Views: 222 Author: Robert Publish Time: 2025-04-27 Origin: Site
Content Menu
● What Is Duplex 2205 Capillary Tubing?
● The Production Process of Duplex 2205 Capillary Tubing in China
>> 1. Raw Material Selection and Melting
>> 3. Tube Forming and Welding
>> 4. Cold Drawing and Annealing
>> 5. Straightening, Cutting, and Finishing
>> 6. Quality Control and Testing
● Characteristics and Specifications of Duplex 2205 Capillary Tubing
● Applications of Duplex 2205 Capillary Tubing
● Advantages of Choosing a Duplex 2205 Capillary Tubing Manufacturer in China
>> Customization and Flexibility
● Frequently Asked Questions (FAQs)
>> 1. What makes Duplex 2205 capillary tubing superior to other stainless steels like 316L?
>> 3. How do Chinese manufacturers ensure the quality of Duplex 2205 capillary tubing?
>> 4. What industries commonly use Duplex 2205 capillary tubing?
>> 5. Can Duplex 2205 capillary tubing be customized in terms of length, diameter, and surface finish?
Duplex 2205 capillary tubing is a specialized stainless steel product widely used in industries requiring high corrosion resistance and mechanical strength, such as oil and gas, chemical processing, and instrumentation. China, as a global manufacturing hub, has become a leading producer of Duplex 2205 capillary tubing, offering high-quality products at competitive prices. This article explores the detailed production process of Duplex 2205 capillary tubing in China, the characteristics of the material, applications, quality assurance, and the advantages of choosing a Duplex 2205 capillary tubing manufacturer in China.
Duplex 2205 stainless steel is a nitrogen-enhanced duplex stainless steel alloy known for its balanced microstructure of austenitic and ferritic phases. This unique composition results in superior strength, corrosion resistance, and durability compared to traditional austenitic stainless steels like 316L. Duplex 2205 capillary tubing is a small-diameter, thin-walled tube made from this alloy, designed to withstand harsh environments and high-pressure applications.
Key Chemical Composition of Duplex 2205:
| Element | Percentage Range |
|---|---|
| Chromium (Cr) | 21.0% - 23.0% |
| Molybdenum (Mo) | 3.0% - 3.5% |
| Nickel (Ni) | 4.5% - 6.5% |
| Nitrogen (N) | 0.10% - 0.22% |
| Carbon (C) | ≤ 0.030% |
| Manganese (Mn) | ≤ 2.00% |
| Phosphorus (P) | ≤ 0.030% |
| Sulfur (S) | ≤ 0.020% |
| Silicon (Si) | ≤ 1.00% |
This composition provides excellent resistance to pitting, crevice corrosion, chloride stress corrosion cracking, erosion, and corrosion fatigue[1][2][3][4].
The production begins with selecting high-quality raw materials that meet strict chemical composition standards for Duplex 2205. The raw materials, including iron, chromium, molybdenum, nickel, and nitrogen, are melted in an electric arc furnace (EAF) or vacuum induction furnace (VIM) to ensure purity and homogeneity.
After melting, the molten steel is cast into billets or slabs. These billets undergo hot rolling to form rough tubes or bars. Hot rolling refines the grain structure and helps achieve the desired mechanical properties.
The hot-rolled billets are then processed into tubes by forming the steel into a cylindrical shape. For welded tubes, the edges are joined using high-frequency welding (HFW) or electric resistance welding (ERW). Seamless tubes are produced by piercing and extrusion methods.
Cold drawing is a critical step for capillary tubing production. The tubes are drawn through a series of dies to reduce diameter and wall thickness to precise dimensions. This process enhances surface finish, dimensional accuracy, and mechanical strength.
After cold drawing, the tubes undergo annealing in a controlled atmosphere furnace to relieve internal stresses and restore ductility. The annealing process also stabilizes the duplex microstructure, optimizing corrosion resistance and mechanical properties.
The annealed tubes are straightened and cut to customer-specified lengths. Finishing processes include surface polishing, deburring, and end-forming such as flaring or coning, depending on application requirements.
Chinese manufacturers implement rigorous quality control measures throughout production. Typical tests include:
- Non-destructive testing (NDT) such as eddy current and ultrasonic inspections
- Hydrostatic pressure tests to verify tube integrity
- Dimensional accuracy and surface finish inspections
- Mechanical property testing (yield strength, tensile strength, hardness)
- Chemical composition verification through spectrometry
These steps ensure the Duplex 2205 capillary tubing meets international standards such as ASTM A789 and ASME SA789[2][3][7][10].
- Outer Diameter (OD): Typically ranges from 0.250 inches (6.35 mm) to 0.625 inches (15.88 mm), with smaller diameters also available down to 0.30 mm for precision applications.
- Wall Thickness: Usually between 0.032 inches (0.81 mm) and 0.065 inches (1.65 mm), customizable based on customer needs.
- Length: Coiled tubing can be supplied up to 15,000 meters per piece.
