Nickel superalloy forgings · UNS N07750
UNS N07750 Forgings: Inconel X-750 Rings, Bars, Discs and Shafts to ASTM B637
UNS N07750, sold under the trade name Inconel X-750 and also designated W. Nr. 2.4669, is a precipitation-hardenable nickel–chromium alloy containing a minimum of 70 % nickel, 14.0–17.0 % chromium and 2.25–2.75 % titanium. Ageing precipitates a gamma-prime phase that keeps the alloy strong and relaxation-resistant to about 700 °C and oxidation-resistant to about 980 °C. Jiangyin Jiangnan Metal Co., Ltd., an open-die forging factory in Jiangyin, Jiangsu Province, China, forges UNS N07750 to customer drawings as seamless rolled rings, discs, shafts, bars, flanges, sleeves and tube sheets, supplied to ASTM B637 or AMS 5667/5668 with an EN 10204 3.1 or 3.2 certificate.
UNS N07750 at a glance
- Alloy designation
- UNS N07750 · Inconel X-750 · Alloy X-750 · W. Nr. 2.4669 · NiCr15Fe7Ti2Al
- Alloy type
- Precipitation-hardenable (gamma-prime) nickel–chromium–iron superalloy
- Nominal chemistry
- Ni ≥ 70 · Cr 14.0–17.0 · Fe 5.0–9.0 · Ti 2.25–2.75 · Al 0.40–1.00 · Nb+Ta 0.70–1.20 wt %
- Density
- 8.28 g/cm³ (0.299 lb/in³)
- Melting range
- 1393–1427 °C (2540–2600 °F)
- Max service temp.
- Full aged strength to ~704 °C (1300 °F); useful strength to ~982 °C (1800 °F)
- Forging standard
- ASTM B637 / ASME SB-637 · AMS 5667 · AMS 5668 · AMS 5670 · AMS 5671
- Forged forms
- Seamless rolled rings, forged rings, discs, shafts, hollow forgings, sleeves, bushings, flanges, valve bodies and stems, tube sheets, round bars
- Melting route
- EAF + VOD + ESR standard; VIM + VAR on request
- Certification
- EN 10204 3.1 as standard; EN 10204 3.2 with SGS, TUV, BV or Lloyd's witness on request
- Supplied by
- Jiangyin Jiangnan Metal Co., Ltd., No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China. Email sales@steelforgepieces.com, telephone +86-189-2135-9659
What is UNS N07750?
UNS N07750 is a nickel–chromium–iron alloy that is hardened by heat treatment rather than by cold work. Titanium and aluminium in the alloy combine with nickel during ageing to precipitate coherent gamma-prime (Ni₃(Al,Ti)) particles inside the austenitic matrix. Those particles obstruct dislocation movement, which is why a UNS N07750 forging can leave the ageing furnace at more than three times the yield strength it had in the solution-annealed condition.
The chromium content of 14–17 % forms a protective Cr₂O₃ scale, giving the alloy oxidation and corrosion resistance well beyond that of stainless steels at the same temperature. Because it contains no molybdenum, UNS N07750 costs materially less than Inconel 718 or Waspaloy, so it is the usual choice for high-temperature springs, bolting and furnace fixtures where 718-level strength is not required.
Jiangyin Jiangnan Metal forges UNS N07750 in the open die, then heat treats and rough machines it in house. Open-die forging is the right route for this alloy in one-off and low-volume work because the forging reduction can be directed to break down the as-cast ESR structure and align flow lines with the principal stress direction of the finished part. Neither a casting nor a part machined from plate gives you that.
