Inconel (nickel-chromium) and Incoloy (nickel-iron-chromium) alloys for furnace and chemical duty, from heat-treatment fixtures to gas-turbine hot sections.
Inconel grades are nickel-chromium superalloys: the chromium oxide scale they form at temperature protects against oxidation and carburisation in furnaces and hot gas streams, while solid-solution (600, 601, 625) or precipitation strengthening (718, X-750) carries the load.
Incoloy grades replace part of the nickel with iron — an economical route to high-temperature oxidation and carburisation resistance. 800/800H/800HT serve furnace and steam-hydrocarbon service to about 1100 °C, and 825 adds molybdenum and copper for chemical-corrosion duty including sulphuric and phosphoric acids.
The grades below are the ones most often asked for. Each grade stays on this page — the material-first way to browse.
UNS N06600 EN / W.Nr. 2.4816
Solid-solution nickel-chromium alloy for furnace muffles, heat-treatment fixtures and chemical equipment. Resists oxidation to about 1150 °C and stress-corrosion cracking in high-purity water (nuclear service).
UNS N06601 EN / W.Nr. 2.4851
Aluminium-bearing nickel-chromium with a tightly adherent oxide scale — superior oxidation resistance in cycling service to about 1200 °C; radiant tubes, furnace retorts and thermal-processing equipment.
UNS N06625 EN / W.Nr. 2.4856
Molybdenum- and niobium-strengthened nickel-chromium — outstanding strength from cryogenic to about 980 °C plus pitting and crevice corrosion resistance. Aerospace, chemical and offshore (seawater, sour gas) service.
UNS N07718 EN / W.Nr. 2.4668
Precipitation-hardening nickel-chromium alloy strengthened by niobium — the workhorse superalloy for gas-turbine discs, rocket motors and high-strength bolting to about 700 °C, with excellent weldability.
UNS N07750 EN / W.Nr. 2.4669
Precipitation-hardening nickel-chromium grade for springs and high-temperature bolting to about 700 °C after age treatment.
UNS N08800 / N08810 / N08811 EN / W.Nr. 1.4876
Nickel-iron-chromium with controlled grain size and aluminium/titanium (800H/800HT) for creep strength — furnace tubing, steam reformers and heat exchangers to about 1100 °C.
UNS N08825 EN / W.Nr. 2.4858
Nickel-iron-chromium with molybdenum and copper — broad resistance to sulphuric and phosphoric acids, seawater and sour gas. Chemical processing, acid pickling and pollution-control equipment.
Nominal ranges as published in the common product standards. Values are indicative and for comparison only — always purchase against the current ASTM/EN specification and the mill test certificate.
| Element | Content |
|---|---|
| Nickel (Ni) | ≥ 72.0 |
| Chromium (Cr) | 14.0 – 17.0 |
| Iron (Fe) | 6.0 – 10.0 |
| Carbon (C) | ≤ 0.15 |
| Element | Content |
|---|---|
| Nickel (Ni) | 58.0 – 63.0 |
| Chromium (Cr) | 21.0 – 25.0 |
| Iron (Fe) | bal. |
| Aluminium (Al) | 1.0 – 1.7 |
| Element | Content |
|---|---|
| Nickel (Ni) | ≥ 58.0 |
| Chromium (Cr) | 20.0 – 23.0 |
| Molybdenum (Mo) | 8.0 – 10.0 |
| Niobium + Tantalum | 3.15 – 4.15 |
| Iron (Fe) | ≤ 5.0 |
| Element | Content |
|---|---|
| Nickel (Ni) | 50.0 – 55.0 |
| Chromium (Cr) | 17.0 – 21.0 |
| Niobium + Tantalum | 4.75 – 5.50 |
| Molybdenum (Mo) | 2.80 – 3.30 |
| Titanium (Ti) | 0.65 – 1.15 |
| Aluminium (Al) | 0.20 – 0.80 |
| Element | Content |
|---|---|
| Nickel (Ni) | ≥ 70.0 |
| Chromium (Cr) | 14.0 – 17.0 |
| Titanium (Ti) | 2.25 – 2.75 |
| Niobium + Tantalum | 0.70 – 1.20 |
| Element | Content |
|---|---|
| Nickel (Ni) | 30.0 – 35.0 |
| Chromium (Cr) | 19.0 – 23.0 |
| Iron (Fe) | 39.5 min |
| Aluminium (Al) | 0.15 – 0.60 |
| Titanium (Ti) | 0.15 – 0.60 |
| Element | Content |
|---|---|
| Nickel (Ni) | 38.0 – 46.0 |
| Chromium (Cr) | 19.5 – 23.5 |
| Molybdenum (Mo) | 2.5 – 3.5 |
| Copper (Cu) | 1.5 – 3.0 |
| Titanium (Ti) | 0.6 – 1.2 |
Typical minimum values for the common product forms in the annealed / solution-treated condition. Actual properties depend on product form, specification revision and heat treatment.
