The difference between Inconel 601 and 625 round bars
The difference between Inconel 601 and 625 round bars
Inconel 601 rods exhibit excellent performance in high-temperature oxidation (thanks to the aluminum content), while Inconel 625 rods possess superior overall corrosion resistance (especially against pitting and crevice corrosion) and higher high-temperature strength (due to the molybdenum and niobium content). Therefore, 601 alloy rods are more suitable for furnace components, while 625 rods are ideal for marine/chemical equipment applications, despite 601 rods having a slightly higher melting point and good resistance to carburization.
What is the difference between Inconel 625 and 601?
Inconel 601 has a melting point of 2467°F (1350°C), while Inconel 625 has a melting point of 2375°F (1310°C). In terms of tensile strength at room temperature, Inconel 601 ranges from 590-930 MPa, while Inconel 625 has a slightly higher strength of 690-895 MPa.
Specification of Inconel 601/ 625 Round bar
| Specification | ASTM B166 / ASTM SB166 |
| Dimension Standard | EN, DIN, JIS, ASTM, BS, ASME, AISI |
| Range | 3.17 MM TO 350 MM DIA |
| Size | Round Bar Size: 3mm~ 800mm Square Bar Size: 4mm* 4mm ~100mm* 100mm Flat Bar Size: 2mm ~ 100mm Hex Bar Size: 2mm ~ 100mm |
| Thickness | 50 mm to 6000 mm Long |
| Length | 1 To 6 Meters, Custom Cut Length |
| Finish | Black, Bright Polished, Rough Turned, NO.4 Finish, Matt Finish, BA Finish |
Equivalent Grades of Inconel 601/ 625 Round bar/ Wire
| STANDARD | UNS | WERKSTOFF NR. | AFNOR | GOST | OR | BS | JIS | EN |
| Inconel 601 | N06601 | 2.4851 | NC23FeA | XH60BT | ЭИ868 | NA 49 | NCF 601 | NiCr23Fe |
| Inconel 625 | N06625 | 2.4856 | NC22DNB4M | ХН75МБТЮ | ЭИ602 | NA 21 | NCF 625 | NiCr22Mo9Nb |
Chemical Composition of Inconel 601/ 625 Round bar/ Wire
| Grade | Ni | Fe | C | Mn | Si | Cu | Cr | S | Mo | Co | Al | Ti | Nb |
| 601 | 58.0 – 63.0 | Balance | 0.10 max | 1.0 max | 0.50 max | 1.0 max | 21.0 – 25.0 | 0.015 max | 8.0-10.0 | - | 1.0 – 1.7 | - | - |
| 625 | 58.0 max | 5.0 max | 0.10 max | 0.50 max | 0.50 max | - | 20.0 - 23.0 | 0.015 max | 8.0 - 10.0 | 1.0 max | 0.40 max | 0.40 max | 3.15 - 4.15 |
Mechanical Properties of Inconel 601/ 625 Round bar/ Wire
| Grade | Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 601 | 8.1 g/cm3 | 1411 °C (2571 °F) | Psi – 80,000 , MPa – 550 | Psi – 30,000 , MPa – 205 | 30 % |
| 625 | 8.4 g/cm3 | 1350 °C (2460 °F) | Psi – 1,35,000 , MPa – 930 | Psi – 75,000 , MPa – 517 | 42.5 % |
Size Of Inconel 601/ 625 Round bar
| Metric | US Bar | ASTM/ Canadian | Japanese | ||||
| Bar Size | Diam. (mm) | Bar Size | Diam. (Inch) | Bar Size | Diam. (mm2) | Bar Size | Diam. (mm) |
| 5 | 5 | #2 | 0.250 | 10M | 100 | 6 | 6 |
| 5.5 | 5.5 | #3 | 0.375 | 15M | 200 | 10 | 10 |
| 6 | 6 | #4 | 0.500 | 20M | 300 | 13 | 13 |
| 7 | 7 | #5 | 0.600 | 25M | 500 | 16 | 16 |
| 8 | 8 | #6 | 0.750 | 30M | 700 | 19 | 19 |
| 9 | 9 | #7 | 0.875 | 35M | 1000 | 22 | 22 |
| 10 | 10 | #8 | 1.000 | 45M | 1500 | 25 | 25 |
| 11 | 11 | #9 | 1.125 | 55M | 2500 | 29 | 29 |
| 12 | 12 | #10 | 1.250 | 32 | 32 | ||
| 14 | 14 | #11 | 1.375 | 35 | 35 | ||
| 16 | 16 | #12 | 1.500 | 38 | 38 | ||
| 18 | 18 | #13 | 1.600 | 41 | 41 | ||
| 20 | 20 | #14 | 1.750 | 44 | 44 | ||
| 22 | 22 | #15 | 1.875 | 48 | 48 | ||
| 25 | 25 | #16 | 2.000 | 51 | 51 | ||
| 28 | 28 | #18 | 2.250 | 57 | 57 | ||
| 32 | 32 | ||||||
| 36 | 36 | ||||||
| 40 | 40 | ||||||
| 44 | 44 | ||||||
| 50 | 50 | ||||||
How to Choose
If you need an alloy for furnace components, heat exchangers, and applications requiring excellent oxidation and carburization resistance at extremely high temperatures, choose Alloy 601.
If you need an alloy for marine hardware, chemical equipment, or aerospace components, and require maximum strength and resistance to pitting, crevice corrosion, and general corrosion, choose Alloy 625.
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 is a supplier of inconel 601 alloy, offering a wide range of products including: seamless pipe (sizes: 4-219 mm; thickness: 0.5-20 mm); welded pipe (sizes: 5.0-1219.2 mm; thickness: 0.5-20 mm); plates (thickness: 0.1 to 100 mm; width: 10-2500 mm); strips; alloy round bars (diameter: 3-800 mm); flat bars (thickness: 2-100 mm; width: 10-500 mm); hexagonal bars (size: 2-100 mm); wire rods; and extruded profiles. We collaborate with steel mills to provide our customers with inconel 601 alloy products that meet or exceed numerous leading industry standards, including ASTM, ASME, SAE, AMS, ISO, DIN, EN, and BS standards.
Gnee Steel stocks and sells inconel 601, pipes, plates, strips, round bars, flat bars, forged billets, hexagonal steel, wire rods, and extruded profiles. Please feel free to contact us at ss@gneesteel.com for a quote.