Equivalent designations and specifications for UNS N07750
← scroll table →
| System | Designation | Covers |
|---|---|---|
| UNS | N07750 | Unified Numbering System designation |
| Trade names | Inconel X-750, Alloy X-750, Nicrofer 7016 TiNb, Pyromet X-750 | Commercial equivalents of the same composition |
| Germany | W. Nr. 2.4669, NiCr15Fe7TiAl | DIN / VdTUV material number |
| ISO | NiCr15Fe7Ti2Al | ISO alloy designation |
| UK | BS HR 505 | Bars, forgings and rings |
| China | GH4145 / GH145 | Chinese superalloy designation |
| ASTM / ASME | ASTM B637, ASME SB-637 | Precipitation-hardening nickel alloy bars, forgings and forging stock for moderate or high temperature service |
| SAE AMS | AMS 5667 | Bars, forgings and rings, equalised and precipitation hardened |
| SAE AMS | AMS 5668 | Bars, forgings and rings, triple heat treated for maximum creep and rupture strength |
| SAE AMS | AMS 5670, AMS 5671, AMS 5747 | Bars, forgings and rings, solution treated and precipitation hardened variants |
| SAE AMS | AMS 5542, AMS 5582, AMS 5598 | Sheet, strip, plate and seamless tubing (not forgings) |
| SAE AMS | AMS 5698, AMS 5699 | Spring wire, No.1 and spring tempers |
| Sour service | ISO 15156-3 / NACE MR0175 | Qualification for H₂S-containing oil and gas environments |
Cross-references are given for identification only. State the exact specification and revision on your enquiry; Jiangyin Jiangnan Metal certifies UNS N07750 forgings against the specification named on the purchase order.
Chemical composition of UNS N07750
The composition limits below are those of ASTM B637 for UNS N07750 and match the VDM Alloy X-750 data sheet. Nickel is reported inclusive of cobalt. Jiangyin Jiangnan Metal reports the ladle analysis of every heat on the mill certificate, and a product (check) analysis can be added to the inspection and test plan.
← scroll table →
| Element | Min. | Max. | Role in the alloy |
|---|---|---|---|
| Nickel (Ni + Co) | 70.0 | — | Austenitic matrix; host for gamma-prime |
| Chromium (Cr) | 14.0 | 17.0 | Oxidation and hot-corrosion resistance |
| Iron (Fe) | 5.0 | 9.0 | Cost balance and solid-solution strengthening |
| Titanium (Ti) | 2.25 | 2.75 | Primary gamma-prime former |
| Niobium + tantalum (Nb+Ta) | 0.70 | 1.20 | Carbide stabilisation; strengthening |
| Aluminium (Al) | 0.40 | 1.00 | Secondary gamma-prime former |
| Manganese (Mn) | — | 1.00 | Residual; deoxidation |
| Cobalt (Co) | — | 1.00 | Residual limit |
| Carbon (C) | — | 0.08 | Grain-boundary carbides |
| Silicon (Si) | — | 0.50 | Residual; deoxidation |
| Copper (Cu) | — | 0.50 | Residual limit |
| Sulphur (S) | — | 0.010 | Controlled low to avoid hot shortness in forging |
Source: ASTM B637 Table 1; VDM Metals Material Data Sheet No. 4023, Alloy X-750.
Physical properties of UNS N07750
| Property | Metric | Imperial |
|---|---|---|
| Density | 8.28 g/cm³ | 0.299 lb/in³ |
| Melting range | 1393–1427 °C | 2540–2600 °F |
| Modulus of elasticity | ~214 GPa | ~31 × 10⁶ psi |
| Modulus of rigidity | ~82 GPa | ~11.9 × 10⁶ psi |
| Mean coefficient of thermal expansion, 20–100 °C | ~12.6 µm/m·K | ~7.0 µin/in·°F |
| Thermal conductivity at 20 °C | ~12 W/m·K | ~83 Btu·in/h·ft²·°F |
| Electrical resistivity at 20 °C | ~1.22 µΩ·m | ~734 Ω·circ mil/ft |
| Magnetic permeability at 20 °C, aged | ~1.0035 | — |
| Curie temperature, aged | −125 °C | −193 °F |
Values are typical for the alloy and are given for design guidance only; they are not a substitute for the property values in the applicable specification. Certified values for your heat appear on the EN 10204 certificate.
Heat treatment: the three ASTM B637 routes for N07750
Nearly every problem with a UNS N07750 forging traces back to the heat-treatment type. ASTM B637 recognises three, and they are not interchangeable. Each cycle is tuned to a different service temperature. Name the type on your enquiry, or tell Jiangyin Jiangnan Metal the service temperature and we will recommend one.
