Inconel 783 — also known as Alloy 783 and named UNS R30783 per the Unified Numbering System — is a precipitation-hardenable nickel-cobalt-iron (Ni-Co-Fe) superalloy originally developed by Special Metals Corporation (now part of Precision Castparts Corp.). Its main characteristic is a low coefficient of thermal expansion (CTE ≈ 7.5 µm/m·°C) from room temperature to 649°C (1200°F), high strength and good oxidation resistance at elevated temperatures.
The alloy is accordance with ASTM B905 and AMS 5839 standards. It is mainly used for gas turbine clearance control parts, aerospace structural rings, high-temperature valve parts, and any other industries which has high requirement in size stability under thermal cycling.
Jiangsu Liangyi is an ISO 9001:2015 & AS9100 Rev D certified manufacturer and supplier of high-performance Inconel 783 (Alloy 783 / UNS R30783) open die forgings, seamless rolled rings, discs, bars and custom forged parts. Our factory is located in Jiangyin City, Jiangsu Province, China — one of leading forging industrial bases in China.
Our customers are across aerospace, power generation, oil & gas, petrochemical and heavy industrial industries that have requirement on low thermal expansion, high-temperature strength, and long-term size stability. Every Inconel 783 forging we produce is fully traceable, accordance with EN 10204 3.1 Material Test Report (MTR), and inspected per ASTM and EN NDT.
As a leading manufacture in nickel-based superalloy forging, Jiangsu Liangyi also offers a full range of related alloy forgings including Inconel 718, Hastelloy C276, Monel 400, and stainless steel forgings.
Jiangsu Liangyi makes the following custom Inconel 783 (UNS R30783) forged parts per your drawing and technical manuals:
Inconel 783 is the best choice wherever low thermal expansion, oxidation resistance and high-temperature strength are required simultaneously. Jiangsu Liangyi supplied Inconel 783 forgings to customers worldwide for the following uses:
We supply Inconel 783 forged valve bodies, bonnets, stems, balls, seat rings and discs for high-pressure ball valves, check valves, gate valves and back-pressure valves. These forged valve parts are used in high-temperature, high-pressure oil & gas pipelines, power plant steam systems, and chemical plants where size stability of sealing surfaces is important.
Our Inconel 783 forgings include pump casings, impellers, shafts, nozzles, tube sheets, channel flanges and transition cones for high-temperature pressure vessels, heat exchangers and industrial process pumps working in corrosive, high-temperature media.
Inconel 783 forged casings, shrouds and seal rings are used in commercial and military aircraft engine compressors and turbines. The alloy's low CTE allows the engine designer to maintain tighter blade tip clearances over a wide temperature range, this will directly improve specific fuel consumption (SFC) and turbine efficiency. Jiangsu Liangyi supplies AS9100-certified Inconel 783 ring and casing forgings for this use.
Power plants in Europe, the Middle East, and Southeast Asia use Jiangsu Liangyi Inconel 783 forged valve stems, seats, and discs for main steam valves (MSV) and reheat control valves (CV).These parts can work at temperatures up to 649° C. Compared with traditional stainless steel alternatives, they offer stable sizes , longer maintenance intervals and a longer service life..
Our Inconel 783 forged valve bodies and valve stem assemblies are widely used in onshore and offshore high-temperature and high-pressure (HPHT) completion systems. The combination of its low expansion, high strength and corrosion resistance ensures reliable, gas-tight sealing performance under extreme cases, meeting NACE MR0175 / ISO 15156 sour service requirements.
Refineries and chemical plants in China use Jiangsu Liangyi Inconel 783 forgings to centrifugal compressor impellers, pump casings, and shaft sleeves.The size stability of this material under thermal cycling can reduce the wear of seals and increase the normal working time of equipment See more project references →
Inconel 783 forged nozzle necks, tube sheets and transition cones are specified for critical energy equipment where the combination of high strength, low expansion and oxidation resistance is required. Jiangsu Liangyi provides these parts with full ASME-standard material certification documentation.
