Inconel 625 (UNS N06625) is a Ni-Cr alloy strengthened mainly by molybdenum and niobium in solid solution. It reaches high strength without ageing heat treatment and offers a balanced combination of oxidation and corrosion resistance plus fatigue strength, making it one of the most widely used nickel alloys in offshore, chemical, nuclear and aerospace service.
As a manufacturer and global exporter of special alloys since 2012, Shanghai Hangbo Alloy Group Co., Ltd. supplies Inconel 625 as round bars (φ2–600 mm, up to 12 m), plates & sheets (0.5–100 mm thick, up to 2500 mm wide), seamless tubes & pipes (φ6–630 mm OD, 0.5–40 mm wall), precision strip (0.02–3.0 mm, ±0.005 mm tolerance), welding wire & coils (1.0–5.0 mm), forgings & rolled rings (up to 7500 kg, 3500 mm OD), flanges & pipe fittings (Class 150–2500, DN15–DN1200) — all with EN 10204 3.1 certified material test reports.
Inconel 625 Chemical Composition (wt%)
| Element | Content (wt%) | Element | Content (wt%) |
|---|---|---|---|
| Ni (镍) | ≥ 58.0 | Ti (钛) | ≤ 0.40 |
| Cr (铬) | 20.0–23.0 | C (碳) | ≤ 0.10 |
| Mo (钼) | 8.0–10.0 | Mn (锰) | ≤ 0.50 |
| Nb+Ta (铌+钽) | 3.15–4.15 | Si (硅) | ≤ 0.50 |
| Fe (铁) | ≤ 5.0 | P (磷) | ≤ 0.015 |
| Co (钴) | ≤ 1.00 | S (硫) | ≤ 0.015 |
| Al (铝) | ≤ 0.40 |
Inconel 625 Mechanical Properties
| Property | Value |
|---|---|
| Tensile strength (Rm) | ≥ 830 MPa |
| Yield strength (Rp0.2) | ≥ 414 MPa |
| Elongation (A) | ≥ 30 % |
| Hardness | ≤ 200 HB |
| Density | 8.44 g/cm³ |
| Melting range | 1290–1350 °C |
| Thermal conductivity | 9.8 W/m·K |
| Young's modulus | 205 GPa |
| Max service temperature | 980 °C |
Key Advantages
- Reaches ~830 MPa tensile in the annealed condition without ageing
- Resists pitting, crevice corrosion and chloride stress-corrosion cracking
- PREN typically above 45; strong in seawater and sour gas
- Complies with NACE MR0175 / ISO 15156 for sour oil and gas
- Excellent weldability with matched ERNiCrMo-3 filler
Relevant Standards
- ASTM B446
- ASTM B443
- ASTM B444
- ASTM B564
- AMS 5666
- NACE MR0175 / ISO 15156
- UNS N06625
Typical Applications
- Desalination and marine piping, pump shafts
- Flue-gas desulphurisation (FGD) systems
- Chemical reactors, heat exchangers and pickling equipment
- Nuclear and gas turbine piping systems
- Aero-engine exhaust systems and thrust reversers
- Sour oil and gas downhole tools and valves
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
How do I choose between Inconel 625 and Inconel 718?
They are strengthened differently. 625 relies on Mo and Nb in solid solution, keeps its corrosion resistance as welded without post-weld heat treatment, and suits corrosion service and welded fabrications such as piping, vessels and seawater systems. 718 is precipitation hardened by γ″/γ′ and reaches roughly 1400 MPa after ageing, suiting highly stressed parts such as turbine discs and fasteners. Pick 625 when corrosion dominates and 718 when strength dominates.
Does Inconel 625 need post-weld heat treatment?
Normally no. As a solid-solution alloy it has no age-hardening requirement after welding. For thick or highly restrained fabrications, a stress relief at 870–980 °C may be used, avoiding the 650–870 °C sensitising range where carbides precipitate.
What is the typical PREN of Inconel 625?
Using PREN = %Cr + 3.3×%Mo + 16×%N with typical Cr 21.5% and Mo 9%, the value is about 51. With niobium contribution and measured data, engineering practice places 625 PREN in the 45–52 range — well above 316L (about 26) and 904L (about 36).
What forms and sizes are available?
We supply Inconel 625 as round bars (φ2–600 mm, up to 12 m), plates & sheets (0.5–100 mm thick, up to 2500 mm wide), seamless tubes & pipes (φ6–630 mm OD, 0.5–40 mm wall), precision strip (0.02–3.0 mm, ±0.005 mm tolerance), welding wire & coils (1.0–5.0 mm), forgings & rolled rings (up to 7500 kg, 3500 mm OD), flanges & pipe fittings (Class 150–2500, DN15–DN1200). 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.