| 45 | 4.32 | 14.18 |
| 50 | 5.34 | 17.50 |
| 56 | – | – |
| 60 | – | – |
| 65 | – | – |
| 70 | – | – |
| 75 | – | – |
| 80 | – | – |
| 90 | – | – |
| 100 | – | – |
Stainless Steel 347H Hex Bars are extensively utilized in high-temperature settings where resistance to heat, oxidation, and intergranular corrosion is essential. Common applications include superheaters, boiler tubes, heat exchangers, pressure vessels, and high-temperature piping in the oil & gas, petrochemical, and power generation industries. The 347H grade is particularly advantageous for welded structures that face prolonged high temperatures, thanks to its niobium stabilization and enhanced creep strength. Louis Metals provides 347H hex bars with an excellent surface finish and precise dimensions, ensuring they meet the demands of various applications.
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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