Jiangsu Liangyi Forged Parts has been manufacturing superalloy forgings since 2008. Our factory is well-equipped with heavy forging presses, ring rolling mills, and heat treatment furnaces; furthermore, our in-house testing laboratory fully equipped,too.
Up to 20 Metric Tons per single piece
Up to 4,000 mm outer diameter
Up to 5,000 mm
UT · MT · PT · Chemical & Mechanical Testing · Hardness
ISO 9001:2015 · AS9100 Rev D · PED · NACE MR0175
From 1 piece – prototype & small batch welcome
Inquiry & Drawing Review
Quotation & Solution Confirmation
Raw Material Procurement & Chemical Inspection
Forging & Heat Treatment (AMS 5839)
NDT Inspection & Size Check
Machining (Optional) & Final Inspection
Delivery & EN 10204 3.1 MTR Documentation
The nominal chemical composition (expressed by weight percentage) of Inconel 783 (Alloy 783 / UNS R30783) is as follows. The cobalt-rich matrix combined with aluminum and niobium precipitation hardeners makes this alloy with unique characteristics of low expansion and high strength.
| Element | Role in Alloy | Weight % |
|---|---|---|
| Cobalt (Co) | Base / matrix; low CTE contributor | Balance |
| Nickel (Ni) | Solid-solution strengthener; corrosion resistance | 26.0 – 30.0 |
| Iron (Fe) | Low CTE adjustment element | 24.0 – 27.0 |
| Aluminum (Al) | Precipitation hardener (β′ Ni₃Al); oxidation resistance | 5.0 – 6.0 |
| Chromium (Cr) | Oxidation and corrosion resistance | 2.5 – 3.5 |
| Niobium (Nb) | Precipitation hardener (γ″ Ni₃Nb); strength | 2.5 – 3.5 |
| Titanium (Ti) | Grain boundary strengthener | 0.10 – 0.40 |
| Boron (B) | Grain boundary cohesion | 0.003 – 0.012 |
| Cu, Mn, Si | Controlled impurities | ≤0.50 each |
| Carbon (C) | Controlled impurity (low C = better weldability) | ≤0.03 |
| Phosphorus (P) | Controlled impurity | ≤0.015 |
| Sulfur (S) | Controlled impurity | ≤0.005 |
Inconel 783 (UNS R30783) requires a two-stage heat treatment way— solution treatment and then precipitation hardening — to get its full mechanical property.Jiangsu Liangyi uses computer-controlled atmosphere furnaces for all heat treatments in house.The MTR includes time-temperature recorder charts.
| Property | Metric (MPa / %) | Imperial (ksi / %) | Notes |
|---|---|---|---|
| Ultimate Tensile Strength (UTS) | 1194 MPa | 173 ksi | Typical |
| 0.2% Yield Strength (YS) | 779 MPa | 113 ksi | Typical |
| Elongation (El) | 24% | 24% | Min 12% per AMS 5839 |
| Reduction in Area (RA) | ~32% | ~32% | Typical |
| Hardness (HRC) | – | – | ~32–38 HRC typical |
| Property | Minimum Value (MPa) | Minimum Value (ksi) |
|---|---|---|
| Tensile Strength (UTS) | ≥896 MPa | ≥130 ksi |
| Yield Strength (0.2% YS) | ≥621 MPa | ≥90 ksi |
| Elongation | ≥15% | ≥15% |
| Property | Value | Condition |
|---|---|---|
| Density | 8.17 g/cm³ (0.295 lb/in³) | Room temperature |
| Coefficient of Thermal Expansion (CTE) | ~7.5 µm/m·°C | RT to 649°C (1200°F) |
| Melting Range | ~1260–1345°C (2300–2453°F) | Approximate |
| Thermal Conductivity | ~12 W/m·K | Room temperature |
| Modulus of Elasticity | ~186 GPa (27 Mpsi) | Room temperature |
Understanding the comparison between Inconel 783 (Alloy 783 / UNS R30783) and other common nickel-based superalloys can help engineers choose the right material for their uses. The following table summarizes the main differences:
| Property / Feature | Inconel 783 (R30783) | Inconel 718 (N07718) | Inconel 625 (N06625) |
|---|---|---|---|
