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Stainless Steel 347 Round Bar is an austenitic stainless steel alloy known for its excellent resistance to intergranular corrosion and high-temperature oxidation. It contains niobium, which stabilizes the material against carbide precipitation during welding and heat exposure. Stainless Steel 347 Round Bar maintains its mechanical strength and toughness even in elevated temperature environments. It is widely used in chemical processing, aerospace, and power generation industries. This alloy provides exceptional durability and reliability where both heat and corrosion resistance are essential.
The chemical composition of Stainless Steel 347 Round Bar includes chromium, nickel, and niobium, which together enhance its strength, toughness, and resistance to oxidation. The niobium addition also improves weldability and prevents sensitization that can occur during thermal cycling. Stainless Steel 347 Round Bar performs exceptionally well in environments containing acids, steam, and high temperatures. It offers better creep and stress rupture resistance than standard 304 stainless steel. This makes it particularly suitable for applications involving continuous high-heat exposure.
Stainless Steel 347 Round Bar exhibits excellent resistance to corrosion in oxidizing and moderately reducing environments. It is especially effective in environments where exposure to sulfur-bearing gases or high-temperature steam occurs. The alloy retains its mechanical properties at temperatures up to 870°C (1600°F). Stainless Steel 347 Round Bar is often used in furnace components, heat exchangers, and high-temperature piping systems. Its stable microstructure ensures long-term service life with minimal maintenance. This makes it a dependable choice for critical applications.
Due to its stabilized composition, Stainless Steel 347 Round Bar is highly resistant to intergranular attack after welding, making it ideal for components requiring extensive fabrication. It can be easily machined, welded, and formed using standard techniques. The alloy’s high strength and oxidation resistance make it suitable for aerospace engine parts, exhaust manifolds, and boiler tubes. Stainless Steel 347 Round Bar maintains excellent structural integrity under both mechanical and thermal stress. Its superior performance under cyclic heating conditions enhances its industrial value.
The mechanical strength of Stainless Steel 347 Round Bar is superior to that of many standard stainless steels, offering a high yield and tensile strength. It demonstrates excellent creep resistance, making it ideal for use in heat exchangers and pressure vessels. The alloy also resists scaling and surface degradation even after prolonged heat exposure. Stainless Steel 347 Round Bar’s smooth surface finish and dimensional accuracy allow it to be used in precision-engineered systems. These properties contribute to its reliability in demanding environments.
Applications of Stainless Steel 347 Round Bar extend across chemical, petrochemical, aerospace, and power generation industries. It is commonly used in superheaters, furnace parts, and high-temperature gaskets. The alloy’s ability to withstand oxidation and corrosion at elevated temperatures makes it suitable for long-term use in harsh environments. Stainless Steel 347 Round Bar also provides excellent resistance to chloride stress corrosion cracking. Its versatility and endurance make it one of the preferred materials for industrial engineering applications.
In conclusion, Stainless Steel 347 Round Bar is a premium-grade alloy that combines excellent mechanical strength with outstanding heat and corrosion resistance. Its niobium-stabilized composition ensures superior performance during welding and thermal processing. Stainless Steel 347 Round Bar is a durable, versatile, and cost-effective solution for high-temperature and high-pressure operations. It offers long-lasting performance, reduced maintenance, and high reliability in critical environments. Overall, this alloy remains a trusted choice for industries requiring strength, stability, and corrosion resistance.
Specification Table
| Property | Specification | Remarks |
|---|---|---|
| Grade | SS 347 / UNS S34700 | Niobium-stabilized austenitic stainless steel |
| Standards | ASTM A276 / ASME SA276 | Internationally recognized standard for stainless steel bars |
| Form | Round Bar / Rod | Available in hot-rolled, cold-drawn, and polished finishes |
| Diameter Range | 3 mm – 200 mm (custom sizes available) | Depending on manufacturer and stock |
| Length | 1 m – 6 m (custom cut-to-length available) | Standard length, or as per customer requirement |
| Finish | Hot Rolled, Annealed & Pickled, Cold Drawn, Bright Polished | Surface finish options to suit application |
| Applications | Heat exchangers, furnace components, chemical processing, welded fabrications | High-temperature and corrosion-resistant environments |
| Corrosion Resistance | Excellent intergranular corrosion resistance | Stabilized with Nb/Ti to prevent sensitization |
