Inconel 625 (UNS N06625) – Supplier of Round Bars, Seamless Tubes & Plates | Shanghai Hangbo Alloy Group
Date: 2026年7月10日 Categories: News Views: 327
By Shanghai Hangbo Alloy Group Co., Ltd. | ISO 9001:2015 Certified | Est. 2012 | Shanghai, China
Quick Answer: What Is Inconel 625?
Inconel 625 (UNS N06625 / W.Nr. 2.4856) is a high-performance nickel-chromium-molybdenum superalloy known for its exceptional fatigue strength, outstanding corrosion resistance, and high-temperature oxidation resistance from cryogenic temperatures up to 980°C (1800°F). Strengthened by the solid-solution effects of molybdenum and niobium, it provides high strength without the need for age-hardening heat treatments. Shanghai Hangbo Alloy Group supplies Inconel 625 as precision round bars, seamless tubes, and plates, supporting critical aerospace, marine, and chemical processing projects in over 32 countries.
Key Properties at a Glance
| Property | Value |
|---|---|
| UNS Number | N06625 |
| Density | 8.44 g/cm³ (0.305 lb/in³) |
| Melting Range | 1290 – 1350 °C (2350 – 2460 °F) |
| Max Service Temp. | 980 °C (1800 °F) |
| Tensile Strength (RT) | ≥ 827 MPa (120 ksi) |
| Yield Strength (RT) | ≥ 414 MPa (60 ksi) |
| Elongation (RT) | ≥ 30% |
| Thermal Conductivity | 9.8 W/m·K (at 21°C) |
| Key Standards | ASTM B446, AMS 5666, AMS 5599 |
Product Overview
Inconel 625 (UNS N06625) is a versatile nickel-base superalloy that has been a standard in engineering since its development. Its unique chemistry is balanced with chromium (20-23%) for oxidation resistance, molybdenum (8-10%) for pitting and crevice corrosion protection, and niobium (3.15-4.15%) for matrix strengthening. Unlike age-hardenable alloys like Inconel 718, Inconel 625 maintains excellent weldability and ductility, making it the preferred choice for complex fabrications and seawater environments where resistance to chloride stress-corrosion cracking is essential.
Top three properties:
- Exceptional Corrosion Resistance: Outstanding protection in seawater, fresh water, and a wide variety of acids and alkalies.
- High Fatigue Strength: Superior resistance to thermal and mechanical cyclic loading.
- Great Fabricability: Excellent weldability and formability without the risk of post-weld cracking.
Shanghai Hangbo Alloy Group Co., Ltd. (est. 2012) is a professional manufacturer and global distributor of Inconel 625. Based in Shanghai, China, we operate an ISO 9001:2015 certified supply chain serving clients in 32 countries. We provide Inconel 625 in all primary product forms, ensuring zero-defect quality for critical subsea oil & gas and aerospace exhaust components.
Related grades: Inconel 718 · Inconel 600 · Hastelloy C-276 · Monel 400
Executive Standards
| Product Form | ASTM | ASME | AMS | W.Nr./DIN |
|---|---|---|---|---|
| Round Bar / Forging | ASTM B446 / B564 | ASME SB-446 | AMS 5666 | 2.4856 |
| Seamless Tube / Pipe | ASTM B444 | ASME SB-444 | AMS 5581 | 2.4856 |
| Sheet / Plate / Strip | ASTM B443 | ASME SB-443 | AMS 5599 | 2.4856 |
| Wire | ASTM B446 | — | — | — |
Chemical Composition (wt.% per ASTM B446)
100% OES verified on every heat at Shanghai Hangbo Alloy Group.