- Mechanical Properties: Yield strength ≥ 80,000 psi (550 MPa), tensile strength ≥ 95,000 psi (655 MPa), maximum hardness around 30C Rockwell.
- Corrosion Resistance: Excellent resistance to pitting, crevice corrosion, chloride stress corrosion cracking, and general corrosion in acidic environments.
- Weldability: Good weldability for fabrication and installation.
These specifications make Duplex 2205 capillary tubing ideal for demanding environments requiring durability and reliability[1][2][3][4].
Duplex 2205 capillary tubing produced in China serves a wide range of industries:
- Oil and Gas Industry: Used extensively for downhole chemical injection lines, hydraulic control lines, and pipeline instrumentation to prevent wax, scaling, and asphaltene deposits.
- Chemical and Petrochemical Plants: For liquid and gas transportation lines exposed to corrosive chemicals.
- Power Generation and Renewable Energy: Tubing for instrumentation and control lines in harsh environments.
- Medical Devices: Precision tubing for medical equipment requiring corrosion resistance and strength.
- Instrumentation and Measurement: Used in chromatography, remote thermometer systems, and other precision devices.
- Marine Industry: Resistant to seawater corrosion for shipbuilding and offshore applications.
- Food and Beverage Processing: Tubing for hygienic and corrosion-resistant applications.
The versatility of Duplex 2205 capillary tubing ensures it meets the needs of industries requiring high strength and corrosion resistance[2][5][7].
China's manufacturing capabilities allow for competitive pricing without compromising quality. The availability of raw materials, advanced production technology, and economies of scale reduce costs significantly.
Leading Chinese manufacturers follow strict quality control protocols, including ISO 9001 certification and multiple testing stages during production. Third-party inspections by SGS, BV, DNV, and others are common to ensure product reliability[10].
Chinese manufacturers offer customization in terms of diameter, wall thickness, length, surface finish, and packaging. This flexibility caters to diverse client requirements across global markets.
Manufacturers like EMHK and Wide Steel have over 20 years of experience in producing Duplex 2205 capillary tubing, supplying both welded and seamless tubes with large stock availability and quick delivery options[1][2][7][8].
Utilization of cold drawing, precise annealing, and modern testing equipment ensures the production of high-precision capillary tubes with excellent mechanical and corrosion properties[4][12].
Duplex 2205 capillary tubing manufactured in China combines advanced metallurgy, precise cold drawing techniques, and rigorous quality control to deliver a product that meets the stringent demands of various industries. Its superior corrosion resistance, high mechanical strength, and customization options make it a preferred choice for applications in oil and gas, chemical processing, medical devices, and more.
Choosing a reputable Duplex 2205 capillary tubing manufacturer in China offers significant advantages in cost, quality, and delivery. With over two decades of experience, Chinese manufacturers continue to innovate and supply reliable tubing solutions worldwide, supporting industries that require durable and high-performance stainless steel capillary tubes.
Duplex 2205 has a balanced microstructure of austenitic and ferritic phases with higher chromium, molybdenum, and nitrogen content, resulting in roughly double the yield strength and superior corrosion resistance compared to 316L stainless steel. This allows for thinner walls and longer service life in harsh environments[6].
Typical outer diameters range from 0.250 inches to 0.625 inches, with wall thicknesses between 0.032 inches and 0.065 inches. Custom sizes from 0.30 mm up to 31.75 mm OD and various wall thicknesses are also available. Lengths can reach up to 15,000 meters per coil[1][4].
Quality assurance includes multiple production stage tests such as non-destructive testing, hydrostatic pressure tests, surface finish inspections, dimensional accuracy measurements, and mechanical property verifications. Many manufacturers are ISO 9001 certified and accept third-party inspections[2][10].
Industries include oil and gas (chemical injection and control lines), chemical processing, power generation, medical equipment, instrumentation, marine, food and beverage, and renewable energy sectors due to the tubing's corrosion resistance and strength[2][5].
Yes, Chinese manufacturers offer extensive customization options to meet specific client requirements, including precise cut lengths, various diameters, wall thicknesses, surface finishes, and end-forming options like flaring or coning[1][4][7].