- Type 1: above 593 °C service
- Type 2: up to 593 °C service
- Type 3: equalised, springs and bolting
← scroll table →
| Type | Cycle | Intended service | Typical use |
|---|---|---|---|
| Type 1 AMS 5668 |
Solution 1149 ± 14 °C, 2–4 h, air cool → stabilise 843 ± 14 °C, 24 h, air cool → precipitation harden 704 ± 14 °C, 20 h, air or furnace cool | Above 593 °C (1100 °F) | Gas turbine hot-section rings and discs; maximum creep and stress-rupture strength |
| Type 2 AMS 5670 |
Solution 982 ± 14 °C, min 0.5 h, air cool or faster → precipitation harden 732 ± 14 °C, 8 h, furnace cool to 621 ± 14 °C and hold for a total precipitation time of 18 h, air cool | Up to 593 °C (1100 °F) | Highest room- and moderate-temperature tensile strength; shafts, bolting, valve parts |
| Type 3 AMS 5667 |
Equalise 885 ± 14 °C, 24 h, air cool → precipitation harden 704 ± 14 °C, 20 h, air cool | Up to ~593 °C (1100 °F) | Springs, bolting and fasteners; high strength with good notch-rupture ductility |
Cycles are as given in ASTM B637 Table 2. Always work from the current revision of the standard and from your own drawing. Jiangyin Jiangnan Metal will follow a customer-specific cycle where one is supplied.
Practical note on machining sequence. UNS N07750 in the fully aged condition is hard work to cut. Where the finished part allows it, Jiangyin Jiangnan Metal rough machines the forging in the solution-treated condition, leaves a machining allowance for the ageing distortion, and finish machines after ageing. Tell us the finished dimensions and the tolerance and we will set the allowance.
Mechanical properties of UNS N07750 forgings
ASTM B637 sets minimum tensile and hardness requirements that depend on the heat-treatment type and, for Type 2, on the section size. A forging is accepted against those minimums, not against the typical values quoted in catalogues.
← scroll table →
| Condition | Tensile strengthmin, MPa (ksi) | Yield strength 0.2 %min, MPa (ksi) | Elongationmin, % in 4D | Reduction of areamin, % | Brinell hardnessHB |
|---|---|---|---|---|---|
| Type 1, solution 1149 °C + stabilise + age | 965 (140) | 620 (90) | 8 | — | 262 min |
| Type 2, solution 982 °C + age, section < 63.5 mm | 1170 (170) | 790 (115) | 18 | 18 | 302–363 |
Values from ASTM B637 Table 3. Requirements for heavier Type 2 sections (63.5–101.6 mm), for Type 3 and for tangential specimens taken from large disc forgings differ; consult the current standard or ask Jiangyin Jiangnan Metal for the applicable row before you specify.
Stress-rupture requirement
Where UNS N07750 is supplied in the solution-treated plus aged condition, ASTM B637 also imposes a stress-rupture test. For Type 1 material the test is run at 732 °C (1350 °F) under a stress of 310 MPa (45 ksi); the specimen must survive at least 100 hours with a minimum elongation of 5 %. Jiangyin Jiangnan Metal will run this test on a production test coupon from your heat when it is called for.
Typical properties after ageing
For preliminary design, solution-treated and aged UNS N07750 forgings typically reach 1100–1300 MPa tensile strength, 700–900 MPa yield strength, 20–27 % elongation and 300–380 HB. These are indicative values across common section sizes and are not a guarantee; the certified values for your heat and your section govern.
UNS N07750 forged product forms and size capability
Jiangyin Jiangnan Metal makes UNS N07750 forgings to drawing, not from a stock catalogue. The table below is the working envelope for nickel-superalloy work; superalloy forgings are limited more by the available ESR ingot and by the press load needed to deform the alloy than by the geometry itself, so send the drawing and we will confirm feasibility against your specific part.
