Inconel 625 Nickel Alloy Coil Tube
Product Overview
Wenzhou Jixing Metal Materials Co., Ltd. offers premium-grade Inconel 625 (UNS N06625) coil tube, a high-performance nickel-chromium-molybdenum-niobium alloy engineered for the most demanding industrial environments. Delivered in precise coil configurations, this product provides exceptional resistance to high-temperature oxidation, corrosion, and mechanical degradation under extreme conditions. The coil form factor enables efficient downstream processing—including bending, cutting, and forming—without the need for straight-length straightening, reducing material waste and production cycle times.
Material & Properties
Inconel 625 is a precipitation-hardenable, austenitic nickel-based superalloy whose composition is characterized by the following key elements:
- Nickel (Ni): Balances base (≥58%), providing inherent ductility, toughness, and resistance to thermal cracking.
- Chromium (Cr): 20–23%, forming a stable, self-healing chromium oxide layer that delivers outstanding resistance to oxidation and nitridation at elevated temperatures.
- Molybdenum (Mo): 8–10%, conferring superior resistance to reduction acids (hydrochloric, sulfuric) and stress-corrosion cracking in chloride-containing environments.
- Niobium (Nb): 4–7%, acting as a potent microstructural stabilizer and precipitation-hardening element that enhances creep strength and retains mechanical properties at temperatures up to 980 °C (1800 °F).
The synergistic combination of these alloying elements results in a material that maintains full tensile strength, fatigue resistance, and corrosion immunity across a temperature range from cryogenic (-270 °C) to approximately 1000 °C. Inconel 625 also exhibits excellent resistance to pitting, crevice corrosion, and intergranular attack, even after prolonged exposure to aggressive chemical media.
Specifications
| Parameter | Specification |
|---|---|
| Material Grade | Inconel 625 / UNS N06625 / ASTM B409 / EN 1.4876 |
| Chemical Composition (wt%) | Ni (balance), Cr 20–23, Mo 8–10, Nb 4–7, Fe ≤1.0, C ≤0.10 |
| Outer Diameter | 3.0 mm – 150.0 mm (customizable on request) |
| Wall Thickness | 0.3 mm – 6.0 mm (customizable on request) |
| Coil Length | Standard 50 m – 500 m; longer lengths available |
| Coil Inner Diameter | 150 mm – 1000 mm |
| Manufacturing Method | Seamless (hot-rolled / cold-drawn) or welded (butt-welded) |
| Surface Finish | Mill finish, pickled & passivated, or polished (Ra ≤ 0.4 μm available) |
| Temperature Range | -270 °C to +980 °C (continuous service) |
| Tensile Strength (Annealed) | ≥ 550 MPa (80 ksi) |
| Yield Strength (Annealed) | ≥ 240 MPa (35 ksi) |
| Elongation | ≥ 40% |
| Density | 8.44 g/cm³ |
| Standards Referenced | ASTM B409, ASTM B463, ASME SB-409, EN 10217-7, AMS 5663 |
Manufacturing Process
Inconel 625 coil tubes from Wenzhou Jixing Metal Materials Co., Ltd. are produced through a rigorously controlled multi-stage process:
- Virgin Material Selection: Only certified, low-carbon, low-impurity nickel master alloys and refined intermediates are sourced to ensure consistent metallurgical quality and minimize harmful inclusions.
- Hot Rolling & Extrusion: Billets are homogenized at 1150–1250 °C and subsequently hot-rolled or hot-extruded into seamless tube blanks with tight dimensional tolerances.
- Cold Drawing / Cold Rolling: Tubes are cold-worked to achieve precise final dimensions, improved surface finish, and enhanced mechanical properties. Multi-pass drawing ensures uniform wall thickness and consistent grain structure.
- Solution Annealing: Tubes are furnace-annealed at 1090–1150 °C followed by controlled water quenching to dissolve carbides, eliminate residual stresses, and restore full ductility and corrosion resistance.
- Coiling & Straightening: The annealed tube is wound into coils of specified diameter and length on precision coiling equipment, ensuring uniform winding tension and minimal mechanical deformation.
- Surface Treatment: Tubes undergo pickling and passivation to remove scale, oxidation, and surface contaminants, leaving a chemically active, corrosion-resistant chromium oxide film.
- Non-Destructive Testing (NDT): Every coil is subjected to 100% eddy-current testing, hydrostatic pressure testing, and visual inspection to detect internal and surface defects.
Applications
The exceptional combination of high-temperature strength, oxidation resistance, and multi-acid corrosion immunity makes Inconel 625 coil tube indispensable across several critical industries:
Aerospace
- Jet engine exhaust manifolds, ducting, and combustion chamber components
- Aircraft hydraulic and fuel system tubing operating under extreme thermal cycling
- Turbine blade root platforms and hot-section fasteners
Flue Gas Desulfurization (FGD)
- Flue gas ducting, absorber internals, and spray nozzles in power plant FGD systems
- Resistance to wet sulfuric and sulfurous acid environments at elevated temperatures
- Long service life in highly corrosive SO₂/SO₃-laden atmospheres
Acidic Oil & Gas Wells
- Downhole tubing and casing in sour (H₂S-containing) wells with high chlorides and carbonic acid
- Resistant to stress-corrosion cracking (SCC) in chloride-bearing brines at elevated temperatures
- Heat exchangers and process piping in upstream and midstream facilities
Additional Applications
- Chemical processing reactors, distillation columns, and heat exchanger tubes
- Nuclear waste handling and reprocessing equipment
- Medical implants and surgical instruments requiring biocompatibility
- Marine and offshore platforms in seawater environments
Quality Certifications & Compliance
Wenzhou Jixing Metal Materials Co., Ltd. maintains a comprehensive quality management system aligned with international standards:
- ISO 9001:2015 — Quality Management System certification ensuring consistent production quality and continuous improvement.
- ISO 14001:2015 — Environmental Management System certification demonstrating responsible manufacturing practices.
- ISO 45001:2018 — Occupational Health and Safety Management System certification.
- EN 10204 Type 3.1 — Third-party inspected material test certificates for every shipment.
- NACE MR0175 / ISO 15156 — Compliance for sour service applications in oil and gas.
- NADCAP (pending/applicable) — Special Process certification for aerospace-grade manufacturing.
Each coil is accompanied by a full material traceability package including mill test certificates (MTC), chemical analysis reports, mechanical test results, and NDT documentation, ensuring complete compliance with customer specifications and applicable international codes.
Why Choose Wenzhou Jixing Metal Materials Co., Ltd.?
- Direct manufacturer with vertically integrated production — from raw material to finished coil — ensuring full supply chain control and competitive pricing.
- Custom dimensions, lengths, and surface finishes available to meet specific project requirements.
- Strict adherence to ASTM, ASME, EN, and AMS standards with third-party verification.
- Technical support team available for material selection, welding procedure qualification, and corrosion assessment.
- Global shipping capability with protective packaging and export documentation.