| Mechanical Properties | Refer to Mechanical Properties Table | Tensile strength, yield strength, elongation, hardness |
| Chemical Composition | Refer to Chemical Composition Table | Typical % of C, Cr, Ni, Mn, Si, Nb, P, S, Fe |
Chemical Composition (Typical ranges for SS347)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | Typical Composition (%) | Remarks |
|---|---|---|
| Carbon (C) | ≤ 0.08 | Low carbon for corrosion resistance |
| Chromium (Cr) | 17.0 – 19.0 | Provides corrosion resistance |
| Nickel (Ni) | 9.0 – 13.0 | Austenite stabilizer |
| Manganese (Mn) | ≤ 2.0 | Deoxidizer, strengthens steel |
| Silicon (Si) | ≤ 1.0 | Improves oxidation resistance |
| Niobium + Tantalum (Nb + Ta) | ≥ 10 × C, max 0.75 | Stabilizes against intergranular corrosion |
| Phosphorus (P) | ≤ 0.045 | Impurity limit |
| Sulfur (S) | ≤ 0.03 | Impurity limit |
| Iron (Fe) | Balance | Main matrix element |
Mechanical Properties (Typical)
| Property | Typical Value | Remarks |
|---|---|---|
| Tensile Strength (MPa) | 515 – 760 | Depends on diameter and finish (hot-rolled, cold-drawn) |
| Yield Strength (0.2% offset, MPa) | 205 – 310 | Minimum yield for structural applications |
| Elongation (%) | 40 – 50 | Measured over 50 mm gauge length |
| Hardness (HRB) | 70 – 90 | Rockwell B scale, typical cold-worked condition |
| Hardness (HV) | 150 – 200 | Vickers hardness for reference |
| Density (g/cm³) | 7.9 | Typical austenitic stainless steel density |
| Modulus of Elasticity (GPa) | 193 – 200 | Young’s modulus |
| Operating Temperature | Up to 870°C (1600°F) | Continuous service temperature in oxidizing atmosphere |
Equivalent Grades
| Standard / Country | Equivalent Grade | Remarks |
|---|---|---|
| ASTM / ASME (USA) | 347 / S34700 | Niobium-stabilized austenitic stainless steel |
| EN / BS (Europe / UK) | 1.4550 / X6CrNiNb17-12 | European designation for SS 347 |
| JIS (Japan) | SUS 347 | Japanese Industrial Standard equivalent |
| DIN (Germany) | 1.4550 | DIN equivalent for SS 347 |
| UNI (Italy) | 347 / FeCr19Ni12Nb | Italian standard equivalent |
| AFNOR (France) | Z2CND17-12 | French standard equivalent |
| GB / China | 0Cr18Ni12Nb | Chinese standard equivalent |
Dimension & Weight Chart (Selected common sizes)
Below is a representative chart showing outside diameter, wall thickness, inside diameter, cross-sectional area of metal and calculated weight per metre (kg/m). Values are calculated using density = 7.93 g/cm³ and are for guidance — use actual MTC values for procurement & engineering.
| Diameter (mm) | Weight per Meter (kg/m) | Remarks |
|---|---|---|
| 6 | 0.22 | Small rod, suitable for precision applications |
| 8 | 0.39 | Light-duty applications |
| 10 | 0.62 | Common for general use |
| 12 | 0.89 | Structural and medium-duty applications |
| 16 | 1.58 | Heavier bars, industrial use |
| 20 | 2.47 | Standard bar size for fabrication |
| 25 | 3.85 | Large round bars, heavy-duty use |
| 32 | 6.32 | Heavy industrial components |
| 40 | 9.87 | High-strength heavy bars |
| 50 | 15.4 | Large diameter structural applications |
| 60 | 22.0 | Extra-large bars, industrial machinery |
| 80 | 39.5 | Very heavy-duty applications |
| 100 | 61.6 | Extra heavy industrial round bars |
| 120 | 88.3 | Large diameter stock for specialized applications |
| 150 | 138.9 | Very large industrial bars |
| 200 | 197.0 | Maximum diameter, heavy industrial use |
Types Of 347 Round Bars and Tubes
Stainless Steel Round Bar
Monel 400 K400 Round Bar
Hastelloy Round Bar
Inconel 600 Round Bar
Nickel Alloy Round Bar
Super Duplex Round Bar
Monel K500 Round Bar
Inconel 625 Round Bar
Frequently Asked Questions (FAQ)
What is Stainless Steel 347?
Stainless Steel 347 (SS 347) is a niobium-stabilized austenitic stainless steel designed to resist intergranular corrosion. It offers excellent high-temperature strength and corrosion resistance in oxidizing environments.
What are the common applications of SS 347 round bars?
Common applications include furnace components, heat exchangers, chemical processing equipment, welded fabrications, and other high-temperature or corrosive environments.
What standards does Stainless Steel 347 conform to?
SS 347 typically conforms to ASTM A276 / ASME SA276 standards for stainless steel bars and rods. It also has equivalent international standards such as EN 1.4550, SUS 347 (JIS), and 0Cr18Ni12Nb (GB).
What forms and finishes are available?
SS 347 round bars are available in hot-rolled, cold-drawn, annealed & pickled, and bright polished finishes. Lengths can often be customized based on customer requirements.
What diameters are available for SS 347 round bars?
Diameters typically range from 3 mm to 200 mm, with custom sizes available depending on manufacturer stock and customer requirements.
What is the chemical composition of Stainless Steel 347?
SS 347 contains 17–19% Chromium, 9–13% Nickel, ≤0.08% Carbon, ≤2% Manganese, ≤1% Silicon, Nb/Ta ≥10×C (max 0.75%), P ≤0.045%, S ≤0.03%, and the balance is Iron (Fe).
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