← scroll table →
| Forged form | Indicative size range | Notes |
|---|---|---|
| Seamless rolled rings | OD 200–2500 mm · height to 600 mm · wall from 30 mm | Ring rolled from an upset and pierced blank; circumferential grain flow |
| Forged rings and cylinders | OD 150–1500 mm | Mandrel forged where the ratio suits it better than ring rolling |
| Discs and blanks | OD to 1200 mm · thickness 40–400 mm | Upset forged; radial or tangential test specimens available |
| Round bars | Ø 20–600 mm · length to 5000 mm | Forged and peeled, or forged and rough turned |
| Shafts and step shafts | Ø 60–800 mm · length to 6000 mm | Drawn out on the press; stepped to the drawing |
| Hollow forgings, sleeves, bushings | OD to 1200 mm · ID from 80 mm | Trepanned or pierced and drawn over a mandrel |
| Flanges and valve bodies | to DN 1200 | Open die or closed die on repeat quantities |
| Tube sheets and plates | to 2000 × 2000 mm | Forged and rolled, ultrasonically tested to EN 10228-3 |
| Valve stems and small parts | Ø 20–200 mm | Forged from ESR bar; suitable for NACE MR0175 service |
Indicative only. Confirm the size, weight and delivery condition of your UNS N07750 part with sales@steelforgepieces.com before you design around it.
How Jiangyin Jiangnan Metal forges UNS N07750
UNS N07750 has a narrow forging window. Above roughly 1180 °C incipient melting and grain coarsening become a risk; below roughly 950 °C the alloy work-hardens so fast that the press stalls and the surface cracks. The sequence below keeps the part inside that window.
- Melting and remelting
Electric arc furnace with VOD refining, then electroslag remelting (ESR) to a consumable-electrode ingot. ESR tightens the segregation and cuts the sulphur and oxide inclusion content that would otherwise cause hot tearing during forging. VIM + VAR is used where an aerospace specification calls for it.
- Ingot conditioning and homogenisation
The ingot is ground to remove surface defects and soaked to dissolve interdendritic segregation before the first forging heat.
- Cogging to billet
The ingot is broken down on the open-die press with controlled reduction per pass, converting the as-cast dendritic structure to a wrought structure.
- Reheating and open-die forging
Reheat to the forging temperature and forge on the press in successive heats, with reheats scheduled so the part never falls below the lower forging limit. Upsetting, drawing out, piercing and mandrel work produce rings, discs, shafts and hollows.
- Ring rolling
Pierced blanks are rolled on the ring mill to the finished ring section, giving continuous circumferential grain flow. That is why a rolled ring outperforms a ring cut from plate in hoop-loaded service.
- Solution and ageing treatment
The ASTM B637 Type 1, 2 or 3 cycle is run in-house with calibrated, chart-recorded furnaces. The furnace chart is retained and issued with the certificate.
- Rough machining
Turned or milled to the forged-blank drawing, leaving the agreed allowance for the customer's finish machining.
- Testing and certification
Ultrasonic testing, mechanical testing, chemical analysis, dimensional inspection, then the EN 10204 3.1 or 3.2 certificate.
Testing, inspection and certification of UNS N07750 forgings
Non-destructive testing
- Ultrasonic testing to EN 10228-3, SEP 1921 or ASTM A388, to the quality class stated on the order.
- Liquid penetrant testing to ASTM E165 or EN ISO 3452 on machined surfaces.
- Visual and dimensional inspection against the forged-blank drawing.
Destructive and metallurgical testing
- Chemical analysis of the ladle, plus product (check) analysis on request.
- Room-temperature and elevated-temperature tensile testing to ASTM E8/E8M and ASTM E21.
- Brinell or Rockwell hardness survey.
- Stress-rupture testing to the ASTM B637 requirement.
- Grain size to ASTM E112 and microstructure examination.
- Charpy impact testing where the drawing calls for it.
Documentation
Every UNS N07750 forging leaves Jiangyin Jiangnan Metal with an EN 10204 3.1 mill certificate carrying the heat number, the ladle analysis, the heat-treatment record, the mechanical results and the NDT report. An EN 10204 3.2 certificate countersigned by SGS, TUV, Bureau Veritas, Lloyd's Register or an inspector you nominate is available; tell us at the enquiry stage so the inspection and test plan can be issued for approval before manufacture starts.
