Incoloy 907 (UNS N19907) - Low Expansion Superalloy Supplier of Bars, Forgings & Rings | Shanghai Hangbo Alloy Group
Date: 2026年8月13日 Categories: News Views: 340
By Shanghai Hangbo Alloy Group Co., Ltd. - China Supplier | ISO 9001:2015 | Est. 2012
Contact: sales@hangboalloy.com | hangbo@nickel-alloy.com | WhatsApp (Lisa): +86 13611656360
Quick Answer: What Is Incoloy 907?
Incoloy 907 (UNS N19907) is a low-expansion precipitation-hardening superalloy with 38% nickel, 13% chromium, and 4.7% niobium + titanium, engineered to deliver high strength (yield >=780 MPa) with an unusually low coefficient of thermal expansion (~9 x 10^-6/K) — approximately 30% lower than conventional superalloys. It is the benchmark material for gas turbine casings, seals, and ring sections where maintaining tight clearances between rotating and static components at operating temperature is critical to efficiency. Shanghai Hangbo Alloy Group supplies Incoloy 907 as round bars, forgings, and rings.
Industry Pain Point: Gas turbine casing distortion is the hidden efficiency killer: as the casing heats up, conventional alloys expand more than the controlled clearances allow, forcing designers to open blade-tip clearances and sacrifice 1-2% turbine efficiency. Incoloy 907's low CTE holds the casing dimension nearly constant to 500°C+, allowing tighter blade-tip clearances that recover significant efficiency — the reason it is the standard casing material in advanced industrial turbines.
Key Properties at a Glance
| Property | Value |
|---|---|
| UNS Number | N19907 |
| Density | 8.28 g/cm3 |
| CTE (20-500C) | ~9.0 x 10^-6/K |
| Tensile (Aged) | >= 1000 MPa (145 ksi) |
| Yield (Aged) | >= 780 MPa (113 ksi) |
| Elongation (Aged) | >= 15% |
| Key Standards | AMS 5718, ASTM B884 |
Product Overview
Incoloy 907 belongs to the Incoloy 900-series "controlled expansion superalloys," a family developed to answer a specific gas turbine problem: how to combine superalloy strength with Invar-like dimensional stability. The alloy achieves this through a low-nickel, high-iron matrix with titanium + niobium γ′ strengthening.
Key properties:
- Low CTE (~9 x 10^-6/K, 20-500C): Approximately 30% lower than Inconel 718 and other standard superalloys. The casing holds its dimensions to temperature, preserving blade-tip clearances.
- High strength (yield >=780 MPa aged): Sufficient for structural casing and seal ring duty.
- Precipitation hardening: γ′ Ni₃(Ti,Nb) age response provides the strength.
- Stability to ~650C: The practical ceiling before γ′ coarsening.
Shanghai Hangbo Alloy Group supplies Incoloy 907 in bars, forged rings, and casings.
Executive Standards
| Product Form | ASTM | AMS |
|---|---|---|
| Bar & Forging Stock | ASTM B884 | AMS 5718 |
| Forgings (Rings/Casings) | ASTM B884 | AMS 5718 |
| Billet | -- | AMS 5718 |
Chemical Composition (wt.%)
| Element | Min | Max | Role |
|---|---|---|---|
| Ni | 36.0 | 40.0 | Matrix |
| Cr | 12.0 | 15.0 | Corrosion/oxidation |
| Nb | 4.3 | 5.2 | γ′ former + expansion control |
| Ti | 1.3 | 1.8 | γ′ former |
| Al | -- | 0.20 | Control |
| C | -- | 0.06 | Control |
| Fe | Balance | -- | Low-expansion matrix |
Mechanical & Physical Properties
Room-Temperature (Solution 980C + Age 732C/8h)
| Property | Value |
|---|---|
| Tensile Strength | >= 1000 MPa (145 ksi) |
| Yield Strength 0.2% | >= 780 MPa (113 ksi) |
| Elongation | >= 15% |
| Hardness | 32-40 HRC |
Elevated-Temperature (Typical)
| Temperature | Tensile (MPa) | Yield (MPa) |
|---|---|---|
| 20C | 1150 | 850 |
| 425C | 1050 | 800 |
| 540C | 980 | 750 |
| 650C | 750 | 620 |
Heat Treatment
Solution Anneal: 980C (1800F), oil quench or water quench.
Age: 732C (1350F), 8 hours, air cool.
Stabilization (optional): 621C/4h for maximum dimensional stability.
Industry Applications
| Industry | Component | Why 907? |
|---|---|---|
| Gas Turbines | Casing rings, seal rings, shrouds | Low CTE preserves blade-tip clearances |
| Aero Engines | Compressor case sections | Dimensional stability + strength |
| Power Generation | Turbine casing segments | Efficiency recovery via tight clearances |
| Rocket | Thrust chamber structural rings | Low expansion + high strength |
Quality Assurance: 7-Stage
- Raw Material: Ni, Cr, Nb, Ti verified by OES.