| Property | Value |
|---|---|
| Tensile strength (min, annealed) | 550 MPa |
| Yield strength (min, annealed) | 240 MPa |
| Elongation (min) | 30 % |
| Density | 8.47 g/cm³ |
| Property | Value |
|---|---|
| Tensile strength (min, annealed) | 600 MPa |
| Yield strength (min, annealed) | 230 MPa |
| Density | 8.1 g/cm³ |
| Property | Value |
|---|---|
| Tensile strength (min, annealed) | 827 MPa |
| Yield strength (min, annealed) | 414 MPa |
| Elongation (min) | 30 % |
| Density | 8.44 g/cm³ |
| Property | Value |
|---|---|
| Tensile strength (aged, min) | 1275 MPa |
| Yield strength (aged, min) | 1035 MPa |
| Elongation (aged, min) | 12 % |
| Density | 8.19 g/cm³ |
| Property | Value |
|---|---|
| Tensile strength (aged, typical) | ≈ 1150 MPa |
| Yield strength (aged, typical) | ≈ 790 MPa |
| Density | 8.28 g/cm³ |
| Property | Value |
|---|---|
| Tensile strength (min, annealed) | 500 – 600 MPa |
| Yield strength (min, annealed) | 170 – 275 MPa |
| Elongation (min) | 30 % |
| Density | 7.95 g/cm³ |
| Property | Value |
|---|---|
| Tensile strength (min, annealed) | 586 MPa |
| Yield strength (min, annealed) | 241 MPa |
| Elongation (min) | 30 % |
| Density | 8.14 g/cm³ |
| Property | Value |
|---|---|
| Melting range (Inconel 600) | ≈ 1354 – 1413 °C |
| Melting range (Incoloy 800) | ≈ 1350 – 1400 °C |
| Thermal conductivity (600, 20 °C) | ≈ 15 W/m·K |
| Modulus of elasticity (600) | ≈ 210 GPa |
Inconel & Incoloy is offered in the product forms below. Availability varies by grade and size — confirm the exact combination with our sales desk.
Seamless and welded pipes and tubes to ASTM/ASME, IS and BS specifications — including boiler, air-preheater and corten tubes.
Hot-rolled and cold-rolled sheets, plates, coils, circles and flats in standard and cut sizes.
Butt-weld, forged and socket-weld fittings — elbows, tees, reducers, caps, stub ends, olets and nipples.
Bright and black round bars, square and hex bars, flats and wires in stainless, duplex, alloy, carbon and nickel-alloy grades.
Bolts, nuts, studs, washers and threaded rods in alloy and stainless grades.
Weld neck, slip-on, blind, lap joint, socket weld, threaded, spectacle, ring joint, orifice and deck flanges to ASME B16.5, 150# – 2500#.
| Standard | Scope |
|---|---|
| ASTM B167 / ASME SB167 | Seamless nickel-chromium-iron pipe and tube |
| ASTM B409 / ASME SB409 | Nickel-iron-chromium plate, sheet and strip (800 family) |
| ASTM B168 / ASME SB168 | Ni-Cr-Fe plate, sheet and strip (600/601) |
| ASTM B443 / ASME SB443 | Inconel 625 plate, sheet and strip |
| ASTM B637 | Age-hardened 718 / X-750 bar and forgings |
| ASTM B564 / SB564 | Nickel-alloy forgings |
| ASTM B425 | Ni-Fe-Cr rod and bar (825) |
| ASTM B166 / SB166 | Ni-Cr-Fe rod and bar |
Inconel and Incoloy are supplied to ASTM/ASME specifications with EN 10204 Type 3.1 certification and heat-number traceability. For 718 and X-750, the age/heat-treat condition and mechanical test results are reported. Grain size, hardness and third-party inspection can be arranged with the enquiry.
Inconel is a nickel-chromium alloy family (chromium in a nickel base); Incoloy replaces part of the nickel with iron, which lowers cost while keeping high-temperature oxidation resistance. Incoloy 800-family is the classic furnace-grade; Inconel grades lead in strength and the most severe hot-corrosion service.
Incoloy 800H/800HT is the standard choice for steam reformers and furnace tubing to about 1100 °C with its controlled grain size and creep strength. Inconel 601 is preferred where oxidation cycling is severe.
It combines high strength with outstanding pitting and crevice resistance (PREN ≈ 51) in seawater and sour gas, resists chloride stress-corrosion cracking, and welds readily — ideal for subsea and cladding duty.
Yes — one of its key advantages over older superalloys is excellent weldability in the aged condition, which is why it dominates fabricated hot-section hardware.
Typical choices: ENiCrFe-3 (82) for 600/601, ENiCrMo-3 (625) filler for 625 and dissimilar joints, ENiFeCr-3 (inconel 82/182 family) for 800-family. Confirm the WPS for your application.
Send the grade, product form, size and quantity — our sales desk replies with an offer and lead time within one business day.
Material, grade, product form and quantity — our sales desk replies within one business day.