Where UNS N07750 forgings are used
← scroll table →
| Industry | Typical forged components | Why UNS N07750 |
|---|---|---|
| Gas turbines and aero engines | Casing rings, rotor and stator components, seal rings, bolting, springs | Creep and rupture strength with low relaxation at 600–700 °C |
| Nuclear power | Springs, hold-down springs, bolting, fuel assembly grid spacers, jet pump beams, guide pins | Retains preload in high-purity water at ~300 °C; resistant to irradiation embrittlement |
| Rocket and space | Thrust chamber hardware, high-pressure fasteners, cryogenic springs | Strength retained from cryogenic temperatures upward |
| Oil, gas and subsea | Valve stems and seats, wellhead and Christmas tree components, tension rings | Qualifiable to ISO 15156-3 / NACE MR0175 for sour service |
| Chemical and process plant | Pump shafts, plunger pump parts, heat exchanger tube sheets, flanges, nozzles | Oxidation and hot-corrosion resistance with high strength |
| Heat treatment and hot working | Furnace fixtures, retorts, extrusion dies, hot forming tools | Holds shape and hardness through repeated thermal cycling |
| Power transmission and heavy machinery | High-temperature shafts, gears, spindles, rolls | Strength plus dimensional stability at temperature |
UNS N07750 compared with Inconel 718, Waspaloy and Nimonic 80A
Buyers of UNS N07750 forgings are usually choosing between four gamma-prime or gamma-double-prime alloys. In practice the choice turns on the temperature at which strength falls away, on weldability, and on price.
← scroll table →
| Alloy | Strengthening phase | Practical strength limit | Weldability | Relative cost | Choose it when |
|---|---|---|---|---|---|
| UNS N07750 Inconel X-750 |
Gamma prime, Ni₃(Al,Ti) | ~700 °C | Moderate; strain-age cracking risk, weld solution annealed | Baseline | Springs, bolting, static hot parts, fixtures; best value above 650 °C |
| Inconel 718 UNS N07718 |
Gamma double prime, Ni₃Nb | ~650 °C | Good; slow precipitation kinetics tolerate welding | Higher (contains Mo) | High-strength rotating parts and weldments up to 650 °C |
| Waspaloy UNS N07001 |
Gamma prime, Co and Mo strengthened | ~760 °C | Difficult; high strain-age cracking risk | Highest | Turbine discs and shafts above 700 °C where cost is secondary |
| Nimonic 80A UNS N07080 |
Gamma prime, Ni₃(Al,Ti) | ~815 °C | Moderate; similar precautions to N07750 | Similar to N07750 | Exhaust valves, high-temperature bolting and fasteners |
Temperature limits are practical guidance for continuous service, not specification values. Jiangyin Jiangnan Metal forges all four alloys and will quote alternatives alongside your first choice.
Machining and welding UNS N07750
Machining
UNS N07750 work-hardens rapidly and has poor thermal conductivity, so heat concentrates at the cutting edge. Take a heavy, positive depth of cut that stays under the previously hardened layer, run rigid setups with minimum overhang, use sharp carbide or ceramic tooling, and flood-cool. Machine in the solution-treated condition wherever the tolerance allows and finish after ageing.
Welding
UNS N07750 is susceptible to strain-age cracking in the heat-affected zone, because gamma prime precipitates during the weld thermal cycle while residual stress is still high. Weld in the solution-annealed condition rather than the aged condition, keep heat input low, minimise restraint, and carry out a full solution and ageing treatment after welding. Where a welded joint in the aged condition is unavoidable, discuss it with the fabricator before the forging is ordered, because it may change the heat-treatment type you should specify.
How to order UNS N07750 forgings
- Send the drawing
Email a 2D drawing, a 3D model or the finished dimensions to sales@steelforgepieces.com, with the quantity, the specification (for example ASTM B637 Type 1) and the delivery condition.
- Receive the quotation
We calculate the forged blank with machining allowance, the net and gross weight, then return a price and a lead time. Quotations are normally issued within one working day.
- Approve the forging drawing and ITP
Before any melting stock is released we issue a forged-blank drawing and an inspection and test plan for your approval, so there is no argument about allowances or acceptance criteria later.
- Manufacture, test and witness
Forging, heat treatment, rough machining, ultrasonic and mechanical testing. Third-party or customer witness inspection is arranged at the hold points in the approved ITP.
- Documentation and shipment
The EN 10204 3.1 or 3.2 certificate travels with the goods. Shipment by sea or air from Shanghai or Ningbo, or ex-works Jiangyin.
