Products Description
Product Specifications
| Standards | ASTM B444 |
| Steel Grades | Inconel Alloy 625/UNS N06625/WNR 2.4856 |
| Equivalent Grades | Alloy 625, Nickel 625, NiCr22Mo9Nb |
| Outer Diameter (OD) | 3 mm –380 mm |
| Wall Thickness (WT) | 0.5 mm – 20 mm |
| Length | 6/12m,customizable |
| Surface Treatment | Bright Annealed |
| Production Process | Cold Drawn / Cold Rolled |
| Condition | Solution Annealed |
Inconel Alloy 625 tubing boasts a PREN (Pitting Resistance Equivalent Number) of ≥45-far exceeding that of 316L-and exhibits virtually no susceptibility to pitting corrosion, crevice corrosion, or stress corrosion cracking in seawater and salt-spray environments. Consequently, it offers long-term durability against the harsh conditions of deep-sea salt spray, tidal scouring, and continuous seawater immersion.
UNS N06625 is designed for long-term service at temperatures ranging from 950°C to 980°C and is capable of withstanding extreme temperatures of 1050°C to 1100°C for short durations. Furthermore, it demonstrates excellent weldability, enabling the use of standard welding techniques-such as TIG and submerged arc welding-without the need for post-weld heat treatment. Compared to Hastelloy C-276, it presents lower processing difficulty and offers distinct cost advantages.
Customized Services
- TORICH supports custom specifications for outer diameter and wall thickness, as well as the fabrication of specialized bends-such as U-shaped and L-shaped configurations-and coiled tubing (available in lengths of up to 300 meters).
- Tailored heat treatment processes can be customized to meet specific operational temperature requirements, including annealing, solution annealing, and stress-relieving annealing.
- End finishes can be customized to feature various forms-such as bevels, plain ends, or threads-with specific bevel angles (e.g., 30°, 45°, etc.) available upon request.
Chemical Composition
| Element | Ni | Cr | Mo | Nb+Ta | Fe | C | Mn | Si | Al | Ti | P | S |
| Composition (%) | ≥58 | 20.0–23.0 | 8.0–10.0 | 3.15–4.15 | ≤5.0 | ≤0.10 | ≤0.50 | ≤0.50 | ≤0.40 | ≤0.40 | ≤0.015 | ≤0.015 |
Mechanical Properties
| Property | Tensile Strength | Yield Strength (0.2% Offset) | Elongation | Hardness |
| Value | ≥ 827 MPa | ≥ 414 MPa | ≥ 30% | ≤ 92 HRB |
Possible Alternative Grades
- UNS S32750 / S32760 super duplex stainless steels exhibit excellent corrosion resistance in ambient-temperature seawater; their cost is approximately 40–50% that of Inconel 625, and they are suitable for use at temperatures not exceeding 250°C.
- Grade 2 titanium alloy is lighter than Inconel 625 and is suitable for applications where weight is extremely critical or where fluid flow velocities are exceptionally high.
- 316L stainless steel is suitable for applications in shallow-water or low-salt-mist environments-such as rainwater drainage and ventilation ductwork on offshore platforms-and is priced at only about one-third the cost of Inconel 625.
application areas
- Offshore Oil & Gas Platforms: Seawater Cooler Tube Bundles, Platform Firewater Systems, Subsea Pipelines & Riser Linings
- Ships & Submarines: Propulsion System Shaft Sleeves, Seawater Intake Piping, Heat Exchangers, Exhaust Piping
- Desalination: Multi-Stage Flash (MSF) Heater Tubes, Reverse Osmosis (RO) High-Pressure Piping
- Marine Instrumentation: Deep-Sea Sensor Housings, Underwater Connectors, Sonar Equipment Structural Components
- Offshore Auxiliary Equipment: Tidal Energy Turbine Piping, Offshore Wind Power Cooling Systems
Products Show
Testing Equipment
Factory Equipment
Pickling equipment
Products Package
FAQ
Q: Can Inconel 625 tubing be used in acidic environments containing H₂S and CO₂?
A: Yes. This material complies with all requirements of the NACE MR0175 / ISO 15156 standard for sour service environments and is suitable for use in offshore sour oil and gas fields.
Q: How does one choose between ASTM B444 Grade 1 and Grade 2?
A: Grade 1 (annealed condition) offers higher strength and is suitable for general marine engineering applications at temperatures ≤593°C; Grade 2 (solution-annealed condition) is used for high-temperature service conditions exceeding 593°C, such as in engine exhaust systems.
Q: What are its welding characteristics, and what precautions should be taken during field welding?
A: It exhibits excellent weldability and can be joined using conventional welding methods, such as Gas Tungsten Arc Welding (GTAW) or Submerged Arc Welding (SAW). Preheating is generally not required; the interpass temperature should be maintained below 150°C, and post-weld heat treatment is not necessary.
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