| CTE (RT–649°C) | ~7.5 µm/m·°C ✅ Lowest | ~13 µm/m·°C | ~13.1 µm/m·°C |
| Tensile Strength (RT) | 1194 MPa (173 ksi) | ~1380 MPa (200 ksi) ✅ Highest | ~965 MPa (140 ksi) |
| Max Service Temp. | 649°C (1200°F) | 650°C (1200°F) | 982°C (1800°F) ✅ |
| Base Metal System | Co-Ni-Fe | Ni-Fe-Cr | Ni-Cr-Mo |
| Strengthening Mechanism | Precipitation (β′ + γ″) | Precipitation (γ″ + γ′) | Solid solution |
| Standard | ASTM B905 / AMS 5839 | AMS 5662 / AMS 5664 | ASTM B446 / AMS 5666 |
| Main Uses | Gas turbine clearance control, low-CTE structures | General aerospace, engine parts | Corrosion-resistant, high-temperature piping |
| Forging Availability at Jiangsu Liangyi | ✅ Available | ✅ Available | ✅ Available |
Summary: when dimensional stability and low thermal expansion are the main requirements (e.g., gas turbine clearance control),pls choose Inconel 783.In general aerospace uses, if maximum strength is required, please choose Inconel 718.If good corrosion resistance is required at very high temperatures,please Choose Inconel 625
All Inconel 783 forgings produced by Jiangsu Liangyi are subject to full internal quality control in accordance with the following inspection standards.Each shipment is with relevant documents:
The following are the most common questions about Inconel 783 (Alloy 783 / UNS R30783) forgings, answered by the engineering team of Jiangsu Liangyi for you:
Inconel 783 (Alloy 783 / UNS R30783) is a precipitation-hardenable cobalt-nickel-iron (Co-Ni-Fe)-based superalloy. Its feature is its extremely low coefficient of thermal expansion (CTE ≈ 7.5 µm/m·°C) — a value far lower than that of most nickel superalloys — while also having a tensile strength of about 1194 MPa and oxidation resistance up to 649°C (1200°F). It is just because of this unique characteristic that it has become the best material for the clearance control parts of gas turbines. In these industries, maintaining the tightness of the tip clearance over a wide temperature range is crucial to make sure the working efficiency of the engine.
The standard delivery of Jiangsu Liangyi customized Inconel 783 forgings is 3–4 weeks for prototype / small batch orders and 4–6 weeks for production orders.The delivery includes raw material procurement, forging, heat treatment, non-destructive testing and document preparation. Rush orders can be provided with expedited production services. Please contact [email protected] with your drawing and timeline to obtain the final delivery plan.
Jiangsu Liangyi Inconel 783 forged parts are produced per following standards:
Yes. Jiangsu Liangyi provides an EN 10204 Type 3.1 Material Test Report (MTR) with every delivery, which includes:
EN 10204 Type 3.2 dual-certification by third-party inspectors (Bureau Veritas, SGS, TÜV Rheinland) is acceptable upon request at additional cost.
Jiangsu Liangyi's maximum Inconel 783 forging capabilities is as following:
For projects requiring sizes beyond these limits, please contact us to discuss details.
The main differences between Inconel 783 (UNS R30783) and Inconel 718 (UNS N07718) as following:
Choose Inconel 783 when size stability under thermal cycling is the main requirement. Choose Inconel 718 for maximum strength-to-weight in general aerospace structures.
Yes — Inconel 783, Alloy 783, and UNS R30783 all refer to the same cobalt-nickel-iron superalloy:
All four names are interchangeable for material specification purposes under ASTM B905 and AMS 5839.