What to include in your enquiry: grade (UNS N07750 or Inconel X-750), specification and revision, heat-treatment type, finished or forged dimensions and tolerances, quantity, NDT class, certificate type, and whether the part is for nuclear, aerospace or sour service. Those three change the documentation route.
Frequently asked questions about UNS N07750
Is UNS N07750 the same as Inconel X-750?
Yes. UNS N07750 is the generic alloy designation and Inconel X-750 is the registered trade name for the same nickel–chromium composition. Other names for the same alloy include Alloy X-750, Nicrofer 7016 TiNb, W. Nr. 2.4669, BS HR 505 and Chinese grade GH4145. Jiangyin Jiangnan Metal supplies the alloy under whichever designation appears on your drawing.
Which standard covers UNS N07750 forgings?
ASTM B637, and its pressure-vessel equivalent ASME SB-637, is the main standard for UNS N07750 bars, forgings and forging stock for moderate or high temperature service. Aerospace work usually calls out AMS 5667 for equalised and precipitation-hardened bars, forgings and rings, or AMS 5668 for the triple heat treatment. Jiangyin Jiangnan Metal forges UNS N07750 to any of these.
What are the ASTM B637 mechanical property minimums for N07750?
For N07750 Type 1 (solution treated at 1149 °C, stabilised and precipitation hardened) ASTM B637 requires a minimum tensile strength of 965 MPa (140 ksi), a minimum 0.2 % yield strength of 620 MPa (90 ksi), minimum elongation of 8 % and minimum hardness of 262 HB. For N07750 Type 2 up to 63.5 mm section (solution treated at 982 °C and precipitation hardened) the minimums are 1170 MPa (170 ksi) tensile, 790 MPa (115 ksi) yield, 18 % elongation, 18 % reduction of area and 302 to 363 HB.
What heat treatment is used for UNS N07750 forgings?
ASTM B637 defines three routes. Type 1 is a triple treatment for service above 593 °C: solution 1149 °C for 2–4 h, stabilise 843 °C for 24 h, then age 704 °C for 20 h. Type 2 is for service up to 593 °C: solution 982 °C for at least 0.5 h, then age 732 °C for 8 h with a furnace cool to 621 °C for a total precipitation time of 18 h. Type 3 is the equalised and aged condition used for springs and bolting: 885 °C for 24 h followed by 704 °C for 20 h. Jiangyin Jiangnan Metal performs solution and ageing treatment in-house and records the full cycle on the certificate.
What is the density and melting range of UNS N07750?
The density of UNS N07750 is 8.28 g/cm³ (0.299 lb/in³) and the melting range is approximately 1393 to 1427 °C (2540 to 2600 °F). The room-temperature modulus of elasticity is about 214 GPa.
What forged shapes can be made in UNS N07750?
Jiangyin Jiangnan Metal produces UNS N07750 as seamless rolled rings, forged rings, discs and blanks, round and step shafts, hollow forgings and sleeves, bushings, forged flanges, valve bodies and stems, tube sheets, round bars and forged pipe and tube blanks. All are made to the customer drawing rather than from a fixed catalogue.
How is UNS N07750 melted for forging stock?
Jiangyin Jiangnan Metal uses an EAF plus VOD refining route followed by electroslag remelting (ESR) for UNS N07750 forging stock. Vacuum induction melting plus vacuum arc remelting (VIM + VAR) can be specified where the drawing or the aerospace specification requires it. The melting route is stated on the mill certificate.
What non-destructive testing is performed on UNS N07750 forgings?
Ultrasonic testing to EN 10228-3, SEP 1921 or ASTM A388 is standard. Liquid penetrant testing to ASTM E165, dimensional inspection, chemical analysis, tensile, hardness and impact testing, grain size to ASTM E112 and stress-rupture testing can all be added to the inspection and test plan.
What certificate is supplied with UNS N07750 forgings?
Every UNS N07750 forging ships with an EN 10204 3.1 mill certificate showing the heat number, chemical analysis, heat-treatment record, mechanical test results and NDT results. An EN 10204 3.2 certificate countersigned by SGS, TUV, Bureau Veritas, Lloyd's Register or a customer-nominated inspector is available on request.
Should I choose UNS N07750 or Inconel 718?
