Inconel 783 pipes and tubes (UNS R30783) are made to order from Alloy 783, a cobalt nickel iron superalloy developed for applications where dimensional stability at high temperature is important. With about 5.5% aluminium, the alloy combines low thermal expansion with high strength while also providing better oxidation resistance than many conventional low expansion alloys. Amardeep Steel supplies Inconel 783 pipes and tubes from billet and bar to meet project specific requirements. Compare our Inconel 718 pipes and tubes and Inconel X-750 pipes and tubes, or browse all Inconel pipes and tubes. Every order comes with mill test certificates to EN 10204 3.1 and full heat traceability.
What Are Inconel 783 Pipes and Tubes?
Inconel 783 was developed for gas turbine parts where tight clearances must be held as the engine heats up: casings, shrouds, seals and rings. Its low expansion means the gap between rotating and static parts changes less, which improves efficiency. The high aluminium forms a protective oxide, so it does not need the coatings older low expansion alloys require.
How Alloy 783 Tube and Rings Are Made
Alloy 783 is produced as forging billet to AMS 5940, bar and extruded section. Tube, sleeves and rings are made to order by ring rolling, extrusion or boring, then given the standard solution and ageing treatment. Send us the drawing and we will confirm the route.
Inconel 783 Pipe and Tube Specifications
Parameter | Details |
|---|---|
Grade | UNS R30783, Inconel 783, Alloy 783 |
Material standard | AMS 5940 (forging billet) |
Tube form | Rings, sleeves and bored or extruded tube, made to order |
Condition | Solution treated and aged |
Length | Random, fixed and cut lengths |
Ends | Plain end; bevelled on request |
Test Certificate | EN 10204 3.1, with 3.2 available on request |
Inconel 783 Chemical Composition
Element | Content (%) |
|---|---|
Cobalt (Co) | Balance |
Nickel (Ni) | 26.0 to 30.0 |
Iron (Fe) | 24.0 to 27.0 |
Aluminium (Al) | 5.0 to 6.0 |
Niobium (Nb) | 2.5 to 3.5 |
Chromium (Cr) | 2.5 to 3.5 |
Titanium (Ti) | 0.1 to 0.4 |
Main element limits from the Special Metals bulletin. Confirm minor element limits against AMS 5940.
Inconel 783 Mechanical Properties
Property (typical, standard heat treatment) | Value |
|---|---|
Tensile Strength | About 1194 MPa (173 ksi) |
Yield Strength (0.2% offset) | About 779 MPa (113 ksi) |
Elongation | 24% |
Typical room temperature values from the producer bulletin. These are not specification minimums.
Inconel 783 Physical Properties
Property | Typical value |
|---|---|
Density | 7.81 g/cm³ |
Melting range | 1336°C to 1407°C |
Modulus of elasticity (21°C) | 177 GPa |
Thermal expansion | Low; about 12.9 µm/m·°C at 650°C (7.15 µin/in·°F) |
Typical values from the alloy producer. Values for each heat are on the mill certificate.
Inconel 783 Equivalent Grades
Standard | Designation |
|---|---|
UNS | R30783 |
Trade names | Inconel 783, Alloy 783 |
AMS | 5940 |
EN / W.Nr | No widely used EN number; order by UNS R30783 |
Inconel 783 vs 718 vs X-750
Property | Inconel 783 | Inconel 718 | Inconel X-750 |
|---|---|---|---|
Base | Cobalt-nickel-iron | Nickel-chromium-iron | Nickel-chromium |
Aluminium | 5.0 to 6.0% | 0.2 to 0.8% | 0.40 to 1.00% |
Density | 7.81 g/cm³ | 8.19 g/cm³ | 8.28 g/cm³ |
Thermal expansion | Low | Normal | Normal |
Main use | Clearance control rings | Shafts, discs, tube | Springs, ducting |
Where low expansion is not needed, Inconel 718 pipes and tubes are easier to source.
Inconel 783 Tube Size and Weight Chart
OD (mm) | 1.5 mm wall | 2.0 mm wall | 3.0 mm wall | 4.0 mm wall | 6.0 mm wall |
|---|---|---|---|---|---|
12.70 | 0.41 | 0.53 | 0.71 | n/a | n/a |
19.05 | 0.65 | 0.84 | 1.18 | n/a | n/a |
25.40 | 0.88 | 1.15 | 1.65 | 2.10 | 2.86 |
31.75 | 1.11 | 1.46 | 2.12 | 2.72 | 3.79 |
38.10 | 1.35 | 1.77 | 2.58 | 3.35 | 4.73 |
50.80 | 1.81 | 2.39 | 3.52 | 4.59 | 6.60 |
63.50 | 2.28 | 3.02 | 4.45 | 5.84 | 8.46 |
76.20 | 2.75 | 3.64 | 5.39 | 7.09 | 10.33 |
Indicative weights in kg/m for made to order tube, calculated at 7.81 g/cm³ as (OD minus wall) x wall x π x 7.81 / 1000. This alloy has no standard pipe schedule; any OD and wall within the mill or machining range can be quoted.
Applications of Inconel 783 Pipes and Tubes
- Gas turbine casings, shrouds and seal rings
- Compressor and turbine clearance control rings
- Exhaust system containment parts
- Precision hot section hardware
Testing and Documentation
Every order of Inconel 783 pipe and tube goes through the checks below at our testing facility or approved third party labs.
- Chemical analysis and PMI
- Tension test after the specified heat treatment
- Hardness test
- Ultrasonic test for wall soundness
- Heat treatment record supplied with the certificate
- Visual and dimensional inspection
Mill test certificates are issued to EN 10204 3.1, with 3.2 available on request. You can view our approvals on the certificates page.
Packing and Marking
Each length is marked with UNS R30783, size, heat number and manufacturer name. Ends are capped and tubes are packed in wooden boxes, kept apart from carbon steel. Read more about our packing and despatch process.
Request a Quote for Inconel 783 Pipes & Tubes
Send us the drawing or finished OD, ID, length, heat treatment and quantity, and our team will reply with price and delivery. Use the enquiry form or reach us through the contact page.
Frequently Asked Questions
What is Inconel 783?
Inconel 783 (UNS R30783) is a low expansion cobalt-nickel-iron superalloy with about 5.5% aluminium, used for gas turbine clearance control parts.
Why is Inconel 783 a UNS R number?
UNS R numbers cover cobalt and other reactive or refractory based alloys. Cobalt is the largest element in 783, so it is R30783.
Is Inconel 783 available as pipe?
Alloy 783 is produced as billet, bar and extruded section. Tube, sleeves and rings are made to order.
What is the density of Inconel 783?
The density of Inconel 783 is 7.81 g/cm³.
