Inconel 725 (UNS N07725) combines the corrosion resistance of Inconel 625 with age-hardening strength — roughly twice the yield of 625 — making it the preferred choice for sour downhole tools, high-strength fasteners and valve stems.
As a manufacturer and global exporter of special alloys since 2012, Shanghai Hangbo Alloy Group Co., Ltd. supplies Inconel 725 as round bars (φ2–600 mm, up to 12 m), plates & sheets (0.5–100 mm thick, up to 2500 mm wide), forgings & rolled rings (up to 7500 kg, 3500 mm OD), machined parts to your drawings — all with EN 10204 3.1 certified material test reports.
Inconel 725 Chemical Composition (wt%)
| Element | Content (wt%) | Element | Content (wt%) |
|---|---|---|---|
| Ni (镍) | 55.0–59.0 | Fe (铁) | Balance |
| Cr (铬) | 19.0–22.5 | Al (铝) | ≤ 0.35 |
| Mo (钼) | 7.0–9.5 | C (碳) | ≤ 0.03 |
| Nb (铌) | 2.75–4.00 | Mn (锰) | ≤ 0.35 |
| Ti (钛) | 1.00–1.70 | Si (硅) | ≤ 0.20 |
Inconel 725 Mechanical Properties
| Property | Value |
|---|---|
| Tensile strength (Rm) | ≥ 1137 MPa (aged) |
| Yield strength (Rp0.2) | ≥ 827 MPa (aged) |
| Elongation (A) | ≥ 20 % |
| Hardness | ≥ 32 HRC |
| Density | 8.31 g/cm³ |
| Melting range | 1271–1343 °C |
| Thermal conductivity | 10.6 W/m·K |
| Young's modulus | 204 GPa |
| Max service temperature | 650 °C |
Key Advantages
- Age-hardened yield around 827 MPa, about twice that of 625
- Retains 625-class pitting and crevice corrosion resistance
- Meets NACE MR0175 for the most severe sour service levels
- Resistant to hydrogen embrittlement and sulphide stress cracking
Relevant Standards
- ASTM B805
- NACE MR0175 / ISO 15156
- UNS N07725
Typical Applications
- Sour oil and gas downhole tools, packers and hangers
- High-strength valve stems, fasteners and lifting gear
- High-strength shafts for corrosive chemical service
- Offshore mooring and tensioner components
Why Buy from Hangbo Alloy?
- Factory-direct manufacturer — founded 2012, headquartered in Shanghai Qingpu
- Full product range — bar, plate, sheet, strip, tube, forging, welding wire, flanges and machined parts
- Certified quality — ISO 9001:2015, GB/T 19001-2016, GJB 9001C-2017, EN 10204 3.1 mill test certificates with third-party inspection (SGS / BV / TUV) available on request
- Complete mill documentation — chemical analysis, mechanical test, ultrasonic test (UT), hardness and grain-size reports with every shipment
Contact Us — Shanghai Hangbo Alloy Group Co., Ltd.
Shanghai Hangbo Alloy Group Co., Ltd.
📍 No. 388 Songhuang Road, Qingpu District, Shanghai, China
📞 Tel / WhatsApp: +86 15618279078
✉️ Email: demi@nickel-alloy.com
🕒 Available 24 hours a day, 7 days a week — enquiries answered around the clock.
Send your drawing or enquiry (grade, form, size, quantity, standard) for a same-day quotation.
Frequently asked questions
What advantage does Inconel 725 have over 718?
725 carries more chromium and molybdenum (Cr 19–22.5%, Mo 7–9.5%), so it is clearly more corrosion resistant than 718 while ageing to comparable strength via Ti and Nb. Where NACE MR0175 sour compliance and 718-class strength are both required, 725 is the stronger answer.
What forms and sizes are available?
We supply Inconel 725 as round bars (φ2–600 mm, up to 12 m), plates & sheets (0.5–100 mm thick, up to 2500 mm wide), forgings & rolled rings (up to 7500 kg, 3500 mm OD), machined parts to your drawings. Custom lengths, tolerances and machining to drawing are available on request.
What is the MOQ and lead time?
MOQ is flexible — trial orders from a single piece are welcome. Stock sizes ship in 3–7 days; custom forgings and machined parts typically 15–35 days depending on quantity and process.
Can you provide third-party inspection and shipping to my port?
Yes. SGS / BV / TUV or your nominated inspector can witness all tests before shipment. Full export documentation is provided, and we ship worldwide by sea or air on FOB, CIF or DDP terms.