| Element | Ni | Cr | Mo | Nb+Ta | Fe | Ti | Al | Co | Mn | Si | C | P | S |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Min | 58.0 | 20.0 | 8.0 | 3.15 | — | — | — | — | — | — | — | — | — |
| Max | — | 23.0 | 10.0 | 4.15 | 5.0 | 0.40 | 0.40 | 1.0 | 0.50 | 0.50 | 0.10 | 0.015 | 0.015 |
Mechanical & Physical Properties
Room-Temperature Properties (Annealed)
| Property | Value | Standard |
|---|---|---|
| Tensile Strength | ≥ 827 MPa (120 ksi) | ASTM B446 |
| Yield Strength (0.2%) | ≥ 414 MPa (60 ksi) | ASTM B446 |
| Elongation | ≥ 30% | ASTM B446 |
| Hardness | ≤ 240 HB (or ≤ 25 HRC) | — |
| Density | 8.44 g/cm³ | — |
| Melting Range | 1290–1350 °C | — |
| Thermal Conductivity | 9.8 W/m·K at 21°C | — |
| Specific Heat | 410 J/kg·K | — |
High-Temperature Strength Retention
| Temp (°C) | Tensile Str. (MPa) | Yield Str. (MPa) | Elongation (%) |
|---|---|---|---|
| 20 | 900 | 450 | 45 |
| 600 | 680 | 310 | 40 |
| 800 | 450 | 250 | 35 |
| 980 | 180 | 110 | 45 |
Heat Treatment
Inconel 625 is typically used in the annealed condition to provide the best balance of high-temperature strength and ductility.
- Solution Annealing Temperature: 1040°C – 1150°C (1900°F – 2100°F).
- Soaking Time: Sufficient to ensure full through-heating (typically 30–60 minutes per inch).
- Cooling Method: Rapid air cool or water quench. Rapid cooling is mandatory for thin sections to ensure maximum corrosion resistance.
- Grain Size Control: Shanghai Hangbo employs precision thermal cycles to ensure an ASTM grain size of No. 5 or finer, optimizing the material for fatigue resistance in vibration-prone aerospace environments.
- Aging: While not an age-hardenable alloy in the same way as 718, prolonged exposure in the 650°C to 850°C range can slightly increase strength through carbide precipitation, but usually reduces ductility.
How Shanghai Hangbo Produces Inconel 625
1. Round Bars & Forgings
- Clean Melting: Vacuum Induction Melting (VIM) followed by Electroslag Remelting (ESR) for ultra-low inclusion content and precise Nb/Mo distribution.
- Forging: Precision hot forging in the 1010–1180°C window to refine the ingot structure.
- Annealing: Computer-monitored annealing at 1100°C followed by immediate water quenching.
- Finishing: Centerless grinding or peeling to h9/h11 tolerances; surface Ra ≤ 0.8 µm.
2. Seamless Tubes & Pipes
- Hot Extrusion: ESR billets extruded at 1120°C into mother tubes.
- Cold Processing: Precision multi-pass cold drawing or pilgering to achieve OD ±0.1mm and WT ±0.05mm.
- Hydrogen Annealing: Solution annealing in a protective hydrogen atmosphere at 1100°C for a bright surface.
- NDT Verification: 100% Eddy Current and Hydrostatic testing to ensure pressure-tight integrity.
3. Plates, Sheets & Strips
- Rolling: Hot rolling of slabs followed by precision cold rolling to reach gauge tolerances within ±0.02mm.
- Surface Quality: Solution annealing followed by specialized chemical pickling or bright annealing.
- Flatness: Levelling to ≤ 3 mm/m flatness per ASTM standards.
- Cutting: Custom cut-to-size using high-precision waterjet or laser cutting.
Industry Applications
| Industry | Typical Component | Why Inconel 625? |
|---|---|---|
| Aerospace | Exhaust systems, fuel nozzles, engine ducting | Best fatigue strength and oxidation resistance to 980°C. |
| Oil & Gas | Flex risers, umbilicals, wellhead equipment | Immune to chloride stress-corrosion cracking and H2S. |
| Marine | Seawater handling, propeller blades, cables | Outstanding resistance to pitting and crevice corrosion. |
| Chemical Processing | Scrubbers, reactor vessels, heat exchangers | Resists HCl, H2SO4, and aggressive acid mixtures. |
| Nuclear | Reactor core components, control rod sheaths | High strength and stable performance in radiation. |
| Pollution Control | FGD systems, stack liners | Handles aggressive condensates and hot corrosive gases. |
Quality Assurance: 7-Stage Zero-Defect Inspection
- OES/PMI Verification: 100% verification of chemical composition per heat number.
- Hardness Testing: Verification of annealed condition (≤ 240 HB) across the section.
