Stainless Steel 347H Bars are stabilized austenitic stainless steel bars for elevated temperatures used for high creep strength and thermal endurance. Provided by Andre Stainless in Pulau Ujong, Singapore, 347H contains higher carbon content than SS 347, with better performance under continuous high temperature use. Columbium (niobium) additions in 347H resist intergranular corrosion following welding or heat treatment. These bars find extensive application in petrochemical, power generation, and heat treatment processes. Andre Stainless supplies these bars to ASTM A276 and A479 specifications, ensuring high-quality surface finishes, consistent mechanical properties, and traceable documentation for pressure-containing and thermally cycled equipment.
SS 347H contains ~17–20% chromium, 9–13% nickel, ~0.04–0.10% carbon, and columbium (at least 10x carbon content). This elevated carbon enhances high-temperature strength, creep resistance, and stability under thermal stress. It provides tensile strength of ~550 MPa, yield strength ~240 MPa, elongation ~35%, and hardness of ~150 HB. The alloy is non-magnetic when in the annealed state and resists oxidation to 870°C. It possesses weldability and mechanical properties after being subjected to high heat, making it suited for cyclic heating conditions. 347H has superior toughness and dimensional stability when forming and machining.
| Specifications | ASTM A276 / ASME SA276 |
| Dimensions | ASTM, ASME |
| Range | 3.17 MM TO 350 MM DIA |
| Diameter | 25mm to 152mm |
| Length | 1 to 6 Meters, Custom Cut Length |
| Finish | Bright, Polish & Black |
| Form | Round, Square, Hex (A/F), Rectangle, Wire (Coil Form), Wiremesh, Billet, Ingot, Forging |
| Condition | Cold Drawn & Polished Cold Drawn, Centreless Ground & Polished |
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | |
| 347H | min. | 0.04 | – | – | – | – | 17.0 | 3.00 | 9.0 | – |
| max. | 0.10 | 2.0 | 1.00 | 0.045 | 0.030 | 19.0 | 4.00 | 13.0 | – | |
| Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness | |
| Rockwell B (HR B) max | Brinell (HB) max | ||||
| 347H | 515 | 205 | 40 | 92 | 201 |
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Stainless Steel 347H Round Bars offer excellent corrosion resistance. Available in sizes ranging from 3mm to 200mm in diameter, these bars are ideal for applications in high-temperature environments due to their stability and durability.
These bars provide outstanding resistance to corrosion and oxidation. Stainless Steel 347H Flat Bars come in thicknesses from 1mm to 50mm and widths from 10mm to 500mm, making them suitable for a variety of industrial uses.
Stainless Steel 347H Square Bars are perfect for high-stress applications. Available in sizes from 5mm to 100mm, they combine excellent mechanical properties with superior resistance to intergranular corrosion.
These bars are highly resistant to corrosion and scaling. Stainless Steel 347H Rectangular Bars are available in thicknesses from 1mm to 50mm and widths from 10mm to 500mm, ideal for structural and mechanical applications.
Stainless Steel 347H Hexagonal Bars offer excellent resistance to high temperatures and corrosion. Available in sizes ranging from 6mm to 75mm, they are widely used in the manufacturing of fasteners and other high-strength components.
These corrosion-resistant bars are available in a range of sizes. Stainless Steel 347H T-Bars provide excellent mechanical strength and are ideal for structural applications requiring high resistance to oxidation and corrosion.
Stainless Steel 347H Bars are commonly employed in high temperature boiler tubes, heat exchangers, pressure vessels, and furnace parts. Due to their resistance to intergranular corrosion and thermal fatigue, they are excellent for use in petrochemical refineries and power plant structures. In chemical processing and aerospace, the 347H is used for superheaters, manifold components, and high-pressure piping. The higher content of carbon and columbium provides long-term durability in elevated temperature service. These bars are also appropriate for welded structures that need resistance to sensitization and creep deformation, offering structural integrity and long life under harsh operational conditions.
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