Stainless Steel 348 Bars are stabilized austenitic stainless steel bars with excellent corrosion resistance, elevated temperature strength, and very good weldability. Provided by Andre Stainless in Singapore, 348 bars have columbium (niobium) content to avert carbide precipitation on welding and thermal cycling. These characteristics make them suited for applications in continuous heating and cooling at high temperatures. Resistant to intergranular corrosion with superior mechanical stability, these bars are applied to petrochemical, nuclear, and aerospace industries. Andre Stainless supplies 348 bars to ASTM A276 and A479 specifications, offering materials with accurate dimensional control, smooth finish, and full traceability for stringent engineering requirements.
SS 348 has ~17–20% chromium, 9–13% nickel, ≤0.08% carbon, and niobium/tantalum stabilizers (~10x carbon content). It has tensile strength of ~550 MPa, yield strength ~240 MPa, elongation ~35%, and Brinell hardness ~150. Its niobium content avoids sensitization, providing excellent intergranular corrosion resistance following welding. The alloy retains its structure and corrosion resistance to 870°C. SS 348 is non-magnetic in the annealed state and has good oxidation and creep properties. It finds use where thermal and mechanical integrity should be preserved without carbide precipitation during manufacturing.
Element | Content (%) |
Iron, Fe | 60 |
Chromium, Cr | 23 |
Nickel, Ni | 14 |
Manganese, Mn | 2 |
Silicon, Si | 1 |
Carbon, C | 0.20 |
Phosphorous, P | 0.045 |
Sulfur, S | 0.030 |
Properties | Metric | Imperial |
Tensile strength | 620 MPa | 89900 psi |
Yield strength (@ strain 0.200%) | 310 MPa | 45000 psi |
Izod impact | 120 – 165 J | 88.5 – 122 ft-lb |
Shear modulus (typical for steel) | 77 GPa | 11200 ksi |
Elastic modulus | 200 GPa | 29008 ksi |
Poisson’s ratio | 0.27-0.30 | 0.27-0.30 |
Elongation at break (in 50 mm) | 45% | 45% |
Hardness, Brinell | 147 | 147 |
Hardness, Rockwell B | 85 | 85 |
Hardness, Vickers (converted from Rockwell B hardness) | 169 | 169 |
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Corrosion-resistant and designed for high-temperature stability, Stainless Steel 348 Round Bars are available in diameters from 0.5″ to 12″. Ideal for use in aerospace components and chemical processing equipment where strength and durability are crucial.
Stainless Steel 348 Flat Bars offer exceptional resistance to high temperatures, available in thicknesses from 0.25″ to 6″ and widths up to 12″. Perfect for structural and industrial applications requiring durability and resistance to oxidation.
Corrosion-resistant Stainless Steel 348 Square Bars come in sizes from 0.5″ to 6″ on each side. These bars are designed for applications where high strength and resistance to extreme temperatures are necessary.
Offering excellent high-temperature resistance, Stainless Steel 348 Rectangular Bars are available in dimensions from 0.5″ x 1″ to 6″ x 12″. Suitable for heavy-duty applications requiring durability and resistance to oxidation.
Stainless Steel 348 Hexagonal Bars provide superior resistance to high temperatures, available in sizes from 0.5″ to 4″ across flats. Ideal for aerospace and chemical industries where robust performance is required.
Corrosion-resistant Stainless Steel 348 T-Bars come in dimensions from 0.5″ x 0.5″ to 6″ x 6″. Suitable for structural support and high-temperature applications where strength and durability are essential.
Stainless Steel 348 Bars are well-suited for heat exchanger tubes, nuclear reactor parts, high-temperature piping, exhaust manifolds, and welded pressure vessels. Their intergranular corrosion resistance is effective for parts subjected to cyclic thermal operation and continuous heating. Aerospace and defense sectors employ 348 for structural components demanding stability at high stress and temperature. Chemical processing uses it in reactor linings, storage tanks, and flanges. Welded components are enhanced by the resistance of the alloy to weld decay, providing mechanical soundness in use. SS 348 is also applied in furnace components and process piping systems.
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