Products Description
Product Specifications
| Item | Inconel 600 | Inconel 625 |
| Standards | ASTM B163/B167/B516/B517/B751/B829;ASME SB163/SB167/SB516/SB517;DIN 17751;ISO 6207 | ASTM B444/B705/B829;ASME SB444;DIN 17752/17753 |
| Steel Grades | UNS N06600 / W.Nr. 2.4816 / NiCr15Fe | UNS N06625 / W.Nr. 2.4856 / NiCr22Mo9Nb |
| Equivalent Standards | AFNOR NC15Fe;BS 3072-3076(NA14);JIS NCF 600;GOST ХН75МБТЮ | AFNOR NC22DNB4M;BS NA21;JIS NCF 625;EN NiCr22Mo9Nb |
| Outer Diameter (OD) | 6–325 mm, customized | 6–325 mm, customized |
| Wall Thickness (WT) | 0.5–40 mm, customized | 0.5–40 mm, customized |
| Length | up to 12 m | up to 12 m |
| Surface Treatment | Annealed & pickled, bright annealed, | Annealed & pickled, bright annealed |
| Production Process | Hot-rolled/Cold-drawn | Hot extrusion/cold drawing |
| Condition | Solution annealed and descaled, or as specified | Solution annealed and descaled, or as specified |
Products advantages
Inconel 600 maintains structural integrity in continuous oxidizing environments at temperatures up to 1095°C, making it highly suitable for applications such as protecting the high-temperature flue-gas-side tube walls of coal-fired boilers and serving as rolls in heat-treatment furnaces. Its work-hardening characteristics facilitate dimensional control during cold-drawing operations, and its excellent weldability makes it ideal for on-site welding and installation at power plants.
Inconel 600 625 Seamless Pipe offers outstanding corrosion resistance. Inconel 600 contains at least 72% nickel, enabling it to withstand a wide range of corrosive environments, while the Inconel 625 alloy contains at least 58% nickel, along with approximately 20–23% chromium and 8–10% molybdenum.
Customized Services
- TORICH offers fixed-length cutting and end-finishing services, including plain, beveled, or threaded ends; bevel angles can be customized according to the ASME B16.25 standard.
- Cold-bending U-tube forming is available, with wall-thinning rates and ovality in the bent sections controlled within ASME specification limits.
- Surface finish options include internal polishing (Ra ≤ 0.8 μm), pickling and passivation, bright annealing, or electropolishing.
- 100% Ultrasonic Testing (UT), Eddy Current Testing (ET), or hydrostatic testing can be performed per project requirements; EN 10204 3.1/3.2 certificates, third-party inspection reports (e.g., TÜV, Lloyd's), and material traceability documentation are provided.
Chemical Composition
| Element | Nickel | Chromium | Iron | Molybdenum | Cobalt | Carbon max | Manganese | Silicon | Others |
| Inconel 600 | ≥ 72.0 | 14.0–17.0 | 6.0–10.0 | – | – | 0.15 | ≤ 1.00 | ≤ 0.50 | Copper ≤ 0.50 |
| Inconel 625 | ≥ 58.0 | 20.0–23.0 | ≤ 5.0 | 8.0–10.0 | ≤ 1.00 | 0.10 | ≤ 0.50 | ≤ 0.50 | Nb+Ta 3.15–4.15 |
Mechanical Properties
| Grade | Tensile Strength (MPa) | Yield Strength (0.2% Offset, MPa) | Elongation (%) |
| Inconel 600 | 550 (min) | 240 (min) | 30 (min) |
| Inconel 625 | 827 (min) | 414 (min) | 30 (min) |
How to choose between Inconel 600 and Inconel 625?
- Inconel 600 is the most cost-effective choice when budget is a concern and the operating conditions are dominated by high-temperature oxidation; its molybdenum- and niobium-free composition results in significantly lower raw material costs compared to Inconel 625.
- Inconel 625 is the preferred choice for service temperatures between 600°C and 800°C where there is a risk of chloride or sulfide corrosion, as its PREN value is approximately double that of Inconel 600.
Possible Alternative Grades
- Inconel 601 (UNS N06601) is a common alternative to Inconel 600; it offers superior oxidation resistance due to its slightly higher chromium content, though it is priced slightly higher than Inconel 600.
- Alloy 825 (UNS N08825) offers good acid resistance and is highly cost-effective, although its maximum continuous service temperature is approximately 870°C-lower than that of Inconel 600.
- Hastelloy C-276 (UNS N10276) exhibits excellent resistance to pitting and crevice corrosion in environments containing high concentrations of chlorides or acids, outperforming Inconel 625 in this regard; however, it has poorer high-temperature oxidation resistance and higher material costs.
application areas
- Inconel 600 is mainly used in nuclear and high-temperature power-generation equipment, including nuclear power equipment, high-temperature heat exchangers, furnace and heating equipment, high-temperature process piping, and steam-related equipment.
- Inconel 625 is mainly used in FGD and corrosive power-generation systems, including flue gas desulfurization equipment, corrosion-resistant heat exchangers, seawater cooling systems, waste heat recovery systems, gas turbine auxiliary systems, and corrosive process piping.
Products Show
Testing Equipment
Factory Equipment
Pickling equipment
Products Package
FAQ
Q: How should one choose between Inconel 600 and 625 seamless pipes for power generation applications?
A: The primary criteria are service temperature and the type of corrosive medium. Alloy 600 suits oxidizing, high-temperature environments up to about 1095°C and is more cost-effective. Alloy 625 is suited for high-stress conditions below 980°C where there is a risk of chloride or sulfide corrosion.
Q: What is the maximum service temperature for Inconel 625 seamless pipes?
A: The maximum continuous service temperature for Alloy 625 in oxidizing environments is approximately 980°C (1800°F); it can withstand higher temperatures during short-term exposure or in non-oxidizing environments. However, in corrosive atmospheres containing sulfur or chlorine, derate the recommended operating temperature based on medium concentration and dew point.
Q: Does Alloy 625 require precipitation hardening?
A: No. The strength of Alloy 625 is derived entirely from the solid-solution strengthening effects of molybdenum and niobium within the nickel-chromium matrix; it achieves high strength and excellent creep resistance without the need for precipitation hardening heat treatment.
Q: What are the differences in welding procedures for the two materials?
A: Alloy 600 has good weldability but is slightly more susceptible to hot cracking than Alloy 625; low heat-input welding processes are recommended. Thanks to the stabilizing effect of niobium, Alloy 625 offers excellent hot-cracking resistance in weld metal and superior welding versatility, making it suitable for on-site installation welding and tube-to-tubesheet welding.
Q: Can Inconel 600 replace 310S stainless steel for boiler superheater applications?
A: Yes, though the cost is higher. Alloy 310S is susceptible to chloride stress corrosion cracking, whereas Inconel 600 significantly extends service life in high-temperature steam and flue gas environments.
Hot Tags: inconel 600 625 seamless pipe, China, suppliers, manufacturers, factory, customized, wholesale, price, OEM, mill, producer, for sale, Inconel 600 pipe