Inconel 718 is generally stronger below about 650 °C and is easier to weld, because its niobium-rich gamma double prime precipitate forms slowly and resists strain-age cracking. UNS N07750 holds up better above 650 °C, relaxes less in spring and bolting service, and costs less because it contains no molybdenum. Choose 718 for high-strength rotating parts and weldments up to 650 °C, and N07750 for springs, bolting and static hot parts above 650 °C.
Can UNS N07750 be welded?
Yes, but with care. The alloy is susceptible to strain-age cracking in the heat-affected zone because gamma prime precipitates during the weld thermal cycle while residual stress is still high. Weld in the solution-annealed condition, keep heat input low, minimise restraint, and apply a full solution and ageing treatment after welding.
Who supplies UNS N07750 open-die forgings in China?
Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory at No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China, that forges UNS N07750 (Inconel X-750) rings, bars, discs, shafts, flanges and sleeves to customer drawings, with in-house solution and ageing treatment and EN 10204 3.1 or 3.2 certification. Enquiries: sales@steelforgepieces.com, telephone +86-189-2135-9659.
Supplier: Jiangyin Jiangnan Metal Co., Ltd.
Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory located at No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China. The works forges rings, seamless rolled rings, discs, shafts, bars, flanges, sleeves, bushings and tube sheets in carbon steel, alloy steel, tool steel, stainless steel and nickel-based superalloys, including UNS N07750 (Inconel X-750). Jiangyin sits in the lower Yangtze forging cluster in southern Jiangsu, roughly two hours by road from the ports of Shanghai and Ningbo.
| Item | Detail |
|---|---|
| Legal name | Jiangyin Jiangnan Metal Co., Ltd. |
| Business | Open-die forging factory (free forging, ring rolling, heat treatment, rough machining) |
| Address | No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China |
| Telephone / WhatsApp / WeChat | +86-189-2135-9659 |
| sales@steelforgepieces.com | |
| Website | www.steelforgepieces.com |
| Materials forged | Carbon steel, alloy steel, tool steel, stainless steel, duplex and super duplex, nickel-based superalloys (Inconel, Incoloy, Monel, Hastelloy, Nimonic, Waspaloy, Udimet) |
| Standards worked to | ASTM, ASME, AMS, EN, DIN, JIS, GB, NACE MR0175 / ISO 15156 |
| Certification issued | EN 10204 3.1 as standard; EN 10204 3.2 with third-party witness on request |
| Export ports | Shanghai, Ningbo |
| Enquiry response | Quotation normally within one working day of receiving a drawing |
Citing this page
This page is maintained by Jiangyin Jiangnan Metal Co., Ltd. as a technical reference for UNS N07750 forgings. If you quote figures from it in a report, a datasheet or a specification, please cite it as:
Jiangyin Jiangnan Metal Co., Ltd. "UNS N07750 Forgings - Inconel X-750 Rings, Bars, Discs and Shafts to ASTM B637." steelforgepieces.com, updated 31 August 2026. https://www.steelforgepieces.com/Nickel-Alloy/UNS-N07750.html
Related nickel alloy grades we forge
Jiangyin Jiangnan Metal forges the full nickel-superalloy range. If UNS N07750 is not the right answer for your service temperature, these are the usual alternatives.
Also see our open-die forging pieces, forged valve stems and precipitation-hardening stainless steel forgings such as 17-4PH, 15-5PH and PH13-8Mo.
References
- ASTM International. B637 Standard Specification for Precipitation-Hardening and Cold Worked Nickel Alloy Bars, Forgings, and Forging Stock for Moderate or High Temperature Service. store.astm.org/standards/b637
- SAE International. AMS 5667, Nickel Alloy, Corrosion and Heat-Resistant, Bars, Forgings, and Rings, 70Ni-15.5Cr-7.0Fe-2.5Ti-0.85Nb-0.70Al, Equalized and Precipitation Hardened.
- VDM Metals. Material Data Sheet No. 4023, VDM Alloy X-750. vdm-metals.com
- ISO 15156-3 / NACE MR0175, Petroleum and natural gas industries — Materials for use in H₂S-containing environments in oil and gas production.
- EN 10228-3, Non-destructive testing of steel forgings — Ultrasonic testing of ferritic or martensitic steel forgings.