LEADING METAL GASKETS MANUFACTURER, EXPORTER & SUPPLIER
Manufacturer, Exporter & Supplier of Premium Industrial Gaskets
All Types of Inconel Industrial Gaskets in Inconel 600, 625, 718 & 825 — Precision Manufactured for Extreme Temperature, High Pressure & Highly Corrosive Environments
Sunflex Metalloy is a specialist manufacturer of Inconel industrial gaskets — supplying the complete range of gasket types across all major Inconel nickel-chromium superalloy grades to the aerospace, gas turbine, nuclear power, offshore oil and gas, petrochemical high-temperature processing, and advanced chemical manufacturing industries. From precision Ring Type Joint (RTJ) and Spiral Wound gaskets for high-pressure offshore and refinery service, to Kammprofile, Corrugated, Metal Jacketed, Lens Ring, and Solid Metal designs for extreme temperature and corrosion-critical applications, we manufacture every form of Inconel sealing solution to ANSI, ASME, DIN, BS, JIS, API, and NACE standards — in both standard and fully custom dimensions.
Inconel alloys occupy the highest tier of industrial gasket materials — specified for applications where temperatures exceed 600°C, where oxidizing or carburizing atmospheres would destroy conventional stainless steel gaskets, where cyclic thermal stress demands exceptional fatigue resistance, or where aggressive acid and halide media require a metallic gasket material of the highest corrosion resistance. Every Sunflex Metalloy Inconel gasket is manufactured from certified raw material with full chemical and mechanical traceability, and supplied with MTC as per EN 10204 3.1 or 3.2 — with NACE MR0175 compliance documentation available for sour service applications.
Grades Available: Inconel 600 · Inconel 601 · Inconel 625 · Inconel 718 · Inconel 825 · UNS N06600 · UNS N06625 · UNS N07718 · UNS N08825
Inconel is the collective trade name for a family of austenitic nickel-chromium superalloys developed specifically for applications that operate beyond the reliable performance limits of conventional stainless steel and carbon steel. The defining characteristic of Inconel alloys — and the primary reason they are specified for industrial gaskets in extreme service applications — is their ability to retain high mechanical strength, oxidation resistance, and corrosion resistance at temperatures where most other engineering metals either oxidize rapidly, lose structural integrity, or undergo creep deformation under sustained load.
Beyond their extraordinary high-temperature performance, Inconel alloys offer exceptional resistance to a wide range of corrosive environments — including oxidizing and reducing acids, chloride-containing media, wet chlorine, sulfur-containing gases, and high-temperature oxidizing and carburizing atmospheres. This combination of extreme temperature capability and broad chemical resistance makes Inconel gaskets the only technically acceptable choice in applications such as gas turbine exhaust flanges, nuclear reactor primary circuit connections, offshore wellhead sour service, high-temperature petrochemical reactor nozzles, and advanced aerospace propulsion systems.
At Sunflex Metalloy, we manufacture Inconel gaskets across five primary grades — Inconel 600, Inconel 601, Inconel 625, Inconel 718, and Inconel 825 — each with a distinct balance of high-temperature strength, oxidation resistance, and corrosion resistance properties tailored to specific application requirements.
| Grade | UNS | Ni Content | Key Properties | Primary Application |
|---|---|---|---|---|
| Inconel 600 | N06600 | 72% min | Excellent oxidation resistance to 1175°C, good strength | Furnaces, heat treatment, nuclear, chemical |
| Inconel 601 | N06601 | 60% min | Superior oxidation resistance with Al addition, excellent carburization resistance | High-temp furnace flanges, industrial heating |
| Inconel 625 | N06625 | 58% min | Outstanding fatigue strength, seawater & acid corrosion resistance | Offshore, aerospace, chemical processing |
| Inconel 718 | N07718 | 50–55% | Highest strength Inconel grade, excellent fatigue & creep resistance | Gas turbines, aerospace, extreme pressure |
| Inconel 825 | N08825 | 38–46% | Enhanced sulfuric & phosphoric acid resistance, versatile corrosion resistance | Chemical processing, pollution control, sour service |
Sunflex Metalloy manufactures all eight major Inconel gasket types — each engineered for specific pressure classes, temperature ranges, flange configurations, and the extreme service environments where Inconel is the required or specified gasket material.
Inconel Ring Type Joint (RTJ) gaskets are precision-machined solid metallic sealing rings manufactured from Inconel nickel-chromium superalloy for use with RTJ flange faces in the most demanding high-pressure, high-temperature, and corrosion-critical industrial applications. The RTJ ring seats into the precision-machined trapezoidal groove of the RTJ flange under bolt loading, deforming plastically to create a high-integrity metal-to-metal seal capable of withstanding extreme operating pressures, elevated temperatures, and highly aggressive fluid media.
