Inconel, what exactly is it?
Inconel is a corrosion- and oxidation-resistant alloy that excels in high-temperature, high-pressure environments. When Inconel alloy is heated, a thick, stable oxide coating forms on the surface, protecting it from further attack. The strength of Inconel is maintained over a wide temperature range. It achieves high temperature strength through solid solution strengthening or precipitation hardening, depending on the alloy. Inconel is a high-temperature metal that finds widespread use in a variety of applications.
Inconel’s Chemical Formula
| Inconel Grade | Carbon | Manganese | Sulfur | Phosphorus | Chromium | Silicon | Molybdenum | Niobium | Cobalt | Copper | Aluminum | Titanium | Nickel | Iron | Boron |
| Inconel 600 | 0.15 | 1.00 | 0.015 | – | 14.0–17.0 | 0.50 | – | – | – | 0.50 | – | – | 72.0max | 6.0–10.0 | – |
| Inconel 617 | 0.15 | 0.50 | 0.015 | 0.015 | 20.0–24.0 | 0.50 | 8.0–10.0 | – | 10.0–15.0 | 0.50 | 0.8–1.50 | 0.60 | 44.2–56.0 | 3.00max | 0.006 |
| Inconel 625 | 0.10 | 0.50 | 0.015 | 0.015 | 20.0–23.0 | 0.50 | 8.0–10.0 | 3.15–4.15 | 1.00 | – | 0.40 | 0.40 | 58.0max | 5.00max | – |
| Inconel 690 | 0.019 | 0.35 | 0.003 | – | 30.0max | 0.35 | – | – | – | 0.01 | 0.02 | – | 59.5max | 9.20max | – |
| Inconel 718 | 0.08 | 0.35 | 0.015 | 0.015 | 17.0–21.0 | 0.35 | 2.8–3.3 | 4.75–5.5 | 1.00 | 0.2–0.8 | 0.65–1.15 | 0.30 | 50.0–55.0 | balance | 0.006 |
| Inconel X-750 | 0.08 | 1.00 | 0.01 | – | 14.0–17.0 | 0.50 | – | 0.7–1.2 | 1.00 | 0.50 | 0.4–1.0 | 2.25–2.75 | 70.0max | 5.0–9.0 | – |
Inconel Mechanical Characteristics
| Inconel Grade | Tensile Strength | Yield Strength (0.2%Offset) | Density | Melting Point | Elongation |
| Inconel 600 | Psi – 95,000 , MPa – 655 | Psi – 45,000 , MPa – 310 | 8.47 g/cm3 | 1413 °C (2580 °F) | 0.4 |
| Inconel 601 | Psi – 80,000 , MPa – 550 | Psi – 30,000 , MPa – 205 | 8.1 g/cm3 | 1411 °C (2571 °F) | 0.3 |
| Inconel 617 | ≥ 485 MPa | ≥ 275 MPa | 8.3g/cm³ | 1363°C | 0.25 |
| Inconel 625 | Psi – 135,000 , MPa – 930 | Psi – 75,000 , MPa – 517 | 8.4 g/cm3 | 1350 °C (2460 °F) | 0.425 |
| Inconel 690 | ≥ 485 MPa | ≥ 275 MPa | 8.3g/cm³ | 1363°C | 0.25 |
| Inconel 718 | Psi – 135,000 , MPa – 930 | Psi – 70,000 , MPa – 482 | 8.2 g/cm3 | 1350 °C (2460 °F) | 0.45 |
| Inconel 725 | 1137 MPa | 827 MPa | 8.31 g/cm3 | 1271°C-1343 °C | 0.2 |
| Inconel X-750 | 1267 MPa | 868 MPa | 8.28 g/cm3 | 1430°C | 0.25 |
Inconel Equivalent Grade
| Standard | WNR | UNS | AFNOR | JIS | BS | EN |
| Inconel 600 | 2.4816 | N06600 | NC15FE11M | NCF 600 | NA 13 | NiCr15Fe |
| Inconel 601 | 2.4851 | N06601 | NC23FeA | NCF 601 | NA 49 | NiCr23Fe |
| Inconel 617 | 2.4663 | N06617 | ||||
| Inconel 625 | 2.4856 | N06625 | NC22DNB4M | NCF 625 | NA 21 | NiCr22Mo9Nb |
| Inconel 690 | 2.4642 | N06690 | ||||
| Inconel 718 | 2.4668 | N07718 | ||||
| Inconel 725 | – | N07725 | ||||
| Inconel X-750 | 2.4669 | N07750 |
What is Hastelloy, exactly?
Hastelloy is a high-melting-point nickel-molybdenum alloy. It comes in a range of grades, with nickel chromium molybdenum alloys accounting for the majority. Each Hastelloy grade is extremely corrosion resistant, regardless of the application for which it was created. When Hastelloy is alloyed with, it becomes stronger and tougher at higher temperatures, making it perfect for welding applications. It’s easy to shape and put together. They can be forged and cold worked due to their ductility. Hastelloy is a suitable choice for high-temperature applications due to its outstanding resistance to strongly oxidizing and reducing substances. In the chemical and petrochemical sectors, it is widely used for pipes and valves. It’s a fantastic material for heat exchangers, pressure vessels, nuclear and chemical reactors, and more.