Yes. Jiangsu Liangyi welcomes prototype, qualification, and small-batch orders with a minimum order quantity of 1 piece. We support aerospace and energy customers through their R&D, design checking, and qualification testing programs. There is no minimum order value for initial samples. Submit your drawing and technical manuals via our inquiry form or email [email protected] for a prompt quotation.
Yes. Jiangsu Liangyi supports the third-party inspection by inspection agencies including Bureau Veritas (BV), SGS, TÜV Rheinland, Intertek, and Lloyd's Register. Third-party inspection will include size check, documentation review, and final release certification. Please specify your third-party inspection requirements in your inquiry.
Due to its high alloy content, the forging of Inconel 783 (UNS R30783) faces many challenges:
Jiangsu Liangyi's experienced forging engineers have developed great forging and heat treatment ways for Alloy 783 that consistently meet AMS 5839 property requirements.
Ready to buy custom Inconel 783 (Alloy 783 / UNS R30783) forged parts? Contact our sales engineering team for a fast, professional response:
Company: Jiangsu Liangyi Forged Parts
Email: [email protected]
Phone / WhatsApp: +86-135-8506-7993
Product Page: https://www.jnmtforgedparts.com/inconel-783-alloy-783-uns-r30783-forged-parts.html
Website: https://www.jnmtforgedparts.com
Address: Chengchang Industry Park, Jiangyin, Jiangsu, China 214400
Certifications: ISO 9001:2015 · AS9100 Rev D · PED 2014/68/EU
Jiangsu Liangyi Forged Parts – Professional Inconel 783 (Alloy 783 / UNS R30783) forging manufacturer and supplier from China, serving aerospace, oil & gas, power generation and petrochemical customers worldwide since 2008.
There are many forging suppliers in China, The below points make Jiangsu Liangyi stand out in the Inconel 783 (UNS R30783) projects:
Forging nickel-cobalt alloys including Inconel 783 since 2008. Our engineers have direct experience with AMS 5839 and ASTM B905 heat treatment and inspection requirements.
Aerospace-grade quality system fully implemented. Approved for aerospace & defense supply chains. Full FAIR (First Article Inspection Report) available.
Inconel 783 forgings delivered to the USA, Germany, UAE, India, South Korea and 25+ more countries. Export documentation & customs support included.
No outsourced testing. UT, MT, PT, chemical analysis and mechanical testing all made in our own lab for faster turnaround and cost control.
We support prototypes and qualification programs. No minimum order quantity — from single prototype rings to multi-ton production runs.
Submit your drawing and receive a detailed technical + commercial quotation within 24 hours on standard Inconel 783 forging requests.
We have supplied Inconel 783 (Alloy 783 / UNS R30783) forged parts to customers in 30+ countries across aerospace, oil & gas, power generation and petrochemical industries. Here are what some of our clients say:
"We have worked with Jiangsu Liangyi for three aerospace programs. Their Inconel 783 ring forgings consistently meet AMS 5839 size tolerances and all EN 10204 3.1 MTR documentation is delivered alongside the parts. Lead time on our last order was 25 days — ahead of the agreed schedule."
Senior Procurement Engineer, Aerostructures Division, a Leading USA Aerospace Company
"Our HPHT wellhead project required Inconel 783 forged valve bodies that are fully accordance with NACE MR0175 / ISO 15156. Jiangsu Liangyi provided full chemistry, hardness and impact test reports, and the parts passed our third-party BV inspection without any NCR. We will continue to source from them for future sour-service uses."
Materials & Corrosion Engineer, Subsea Equipment Group, a Leading Norway Oil & Gas Company
"Jiangsu Liangyi provided customized Inconel 783 forged discs for our industrial gas turbine upgrading and transformation project. Its quality, dimensional accuracy and delivery time all exceeded our expectations. Their engineering team also provided useful technical support regarding heat treatment parameters during the evaluation stage."
Chief Mechanical Engineer, Power Plant Engineering, a Leading Indian Power Generation Company