Inconel 625 is the most widely specified grade for offshore and subsea RTJ gasket applications — its combination of outstanding corrosion resistance in seawater and chloride media, high fatigue strength, and resistance to stress corrosion cracking makes it the first-choice material for subsea pipeline flanges, wellhead assemblies, and offshore production platform connections in sour service environments. Sunflex Metalloy manufactures Inconel RTJ gaskets in R-type oval and octagonal profiles and RX/BX pressure-energized types to API 6A and ASME B16.20 specifications.
Inconel Spiral Wound gaskets are semi-metallic sealing elements constructed by spirally winding a thin Inconel metallic strip alternately with a soft filler material — typically flexible graphite or ceramic fibre for high-temperature service — to produce a resilient, self-energizing gasket assembly of the highest performance tier. The Inconel winding strip provides the extraordinary temperature resistance, oxidation resistance, and corrosion resistance of the superalloy in a spiral wound gasket format.
Inconel spiral wound gaskets are the standard specification for high-temperature process flanges in refineries, petrochemical plants, and power generation facilities operating above the reliable service temperature of SS 321 or SS 347 winding materials — typically above 650°C to 700°C. Ceramic fibre filler is used in the highest temperature applications where graphite filler would oxidize — providing reliable sealing performance at temperatures up to 1000°C and above.
Inconel Corrugated Metal gaskets are manufactured by precision-forming an Inconel alloy sheet into a series of concentric corrugations across the gasket face — creating multiple raised contact ridges that concentrate the bolt load onto narrow sealing lines and establish multiple independent sealing paths across the gasket face. The all-Inconel construction ensures full retention of the material's extraordinary high-temperature strength and corrosion resistance across the corrugated gasket profile.
Inconel corrugated gaskets are particularly valuable in high-temperature pressure vessel, reactor, and process column applications where the combination of extreme operating temperature, aggressive process chemistry, and limited bolt load capacity makes an Inconel corrugated gasket the practical solution. Available plain (bare Inconel) for the highest temperature service or with a ceramic fibre or graphite overlay for enhanced conformability at moderate temperatures.
Inconel Metal Jacketed gaskets consist of a high-temperature soft filler core — typically ceramic fibre, flexible graphite, or high-temperature compressed fibre — enclosed within a formed Inconel metal outer jacket. The Inconel jacket provides the outer sealing surface and structural protection for the filler core, resisting the extreme temperatures, oxidizing atmospheres, and aggressive chemical environments encountered in the most demanding industrial process applications.
Inconel jacketed gaskets are particularly valuable in high-temperature reactor closure applications, large-diameter furnace and kiln flanges, and pressure vessel manway sealing in extreme service environments. Sunflex Metalloy manufactures Inconel jacketed gaskets in single-jacketed and double-jacketed configurations, in Inconel 600, 625, and 718 grades, with filler material selected to match the operating temperature and chemical environment.
Inconel Solid Metal gaskets represent the absolute highest performance tier in the Sunflex Metalloy gasket range — manufactured entirely from solid Inconel bar, plate, or sheet stock with no composite layers, no filler materials, and no bonded components of any kind. This all-Inconel, single-material construction delivers the full, undiluted mechanical and chemical performance of the Inconel superalloy at every point across the gasket sealing face.
Solid Inconel gaskets are precision-manufactured in flat ring, lens ring, oval ring, octagonal ring, and fully custom machined profiles — from certified Inconel bar or plate stock using CNC machining operations. Inconel 625 is the most widely specified grade for solid metal gaskets in offshore and chemical service. Inconel 718 is specified where maximum tensile and yield strength are required — such as gas turbine casing closure seals and extreme high-pressure vessel connections.
Inconel Lens Ring gaskets are precision CNC-machined solid Inconel sealing rings with a convex spherical cross-section profile — engineered for ultra-high-pressure sealing in the most extreme temperature and corrosion-critical service environments where standard metallic lens ring materials would be inadequate. The convex spherical profile contacts the matching concave conical seat of the mating flange at a single circular line, concentrating the assembly load onto a very narrow contact area to generate extremely high sealing stress.
Inconel lens ring gaskets are specified in ultra-high-pressure gas turbine connections, high-temperature pipeline flanges in extreme process environments, and instrumentation connections on high-temperature or sour service process systems. Inconel 625 is the most widely specified grade for its combination of high strength, fatigue resistance, and corrosion resistance in both seawater and aggressive acid environments. Sunflex Metalloy manufactures Inconel lens ring gaskets to DIN 2696 and custom specifications.
