Nickel alloy 600 tubing offers excellent high-temperature oxidation resistance and corrosion resistance, but due to the addition of molybdenum (Mo) and niobium (Nb), alloy 625 tubing surpasses it in strength and resistance to pitting and crevice corrosion. Therefore, alloy 625 is more suitable for demanding chemical/aerospace applications, while alloy 600 is better suited for furnace/heat exchanger environments. The key difference lies in the alloy composition: compared to alloy 600's higher nickel/chromium content and absence of molybdenum/niobium, alloy 625 has a higher chromium content, contains significant amounts of molybdenum/niobium, and has a lower nickel content, making it a stronger and more corrosion-resistant superalloy.
Are Alloy 600 and Inconel 600 the same material?
Nickel alloy 600, also sold under the brand name Inconel 600, is a unique nickel-chromium alloy known for its oxidation resistance at high temperatures. It is widely used in a variety of applications, from cryogenic environments to high temperatures up to 2000°F (1093°C).
Inconel 600 tubing is a pipe material made from a high-performance nickel-chromium-iron alloy (Inconel 600), specifically designed for transporting fluids in extreme high-temperature environments up to approximately 1150°C and in highly corrosive media (such as chlorides, caustic alkalis, and various acids and bases). Its core advantages lie in its exceptional high-temperature strength retention, excellent oxidation resistance, and resistance to chloride stress corrosion cracking. It is primarily used in critical applications such as steam generator heat exchanger tubes in nuclear power plants, petrochemical cracking furnace tubes, radiant tubes in heat treatment equipment, and pipelines in demanding chemical processes. It is a top-tier, reliable piping solution for severe conditions where stainless steel is insufficient, but at a significantly higher cost.
Inconel 625 tubing is a nickel-chromium-based high-temperature alloy pipe strengthened with molybdenum and niobium. Its core advantages are its comprehensive and superior corrosion resistance and high strength, effectively resisting pitting corrosion, crevice corrosion, chloride stress corrosion cracking, and oxidation and reducing acid media. It also possesses excellent high-temperature strength (up to approximately 980°C) and creep resistance. It is specifically designed to provide reliable solutions for applications in marine engineering, demanding chemical processes, flue gas desulfurization systems, and aerospace, where pipelines need to transport media in extremely corrosive and high-temperature, high-pressure environments. It is a top-tier piping option with broader and more robust performance than Inconel 600 tubing.
Standard Specification For Inconel 600 / 625 Pipes & Tubes
Specifications : ASTM B167, B163, B516, B517, B704, B705 / ASME SB167, SB163, SB516, SB517, SB704, SB705
Dimensions : ASTM, ASME and API
Size Range : 15"NB – 150"NB
Outer Diameter : 6.35 mm OD upto 254 mm OD in 0.6 TO 20 mm thickness.
Schedule : SCH 10, SCH20, SCH30, SCH40, STD, SCH60, XS, SCH80, SCH120, SCH140, SCH160, XXS
Type : Seamless / ERW / Welded / Fabricated / LSAW Pipes
Length : Single Random, Double Random & Cut Length
Form : Round Pipes/Tubes, Square Pipes/Tubes, Pipe/Tubes, Coiled Tubes, "U" Shape, Pan Cake Coils, Hydraulic Tube
Grade : 600, 625
Inconel 600 / 625 Tube Equivalent Grades
| STANDARD | WERKSTOFF NR. | UNS | JIS | BS | GOST | AFNOR | EN |
| Inconel 600 | 2.4668 | N06600 | NCF 600 | NA 13 | МНЖМц 28-2,5-1,5 | NC15FE11M | NiCr15Fe |
| Inconel 625 | 2.4856 | N06625 | NCF 625 | NA 21 | ХН75МБТЮ | NC22DNB4M | NiCr22Mo9Nb |
Differnt Types of Inconel 600 / 625 Pipes
Differnt Types of Inconel 600 / 625 Pipes
Inconel 600 Seamless Pipe
ASTM B517 Inconel 625 Pipe
Alloy 718 Welded Pipe
Inconel Seamless Pipe
Inconel 600 Seamless Pipe
ASTM B516 Inconel Alloy 601 Welded Pipe
Inconel 600 Cold Rolled Coil
2.4668 Inconel Pipe
Inconel 718 Cold Rolled Pipe
Inconel 600 Hot Rolled Pipe
ASME SB167 Inconel 600 Seamless Pipe
Inconel N06600 Seamless Pipe
Alloy UNS N06625 Tubing
Inconel 2.4856 Welded Pipe
Chemical Composition of Inconel 600 / 625 Pipe
| Grade | C | Mn | Si | S | Cu | Fe | Ni | Cr |
| Alloy 600 | 0.15 max | 1.00 max | 0.50 max | 0.015max | 0.50 max | 6.00 – 10.00 | 72.00 min | 14.00 – 17.00 |
| Alloy 625 | 0.10 max | 0.50 max | 0.50 max | 0.015 max | - | 5.0 max | 58.0 min | 20.0 - 23.0 |
Mechanical Properties of Inconel 600 / 625 Tube
| Element | Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| Alloy 600 | 8.47 g/cm3 | 1413 °C (2580 °F) | Psi – 95,000 , MPa – 655 | Psi – 45,000 , MPa – 310 | 40 % |
| Alloy 625 | 8.4 g/cm3 | 1350 °C (2460 °F) | Psi – 1,35,000 , MPa – 930 | Psi – 75,000 , MPa – 517 | 42.5 % |
Why Choose Gnee as Your Nickel-Based Alloy Supplier
✅ Over 18 years of export experience, products sold to more than 80 countries
✅ Certified by ISO, SGS, and BV
✅ Global inventory of Inconel, Hastelloy, Incoloy, and Monel alloy tubing, plates, and bars
✅ Custom processing services available – including cutting, polishing, CNC machining, and packaging
✅ Fast delivery within 7-15 days, supported by global logistics partners
📦 Packaging and Shipping
All stainless steel products are packaged using the following methods:
Wooden pallets or crates
Moisture-proof packaging
Labels with furnace number, standard, and size labels
Shipped worldwide by sea, air, or express
Gnee Steel also supplies custom Inconel 600 products in various sizes and specifications. Please send us your drawings for a quote!
