Tesco Steel & Engineering manufactures Inconel X-750 flanges (UNS N07750 / W.Nr. 2.4669) — the gamma-prime age-hardenable nickel-chromium superalloy with ~70% Ni, ~15.5% Cr and ~7% Fe plus titanium, aluminium and niobium. It is essentially a precipitation-hardenable version of Alloy 600: it keeps that alloy's corrosion and oxidation resistance while adding high strength, creep-rupture strength and relaxation resistance through gamma-prime Ni₃(Ti,Al) precipitation — usable with high strength to ~815°C and oxidation resistance to ~980°C. Available in weld neck, slip-on, blind, socket-weld, threaded, lap-joint, spectacle and orifice types to ASTM B637 / ASME B16.5. Class 150 to 2500, NPS 1/2″ to 24″, PN6 to PN400. ISO 9001:2015 certified. Made in India.
Inconel X-750 (UNS N07750) Flanges
Inconel X-750 Weld Neck & Blind Flanges
Tesco Steel & Engineering manufactures Inconel X-750 flanges in all types from weld neck to orifice, Class 150 to 2500 — supplied in the solution-treated-and-aged condition with EN 10204 3.1 / 3.2 certification, PMI and third-party inspection on request. Explore the wider Inconel flange range, the related Inconel 718 flanges and base Inconel 600 flanges, and the flange dimension charts.
| Inconel X-750 flanges are available in the following specifications: | |
|---|---|
| Material Grade | Inconel X-750 / UNS N07750 / W.Nr. 2.4669 (NiCr15Fe7TiAl) |
| Alloy Type | Age-hardenable nickel-chromium superalloy (gamma-prime Ni₃(Ti,Al)) |
| Condition | Solution treated + precipitation (age) hardened |
| Size | 1/2″ NB to 24″ NB (DN 15 to DN 600); larger to ASME B16.47 |
| Class / Rating | 150#, 300#, 600#, 900#, 1500#, 2500# · 3000#, 6000#, 9000# (socket-weld / threaded) |
| Pressure Ratings | PN 6 – PN 400 (PN6, 10, 16, 25, 40, 64, 100, 160, 250, 320, 400) |
| Material Standards | ASTM B637, ASME SB637, AMS 5667 / 5668 / 5670; EN designation 2.4669 |
| Dimensional Standards | ASME B16.5, ASME B16.47 (Series A & B), MSS SP-44, DIN EN 1092-1 |
| Flange Types | Weld Neck (WNRF), Slip-On (SORF), Blind, Socket Weld (SWRF), Lap Joint, Threaded / Screwed, Spectacle Blind, Long Weld Neck, Orifice, Plate |
| Flange Faces | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ), Tongue & Groove (T&G) |
| Weld Filler | ERNiCrFe-7 (Inconel Filler Metal 69) |
| Testing | PMI, hardness/tensile, hydrostatic, UT, MT/PT per spec; EN 10204 3.1 / 3.2 |
Inconel X-750 is a high-nickel, chromium-bearing alloy with deliberate titanium, aluminium and niobium additions. These form the gamma-prime Ni₃(Ti,Al) precipitate during ageing — the source of the alloy's high strength, creep-rupture strength and relaxation resistance at temperature.