Inconel Octagonal and Oval Ring gaskets are precision-machined solid Inconel sealing rings designed for use with Ring Type Joint (RTJ) flanges in the most demanding high-pressure, high-temperature, and corrosion-critical oilfield, offshore, and petrochemical process applications. Both profiles seat into the trapezoidal groove of the RTJ flange and create a metal-to-metal seal through plastic deformation of the Inconel ring under bolt loading.
Inconel 625 RTJ rings are the standard specification for offshore subsea and wellhead applications in sour service (H₂S-containing) environments — offering a combination of high strength, excellent fatigue resistance, outstanding seawater and chloride corrosion resistance, and full NACE MR0175 compliance. Sunflex Metalloy manufactures both profiles across all API standard ring numbers and custom dimensions.
Inconel Kammprofile gaskets combine the extraordinary material properties of Inconel superalloy with the precision multi-line sealing geometry of the Kammprofile design. The gasket features a solid Inconel metal core with precision CNC-machined concentric serrated grooves on both faces, covered with a bonded soft overlay of ceramic fibre or flexible graphite selected for the specific operating temperature of the application. Under bolt compression, the sharp Inconel serration ridges concentrate the clamping load onto multiple high-stress sealing lines across the gasket face.
The use of Inconel as the Kammprofile core material brings the full high-temperature and corrosion-resistant properties of the superalloy to the Kammprofile design — enabling reliable reusable sealing performance in extreme service environments where stainless steel Kammprofile cores would oxidize, corrode, or lose mechanical integrity. The all-Inconel core maintains its dimensional stability, hardness, and surface integrity across repeated thermal cycles, ensuring effective re-overlaying and reuse at plant turnaround.
Match your operating temperature, pressure class, flange configuration, and service environment to the right Inconel gasket form:
| Gasket Type | Pressure Class | Temp Range | Flange Face Type | Reusable | Best Application |
|---|---|---|---|---|---|
| Ring Type Joint (RTJ) | Class 600–2500 | Up to 700°C+ | RTJ Groove | No | Offshore wellheads, sour service, subsea |
| Spiral Wound | Class 150–2500 | Up to 1000°C+ | RF, FF, T&G | No | High-temp process piping, refineries, turbines |
| Corrugated Metal | Class 150–900 | Up to 1100°C | RF, FF | No | Reactors, furnaces, limited bolt load flanges |
| Metal Jacketed | Class 150–900 | Up to 1100°C | FF, RF, MF, T&G | No | Reactor closures, furnace flanges, large vessels |
| Solid Metal | Class 150–2500 | Up to 1175°C | All types | No | Gas turbines, nuclear, extreme service |
| Lens Ring | Ultra-high pressure | Up to 1000°C+ | Conical seat | No | Gas turbines, ultra-high pressure pipelines |
| Octagonal / Oval Ring | Class 600–2500 | Up to 700°C+ | RTJ Groove | No | Sour service offshore, NACE applications |
| Kammprofile | Class 150–2500 | Up to 1000°C+ | RF, FF, MF, T&G | Yes (core) | High-temp heat exchangers, process vessels |
Selecting the correct Inconel grade for your gasket application is an important engineering decision — each grade has a distinct performance profile, and the wrong selection can result in either unnecessary cost (over-specification) or premature gasket failure (under-specification).
Inconel 600 (UNS N06600) — Your primary requirement is oxidation resistance and corrosion resistance at very high temperatures — up to 1175°C. The definitive choice for industrial furnace components, heat treatment equipment, and high-temperature process flanges in oxidizing and carburizing atmospheres. Also specified in nuclear applications.
Inconel 601 (UNS N06601) — Maximum oxidation and carburization resistance at the highest temperatures. The aluminium addition creates an exceptionally stable alumina-rich oxide layer providing superior protection against oxidation and carburization compared to Inconel 600 in the most demanding high-temperature furnace and combustion environments.
Inconel 625 (UNS N06625) — Outstanding fatigue strength, seawater and chloride corrosion resistance, and resistance to stress corrosion cracking are required alongside high-temperature capability. The standard Inconel specification for offshore subsea, wellhead, and sour service gasket applications. Also widely specified in aerospace, chemical processing, and marine engineering.
Inconel 718 (UNS N07718) — Maximum mechanical strength is the primary requirement. Inconel 718's age-hardening capability gives it the highest tensile and yield strength of all common Inconel grades across a broad temperature range — the specification for gas turbine disc and casing flanges, aerospace propulsion system sealing, and applications requiring the maximum available strength.
Inconel 825 (UNS N08825) — Resistance to sulfuric acid, phosphoric acid, and mixed acid environments is required alongside high-temperature capability. The preferred Inconel grade for chemical processing, pollution control systems, and sour oil and gas service involving mixed H₂S and CO₂ environments.