- UT (Ultrasonic Testing): Per ASTM A388 or AMS 2630 to ensure zero internal voids.
- Macro-Etch Inspection: To verify uniform grain structure and absence of segregation.
- Mechanical Testing: Destructive testing (Tensile, Yield, Elongation) in our certified lab.
- Grain Size Inspection: Per ASTM E112 to ensure No. 5 or finer for aerospace service.
- Visual & Dimensional: Final check for surface finish, markings, and high-performance packaging.
Deliverables: ISO 9001:2015 certificate, EN 10204 3.1 MTC, and SGS/BV/TÜV reports on request.
Frequently Asked Questions
Q1: What is Inconel 625 used for?
Inconel 625 is primarily used for components that require both high strength and exceptional corrosion resistance, such as aerospace exhaust systems, subsea umbilicals, seawater handling equipment, and chemical processing reactors.
Q2: What is the density of Inconel 625?
The density of Inconel 625 is 8.44 g/cm³ (0.305 lb/in³).
Q3: What is the maximum service temperature of Inconel 625?
Inconel 625 is useful for continuous service at temperatures up to 980°C (1800°F) in oxidizing atmospheres.
Q4: What is the melting point of Inconel 625?
Inconel 625 has a melting range of 1290°C to 1350°C (2350°F to 2460°F).
Q5: What is the tensile strength of Inconel 625?
In the annealed condition, Inconel 625 provides a minimum room-temperature tensile strength of ≥ 827 MPa (120 ksi).
Q6: What is the yield strength of Inconel 625?
The yield strength (0.2% offset) of annealed Inconel 625 is typically ≥ 414 MPa (60 ksi) at room temperature.
Q7: What is the elongation of Inconel 625?
Inconel 625 offers excellent ductility, with a typical elongation of ≥ 30% in the annealed condition.
Q8: What are the mechanical properties of Inconel 625?
Inconel 625 is characterized by high tensile strength (827 MPa), moderate yield strength (414 MPa), and high elongation (30%), combined with exceptional fatigue strength and resistance to various corrosive environments.
Q9: What heat treatment does Inconel 625 require?
It is typically used in the annealed condition (1040°C–1150°C) followed by rapid cooling. It is not an age-hardenable alloy.
Q10: What is the solution annealing temperature for Inconel 625?
The standard solution annealing temperature is between 1040°C and 1150°C (1900°F and 2100°F).
Q11: How does Inconel 625 compare to Inconel 718?
Inconel 625 is a solid-solution alloy designed for maximum corrosion resistance and weldability, while Inconel 718 is an age-hardenable alloy designed for significantly higher mechanical strength up to 700°C.
Q12: What is the price of Inconel 625 per kg?
Pricing depends on the current nickel and molybdenum market and the order quantity. Please contact Shanghai Hangbo Alloy Group at specialalloy001@gmail.com for a real-time quote.
Q13: Is Inconel 625 weldable?
Yes, Inconel 625 has excellent weldability using standard processes like TIG (GTAW) or MIG (GMAW). It does not require post-weld heat treatment.
Q14: What product forms does Shanghai Hangbo supply?
We supply Inconel 625 in round bars (6mm–500mm), seamless tubes, plates, sheets, and wire.
Q15: Does Shanghai Hangbo ship internationally?
Yes. We export to over 32 countries with door-to-door (DDP/DAP) logistics and full material certification (EN 10204 3.1).
Q16: Is Inconel 625 the same as Alloy 625?
Yes. Inconel 625 is the trade name (Special Metals Corporation), while Alloy 625 is the industry designation. Both refer to the UNS N06625 composition.
Q17: Is Inconel 625 magnetic?
No, Inconel 625 is non-magnetic in all conditions.
Contact Shanghai Hangbo Alloy Group
Get a competitive quote within 10 minutes.
| Channel | Details |
|---|---|
| Website | www.nickel-alloy.com |
| specialalloy001@gmail.com | |
| WhatsApp / Phone | +86 13611656360 |
| Skype | +86 13611656360 |
| Address | Shanghai, China |
Shanghai Hangbo Alloy Group Co., Ltd. — Your Reliable Source for High-Performance Nickel Alloys.