Hastelloy Chemical Makeup
| Alloy | Carbon | Cobalt | Chromium | Molybdenum | Vanadium | Tungsten | Aluminium | Copper | Niobium | Titanium | Iron | Nitrogen | Other% |
| B | 0.10max | 1.25max | 0.60max | 28.00max | 0.30max | – | – | – | – | – | 5.50max | Bal | Mn 0.80; Si 0.70 |
| B2 | 0.02max | 1.00max | 1.00max | 26.0-30.0 | – | – | – | – | – | – | 2.00max | Bal | Mn 1.0, Si 0.10 |
| C | 0.07max | 1.25max | 16.00max | 17.00max | 0.30max | 40.0max | – | – | – | – | 5.75max | Bal | Mn 1.0; Si 0.70 |
| C4 | 0.015max | 2.00max | 14.0-18.0 | 14.0-17.0 | – | – | – | – | – | 0.70max | 3.00max | Bal | Mn 1.0 ; Si 0.08 |
| C276 | 0.02max | 2.50max | 14.0-16.5 | 15.0-17.0 | 0.35max | 3.0-4.5 | – | – | – | – | 4.0-7.0 | Bal | Mn 1.0; Si 0.05 |
| G | 0.05max | 2.50max | 21.0-23.5 | 5.5-7.5 | – | 1.00max | – | 1.5-2.5 | 1.7-2.5 | – | 18.0-21.0 | Bal | Mn 1.0-2.0; P0.04; Si 1.0; |
| N | 0.06max | 0.25max | 7.00max | 16.50max | – | 0.20max | – | 0.10max | – | – | 3.00max | Bal | Mn 0.40; Si 0.25; B 0.01 |
| S | 0.02max | 2.00max | 15.50max | 14.50max | 0.60max | 1.00max | 0.20max | – | – | – | 3.00max | Bal | Mn 0.50; Si 0.40; B0.0009; La 0.02 |
| W | 0.06max | 1.25max | 5.00max | 24.50max | – | – | – | – | – | – | 5.50max | Bal | Mn 0.050; Si 0.50 |
| X | 0.10max | 1.50max | 22.0max | 9.00max | – | 0.60max | – | – | – | 18.50max | – | Bal | Mn 0.6; Si 0.60 |
Hastelloy’s Mechanical Characteristics
| Alloy | Tensile Strength | Yield Strength (0.2%Offset) | Density | Melting Point | Elongation |
| Alloy C22 | Psi – 1,00,000 , MPa – 690 | Psi – 45000 , MPa – 310 | 8.69 g/cm3 | 1399 °C (2550 °F) | 0.45 |
| Alloy C276 | Psi – 1,15,000 , MPa – 790 | Psi – 52,000 , MPa – 355 | 8.89 g/cm33 | 1370 °C (2500 °F) | 0.4 |
| Alloy B2 | Psi – 1,15,000 , MPa –760 | Psi – 52,000 , MPa – 350 | 9.2 g/cm3 | 1370 °C (2550 °F) | 0.4 |
| Alloy B3 | Psi – 1,15,000 , MPa –760 | Psi – 52,000 , MPa – 350 | 9.2 g/cm3 | 1370 °C (2550 °F) | 0.4 |
| Alloy C4 | 783 | 365 | 8.64 g/cm3 | 1350-1400 °C | 0.55 |
| Alloy X | 655 MPa | 240 MPa | 8.22 g/cm³ | 1355°C | 0.35 |
Hastelloy’s Equivalent Grade
| Alloy | WNR | UNS | GOST | JIS | EN |
| C22 | 2.4602 | N06022 | – | NW 6022 | NiCr21Mo14W |
| C276 | 2.4819 | N10276 | ХН65МВУ | NW 0276 | NiMo16Cr15W |
| B2 | 2.4617 | N10665 | – | – | – |
| B3 | 2.46 | N10675 | – | – | – |
| C4 | 2.461 | N06455 | – | – | – |
| C-22 | – | N07022 | – | – | – |
| C2000 | 2.4675 | N06200 | – | – | – |
| X | 2.4665 | N06002 | – | – | – |
Read More :
Hastelloy VS Monel : Hastelloy is one of the most corrosion-resistant nickel-based steel alloys available. Monel is largely made of nickel and copper (52-67 percent), with minor amounts of silicon, manganese, iron, and carbon, Read more.
Inconel 601 Tubes – What Are They? :
Nickel, chromium, and iron-containing alloys make up Inconel 601 Tubes. These items are beneficial in general-purpose engineering and are designed for applications that demand heat and corrosion resistance. Inconel 601 Tubes can also be used in sour-water environments, Read More.
