Hemi Metals, located in Hamilton, New Zealand, is a reliable manufacturer and supplier of top-notch Stainless Steel 347H Hex Bars, specifically designed for high-temperature and pressure-critical industrial applications. SS 347H is a niobium-stabilized, high-carbon austenitic stainless steel that excels in creep resistance and maintains long-term strength even at elevated temperatures. With a focus on strict dimensional accuracy, precise hex profiles, and rigorous quality control, these hex bars guarantee exceptional mechanical reliability and thermal stability. Hemi Metals provides SS 347H hex bars to industries like power generation, petrochemical, refinery, and heavy engineering, where high-temperature performance and structural durability are vital.
Stainless Steel 347H is composed of about 17–19% chromium and 9–13% nickel, featuring a higher carbon content and niobium stabilization to prevent carbide precipitation during high-temperature use. This unique composition ensures excellent resistance to intergranular corrosion and remarkable creep strength. Typically, SS 347H hex bars deliver tensile strength in the range of 515–620 MPa and yield strength around 205–240 MPa, along with good ductility and impact toughness. These bars are non-magnetic when annealed and maintain stable mechanical properties even after prolonged exposure to high temperatures.
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 | – | – |
SS 347H stainless steel contains high carbon content (0.04–0.10%), along with chromium (17–19%) and nickel (9–12%), which enhance its resistance to high temperatures and intergranular corrosion. Its stabilizing addition of tantalum or niobium prevents carbide precipitation, making it ideal for high-stress applications like hexagonal bars.
The high carbon content in SS 347H enhances its high-temperature strength and resistance to creep, making it suitable for extreme heat environments. Unlike lower-carbon steels, it stabilizes its microstructure, preventing carbide precipitation and improving oxidation resistance, which is crucial for high-temperature applications compared to other stainless steels like 304 or 316.
SS 347H Hex Bar is commonly used in the aerospace, chemical processing, and power generation industries. It is preferred for its excellent high-temperature resistance, resistance to intergranular corrosion, and stability in harsh environments. Its ability to withstand extreme temperatures and prevent carbide precipitation makes it ideal for critical applications.
Stainless Steel 347H Hex Bars find extensive use in high-temperature and high-pressure settings where strength and corrosion resistance are paramount. They are commonly used for high-temperature fasteners, nuts, bolts, studs, valve components, pressure fittings, and structural connectors. In the petrochemical and power generation sectors, SS 347H hex bars are integral to boiler systems, piping assemblies, heat exchangers, and turbine-related hardware. They are also utilized in refinery systems, gas processing units, and thermal processing equipment, thanks to their excellent weldability and oxidation resistance.
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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