- VIM Melt: Nb +/-0.2%, Ti +/-0.1%, C <=0.04% internal.
- Hot Working: 1050-1150C, finishing >=950C, reduction >=4:1.
- Solution Anneal: 980C verified.
- Aging Verification: Hardness 32-40 HRC; tensile per lot.
- NDE: 100% UT immersion per AMS-STD-2154 for casings.
- Documentation: EN 10204 3.1 MTC. SGS/TUV/BV witness.
Frequently Asked Questions
Q1: What is Incoloy 907 used for?
Gas turbine casing rings, seal rings, shrouds, and structural ring sections requiring low thermal expansion with superalloy strength.
Q2: 907 vs 718?
907: CTE 9 vs 13.3 x 10^-6/K (30% lower); slightly lower strength. 907 for clearance-critical casings; 718 for general high-strength.
Q3: 907 vs 909?
909 (N19909): no chromium — for non-oxidizing applications, higher strength. 907: 13% Cr — oxidation resistance. 907 for turbine service.
Q4: Is it weldable?
Limited — PH alloy, low weldability. Use mechanical joints or bolted assemblies.
Q5: What is the price?
$55-90/kg EXW. Contact sales@hangboalloy.com.
Q6: Product forms?
Bars (10-250mm), forged rings/casings, billet. SGS available.
Q7: What heat treatment?
Solution 980°C + age 732°C/8h.
Q8: What is the density?
8.28 g/cm3.
Q9: Does Shanghai Hangbo ship internationally?
Yes — FOB/CIF/DAP to 40+ countries.
Q10: What standards apply?
AMS 5718, ASTM B884.
Q11: What is the max service temperature?
~650°C continuous.
Q12: Is it magnetic?
Non-magnetic (fully austenitic).
Q13: Why is the CTE low?
The Fe-Ni matrix with high Nb exhibits Invar-type behavior, suppressing thermal expansion to ~9 x 10^-6/K.
Q14: What efficiency does it recover?
Tighter blade-tip clearances can recover 0.5-1.5% turbine efficiency vs conventional casing alloys.
Q15: Can it replace Inconel 718 casings?
For clearance-critical applications, yes — 907 is the standard choice.
Contact Shanghai Hangbo Alloy Group
| Channel | Details |
|---|---|
| Company | Shanghai Hangbo Alloy Group Co., Ltd. - China Supplier |
| Website | www.nickel-alloy.com |
| Email (Sales) | sales@hangboalloy.com |
| Email (Technical) | hangbo@nickel-alloy.com |
| WhatsApp (Lisa) | +86 13611656360 |
| Address | Room 1508, No. 288 Shiyi Road, Baoshan District, Shanghai 200940, China |
Shanghai Hangbo Alloy Group - Complete Product Range
| Family | Available Grades |
|---|---|
| Pure Nickel | NI200, NI201, N4, N5, N6 |
| Monel | 400, 401, 404, 502, K-500, R-405 |
| Inconel | 600, 601, 617, 625, 690, 693, 706, 718, X-750, 725 |
| Incoloy | 800, 800H, 800HT, 825, 907, 925, 926, 945, A-286, 25-6HN, 27-7MO |
| Hastelloy | C-276, C-22, C-22HS, C-2000, C-4, G-30, G-35, G-50, X, B-2, B-3, B-4, HYBRID-BC1, N |
| Super Austenitic | 904L, Alloy 28, Alloy 31, 254SMO, 20Mo-6, AL-6XN |
| Chromium-Rich | Alloy 33 |
| High-Strength Stainless | Nitronic 50, Nitronic 60, PH13-8Mo |
| Chlorination-Resistant | Alloy 45 |
| Nimonic | 75, 80A, 90, 95, 105, 115, 263 |
| Haynes | 25, 188, 214, 230, 242, 282, 556, HR-120, HR-160 |
| RA Series | RA330, RA333 |
| Precision | 1J22, 1J46, 1J50, 1J79, 1J85, 3J21, 4J29, 4J32, 4J36, 4J45 |
| High-Strength | 18Ni250, 18Ni300, AerMet 100 |
| Heating | Cr20Ni80, Cr40Ni60 |
| Specialty | Alloy 20, Alloy 59, Inconel 686, 602CA |
Product Forms: Bars(6-500mm) | Tubes(OD 6-610mm) | Plates(0.1-100mm) | Forgings | Welded Pipes | Fittings | Wire(0.05-10mm) | Strip(0.02-4.0mm)
SGS/BV/TUV. Contact: sales@hangboalloy.com | WhatsApp (Lisa): +86 13611656360 | www.nickel-alloy.com