| Element | Inconel X-750 (UNS N07750) |
|---|---|
| Nickel (Ni) | 70.0% min (~70%) |
| Chromium (Cr) | 14.0 – 17.0% (~15.5%) |
| Iron (Fe) | 5.0 – 9.0% (~7%) |
| Titanium (Ti) | 2.25 – 2.75% |
| Niobium + Tantalum (Nb+Ta) | 0.70 – 1.20% |
| Aluminium (Al) | 0.40 – 1.00% |
| Manganese (Mn) | 1.0% max |
| Carbon (C) | 0.08% max |
| Mechanical Property (solution treated + aged, typical) | Inconel X-750 |
|---|---|
| Tensile Strength | 1100 – 1300 MPa (160–190 ksi) |
| Yield Strength 0.2% | 690 – 900 MPa (100–130 ksi) |
| Elongation | 20 – 30% |
| High-Strength Service Temp | to ~815 °C (1500 °F) |
| Oxidation Resistance | to ~980 °C (1800 °F) |
| Density | 8.28 g/cm³ |
| Standard | Inconel X-750 Designation |
|---|---|
| UNS (USA) | N07750 |
| Werkstoff (Germany) | 2.4669 |
| EN designation | NiCr15Fe7TiAl |
| ASTM / ASME | B637 / SB637 (age-hardenable forgings) |
| AMS | 5667 / 5668 / 5670 / 5671 |
| Common names | Inconel X-750, Inconel X750, Alloy X-750, Nimonic 90 (similar class) |
Inconel X-750 Weld Neck Flange (WNRF)
Inconel X-750 Slip-On Flange (SORF)
Inconel X-750 Blind Flange
| Flange Type | Description & Inconel-X-750-Specific Use |
|---|---|
| Weld Neck (WNRF) | Tapered hub butt-welded to pipe for high-integrity, high-strength high-temperature service; weld solution-annealed with ERNiCrFe-7 filler, then age. |
| Slip-On (SORF) | Fillet-welded over the pipe; used in high-strength piping at moderate pressure. |
| Blind | Seals pipe ends and vessel nozzles in high-temperature, high-stress systems. |
| Socket Weld (SWRF) | Small-bore (1/2″–2″) instrument and high-pressure branch connections. |
| Lap Joint (LJRF) | Used with an Inconel X-750 stub end where frequent dismantling is required; economizes on alloy in the backing ring. |
| Threaded (TRFF) | Internal NPT/BSP threads for non-welded high-strength connections. |
| Spectacle Blind / Long Weld Neck / Orifice | Isolation spades, nozzle/long-neck and flow-metering flanges in Inconel X-750 for high-temperature high-strength duty. |
| Property | X-750 (N07750) | 718 (N07718) | 600 (N06600) |
|---|---|---|---|
| Strengthening | Gamma-prime (Ti,Al) | Gamma-double-prime (Nb) | None (solid-solution) |
| Heat treatable | Yes (solution + age) | Yes (solution + age) | No |
| Peak tensile strength | ~1100-1300 MPa | ~1240-1450 MPa | ~550-690 MPa |
| High-strength temperature | ~815°C | ~700°C | — |
| Weldability | Moderate (strain-age sensitive) | Good | Excellent |
| Typical role | High-temp springs, bolting, turbine | Max-strength turbine/downhole | General nickel alloy, chloride/HT |
Gamma-prime ageing gives high tensile, creep-rupture and relaxation resistance retained to ~815°C.
Resists stress relaxation at temperature — the classic choice for hot springs and bolting.
Retains the corrosion and oxidation resistance of its Alloy 600 base, including chloride-SCC resistance.
Tough at cryogenic temperatures and oxidation-resistant to ~980°C — a very wide service range.
| Industry | Typical Application |
|---|---|
| Gas Turbines & Aerospace | Blades, rotors, bolting, springs and high-strength high-temperature flanges |
| Rocket & Aero-Engine | High-stress, high-temperature flanged components and fasteners |
| Nuclear | Reactor springs, fasteners and high-strength components |
| Springs & Bolting | High-temperature springs, bolts and relaxation-critical fasteners |
| Heat Treatment / Furnaces | High-strength high-temperature fixtures and flanged connections |
| Power Generation | High-temperature, high-stress flanged hardware |
Made from certified Alloy X-750 with PMI verification of Cr, Ti and Al — full chemistry and heat-treatment record on the MTC.
Forged to ASTM B637 / AMS 5667 in the specified solution-treated-and-aged temper for full strength.
WNRF, SORF, blind, socket-weld, threaded, lap-joint, spectacle, LWN, orifice and plate — in RF, FF, RTJ and T&G.
EN 10204 3.1 / 3.2 MTC with hardness/tensile results, heat/lot traceability, hydrostatic and third-party inspection on request.
Inconel X-750 flange prices reflect the high nickel content plus forging and the solution + ageing heat treatment — it is a premium high-strength high-temperature superalloy for turbine, spring and bolting service. Tesco Steel & Engineering offers competitive ex-works pricing from Mumbai with full export documentation and material traceability. Click Ask for Quote or message us on WhatsApp at +91 92233 66922 with flange type, size (NB), pressure class, quantity and documentation requirements.
Q1. What is an Inconel X-750 flange?