[1] https://widesteel.com/product/duplex-2205-capillary-tube-manufacture-in-china/
[2] https://widesteel.com/product/duplex-2205-capillary-tubing-distritutor-in-china/
[3] https://widesteel.com/product/duplex-2205-capillary-tubing/
[4] https://www.sscoiledtubing.com/products/ss_capillary_tubing/duplex_2205_capillary_tubing/duplex_2205_stainless_steel_seamless_coiled_tubings.html
[5] https://www.youtube.com/watch?v=9RpHsUT0Px0
[6] https://www.geopsi.com/blog/the-best-material-for-downhole-capillary-tube-duplex-2205-vs-stainless-steel-316l/
[7] https://widesteel.com/product/duplex-2205-capillary-tubing-distributor-in-china/
[8] https://www.linkedin.com/pulse/duplex-2205-capillary-tubing-update-price-list-china-cynthia-huang
[9] https://widesteel.com/product-category/ss-capillary-tube/duplex-2205-capillary-tube/
[10] https://tubingchina.com/faq-frequently-asked-questions.htm
[11] https://www.samaterials.com/ct5417-duplex-stainless-steel-2205-capillary-tube.html
[12] https://www.mtubing.com/1/316l-duplex-2205-alloy-625-alloy-825-capillary-coiled-tubing_product1411.html
[13] https://tubingchina.com/s32205-stainless-steel-tube-pipe-tubing.htm
[14] https://www.fushunsteeltube.com/product-item/stainless-steel-capillary-tube/
[15] https://mtubing.com/1/duplex-2205-coiled-capillary-tubing_product1064.html
[16] https://www.youtube.com/watch?v=Y7d-Mn1zeQU
[17] https://mtubing.com/asme-sa789-duplex-2205-coiled-tubing_product1063.html
[18] https://sscoilchina.en.made-in-china.com/product/BxHrOYnUCChw/China-ASME-14462-2205-Duplex-Stainless-Steel-Seamless-Pipe.html
[19] https://www.geopsi.com/products/capillary-tube/0-250-capillary-tube-duplex-2205-035/
[20] https://widesteel.com/product/duplex-2205-capillary-tube-supplier-in-china/
[21] https://www.mtubing.com/duplex-2205-stainless-steel-coiled-control-line-tubing_product1203.html
[22] https://seathertechnology.com/stainless-steel-capillary-tubes/
[23] https://www.geopsi.com/wp-content/uploads/2023/03/0.25-Capillary-Tube-Duplex-2205-0.035.pdf
[24] https://www.stainless-sheets.com/stainless-steel-pipe/alloy-duplex-pipe/duplex-2205-pipes-tubes.html
[25] https://www.fushunsteeltube.com/product-item/stainless-steel-capillary-tube/
[26] https://www.ronscopipe.com/stainless-steel-seamless-pipe/super-duplex-stainless-steel-2205-tube.html
[27] https://www.shcoiledtube.com/2205-stainless-steel-6-350-52mm-coiled-tubing-product/
[28] https://widesteel.com/product-category/capillary-tubing/duplex-2205-capillary-tubing/
[29] https://daxunsteel.en.made-in-china.com/product/XFBArmIOnHGe/China-Duplex-2205-Stainless-Steel-Pipe-ASME-SA789-High-Pressure-Resistance-Od-48-3mm-273mm-for-Building-Pipes-2205-Stainless-Steel-Tube.html
[30] https://www.geopsi.com/products/capillary-tube/
[31] https://www.sagarsteelcorporation.com/products/duplex-2205-pipe-tubes/46
[32] https://www.sciencedirect.com/topics/engineering/capillary-tubing
[33] https://www.youtube.com/watch?v=MQGBc6aWR38
[34] https://www.tjtgsteel.com/duplex-2205-coiled-tubing-supplier-in-china-6-35mm1-24mm.html
[35] https://jianglinsteel.com/stainless-steel-capillary-tube/
[36] https://www.tjtgsteel.com/2205-stainless-steel-coiled-tubing.html
[37] https://zjzdgt.en.made-in-china.com/product/TOWagNwMkbcD/China-Ss-2205-2507-Super-Duplex-Stainless-Steel-Pipe-and-Tube.html
[38] https://www.sscontrolline.com/is-china-a-good-source-for-2205-duplex-coil-tubing.html
[39] https://widesteel.com/product/duplex-2205-capillary-tubing-distributor-in-china/
[40] https://www.civmats.com/products/PRODUCTS-Stainless-Steel-Capillary.HTML
[41] http://www.metalspiping.com/duplex-2205.html
[42] https://www.multimetalsindia.com/uns-s31803-s32205-duplex-2205-tube.html
[43] https://d918c12edf8f4166.en.made-in-china.com/product/AEcphguXYLWC/China-Duplex-2205-Capillary-Tube-3mm-Diameter-Manufacture-in-China.html
[44] https://widesteel.com/product/duplex-2205-capillary-tubing/
[45] https://www.duplexpipes.com/duplex-2205-seamless-pipe-tube.html
[46] https://www.sekonicmetals.com/duplex-stainless-steel-2205-product/
[47] https://www.cps-stainlesssteel.com/tag/alloy-2205-coiled-tubing-pipeduplex-2205-alloy-capillary-tubing/
[48] https://www.sscontrolline.com/stainless-steel-capillary-tubing-manufacturer.html
[49] https://widesteel.com/product/duplex-2205-capillary-pipe-manufacture-in-china/
[50] https://www.samaterials.com/ct5417-duplex-stainless-steel-2205-capillary-tube.html
[51] https://widesteel.com/product/duplex-2205-control-line-3-8-inch0-049-inch/
