What are the key properties of stainless steel 316H furnace tubes?
Stainless Steel 316H Furnace Tubes possess several key properties that make them highly suitable for high-temperature applications. First and foremost, stainless steel 316H exhibits excellent corrosion resistance, particularly in environments with acids, alkalis, and chlorides. This corrosion resistance is attributed to the high chromium content (16-18%) and molybdenum (2-3%) addition in the alloy composition. Furthermore, stainless steel 316H offers superior strength and durability, allowing it to withstand high temperatures and mechanical stress.
Its high carbon content (0.04-0.10%) enhances the material's tensile strength and hardness, making it resistant to creep and oxidation at elevated temperatures. Additionally, stainless steel 316H has good weldability, facilitating ease of fabrication and installation. The key properties of stainless steel 316H furnace tubes, including corrosion resistance, high-temperature strength, and weldability, make them reliable for demanding furnace applications where durability and performance are paramount.
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How does stainless steel 316H compare to other grades of stainless steel for furnace tube applications?
Compared to other grades of stainless steel used in furnace tube applications, stainless steel 316H offers distinct advantages. One of the primary differentiating factors is its higher carbon content, which improves high-temperature strength and creep resistance. That makes stainless steel 316H better suited for prolonged exposure to elevated temperatures than lower carbon grades like 304 or 316.
Additionally, Stainless Steel 316H exhibits superior corrosion resistance due to its higher chromium and molybdenum content, making it more resistant to corrosive environments containing acids, alkalis, and chlorides. It also offers excellent weldability, allowing for efficient fabrication and assembly of furnace tube systems. However, it's important to consider specific application requirements when choosing stainless steel grades, as temperature, corrosive agents, and mechanical stresses may vary. Consulting with materials engineers or experts in the field can help determine the most suitable stainless steel grade for a particular furnace tube application.
| Specifications | ASTM, ASME, AISI |
| Outer Diameters | 6mm – 300 mm OD |
| Thickness | 1.0mm to 40mm |
| Length | 5.8m, 6, Custom Lengths |
| Finish | Annealed & Pickled, Bright Annealing, Polished |
| Test Certificate | EN 10204 3.1 |
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| STANDARD | WERKSTOFF NR. | UNS | JIS | AFNOR | BS | GOST | EN |
| SS 316H | – | S31609 | – | – | – | – | – |
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Selection of Materials
The materials used to make furnace tubes are typically resistant to corrosion and high temperatures. Stainless steel, alloy steel, and nickel-based alloys are common materials.
Tube Formation
The creation of the tubes is the first step in the procedure. This can be accomplished using a variety of techniques, including cold drawing, welded tube manufacture, and seamless tube extrusion. Due to their homogeneity and lack of seams that could compromise the structure, seamless tubes are frequently used for high-temperature applications.
Heating and Annealing
The tubes are subsequently put through heat-treating procedures, such as annealing. In order to reduce internal tensions, increase ductility, and improve the material's general qualities, annealing entails heating the tubes to a certain temperature and then gradually cooling them.
Cutting and Sizing
The tubes are sized and cut to the required lengths in accordance with the application's requirements. In order to ensure a perfect fit inside the furnace or heat exchanger, precise cutting and sizing are essential.
Surface Treatment
Depending on the application, the tubes may also go through passivation or pickling as additional surface treatments. By removing oxides, scale, and other contaminants from the surface, these processes increase corrosion resistance.
Quality Control
Quality control procedures are used all through the manufacturing process to guarantee that the tubes meet the necessary requirements. This entails a variety of tests, including visual inspections, non-destructive testing techniques like ultrasonic or radiographic testing, and dimensional checks.
Final Heat Treatment (Optional)
To achieve the appropriate mechanical and metallurgical qualities, the tubes may go through a final heat treatment procedure, such as stress relieving or solution annealing, depending on the material and desired properties.
Finishing
The tubes might undergo further finishing processes such as polishing, buffing, or coating to meet specific application requirements or aesthetic preferences.
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| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | |
| 316H | Min | 0.04 | 0.04 | 0 | – | – | 16.0 | 2.00 | 10.0 | – |
| max | 0.10 | 0.10 | 0.75 | 0.045 | 0.03 | 18.0 | 3.00 | 14.0 | – |
| Grade | Density (kg/m3) |
Elastic Modulus (GPa) |
Mean Co-eff of Thermal Expansion (µm/m/°C) | Thermal Conductivity (W/m.K) |
Specific Heat 0-100°C (J/kg.K) |
Elec Resistivity (nΩ.m) |
|||
| 0-100°C | 0-315°C | 0-538°C | At 100°C | At 500°C | |||||
| 316H | 8000 | 193 | 15.9 | 16.2 | 17.5 | 16.3 | 21.5 | 500 | 740 |
| Positive Material Identification – PMI Testing | Hydrostatic Test |
| Chemical Analysis – Spectro Analysis | Hydrogen-Induced Cracking (HIC) Test |
| Mechanical Testing Such as Tensile, Elongation, Reduction of Area | Sulfide Stress Corrosion Cracking (SSC), NACE TM 0177 |
| Micro Test | Radiography Test |
| Macro Test | Dye Penetrant Test (DP Test) |
| Hardness Test | Ultra Sonic Test (UT) |
| Pitting Resistance Test | Eddy Current Testing |
| Intergranular Corrosion (IGC) Test | Impact Test |
| Flaring Test | Bend Test |
| Flattening Test |
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