An Inconel X-750 flange is a pipe flange made from the gamma-prime age-hardenable nickel-chromium superalloy UNS N07750 (W.Nr. 2.4669) — about 70% nickel, 15.5% chromium and 7% iron with titanium, aluminium and niobium additions. It is essentially a precipitation-hardenable version of Alloy 600: it keeps that alloy's corrosion and oxidation resistance while adding high strength, creep-rupture strength and relaxation resistance through gamma-prime Ni3(Ti,Al) precipitation. Flanges are forged to ASTM B637 and machined to ASME B16.5 / B16.47 dimensions.
Q2. What is the chemical composition of Inconel X-750?
Inconel X-750 (UNS N07750) nominal composition: nickel 70% minimum (~70%), chromium 14–17% (~15.5%), iron 5–9% (~7%), titanium 2.25–2.75%, niobium plus tantalum 0.7–1.2%, aluminium 0.4–1.0%, with carbon 0.08% max. The titanium, aluminium and niobium form the gamma-prime strengthening phase on ageing.
Q3. How is Inconel X-750 different from Inconel 600?
Inconel X-750 is essentially the age-hardenable version of Alloy 600. They share a similar nickel-chromium base and corrosion/oxidation resistance, but X-750 adds titanium, aluminium and niobium so it can be precipitation-hardened to much higher strength and creep-rupture and relaxation resistance. Alloy 600 is not heat-treatable and is used where moderate strength is acceptable; X-750 is chosen where high strength is needed together with that corrosion resistance and high temperature.
Q4. How is Inconel X-750 different from Inconel 718?
Both are age-hardenable, but by different phases. Inconel 718 is hardened by gamma-double-prime (Ni3Nb), giving the highest strength but limited to about 700 degrees C, with excellent weldability. Inconel X-750 is hardened by gamma-prime (Ni3(Ti,Al)), giving slightly lower peak strength but useful strength and relaxation resistance to about 815 degrees C — which is why X-750 is favoured for high-temperature springs, bolting and gas-turbine parts. X-750 is more prone to strain-age cracking on welding than 718.
Q5. What temperature can Inconel X-750 flanges handle?
Inconel X-750 retains high strength, creep-rupture strength and relaxation resistance to about 815 degrees C (1500 degrees F) and has good oxidation resistance up to about 980 degrees C. It is also tough at cryogenic temperatures. This makes it suitable for high-temperature, high-stress flanged connections, springs and bolting.
Q6. What standards apply to Inconel X-750 flanges?
Inconel X-750 flanges are forged to ASTM B637 (UNS N07750, the age-hardenable nickel-alloy spec) and machined to ASME B16.5 (1/2 inch to 24 inch) or ASME B16.47 / MSS SP-44 for larger sizes. The European designation is W.Nr. 2.4669, and aerospace material is covered by AMS 5667 / 5668 / 5670. Material is supplied with EN 10204 3.1 / 3.2 certification.
Q7. What heat treatment does Inconel X-750 receive?
Inconel X-750 is solution-annealed and then precipitation-aged to develop strength. Several standard tempers exist depending on the application — for example a high-temperature equalize-and-age treatment for creep/relaxation service, or a single/double age for room-temperature strength and springs. We supply flanges in the specified solution-treated-and-aged condition with the heat-treatment record on the certificate.
Q8. Can Inconel X-750 flanges be welded?
Yes, but with care. Inconel X-750 can be welded by GTAW (TIG) using matching ERNiCrFe-7 filler, but because it is gamma-prime (titanium/aluminium) hardened it is more sensitive to strain-age cracking than Inconel 718. Welding is best done in the solution-annealed condition with controlled heat input, followed by a full solution treatment and ageing to restore properties.
Q9. What are the mechanical properties of Inconel X-750?
Typical Inconel X-750 properties in the solution-treated and aged condition: tensile strength about 1100–1300 MPa (160–190 ksi), yield strength about 690–900 MPa (100–130 ksi), elongation about 20–30%, density 8.28 g/cm³. It combines high strength with excellent relaxation and creep-rupture resistance at elevated temperature.
Q10. Are Inconel X-750 flanges supplied with material test certificates?
Yes. Every Inconel X-750 flange is supplied with EN 10204 3.1 (or 3.2) mill test certificates confirming chemistry, mechanical properties, heat-treatment condition and heat/lot traceability, with PMI, hydrostatic testing and third-party inspection on request. Tesco Steel & Engineering is an ISO 9001:2015 certified manufacturer and exporter from Mumbai, India.