Views: 222 Author: Robert Publish Time: 2025-04-16 Origin: Site
Content Menu
● What Is 825 Seamless Coil Tubing Control Line?
● Chemical Composition and Corrosion Resistance of Alloy 825
● Manufacturing and Specifications of 825 Seamless Coil Tubing Control Line
● Corrosion Resistance in Harsh Environments
>> Resistance to Chloride Stress Corrosion Cracking
>> Resistance to Acidic Environments
>> Resistance to Pitting and Crevice Corrosion
● Mechanical Properties Supporting Corrosion Resistance
● Applications of 825 Seamless Coil Tubing Control Line
● Advantages of Using 825 Seamless Coil Tubing Control Line
● Installation and Handling Tips for Maximum Longevity
>> 1. What makes 825 seamless coil tubing control line corrosion resistant?
>> 2. Can 825 seamless coil tubing be used in subsea applications?
>> 3. What are the typical sizes available for 825 seamless coil tubing control lines?
>> 4. How does the seamless manufacturing process benefit the tubing?
>> 5. Is Alloy 825 weldable if repairs or modifications are needed?
When it comes to demanding industrial applications, especially in the oil and gas sector, corrosion resistance is paramount. The 825 seamless coil tubing control line is widely recognized for its excellent corrosion resistance, making it a favored choice for harsh environments. This article explores the corrosion resistance properties of 825 seamless coil tubing control lines, their chemical composition, mechanical properties, applications, and why they stand out in the industry.
The 825 seamless coil tubing control line refers to a type of tubing made from Alloy 825 (also known as Incoloy 825), manufactured in a seamless, coiled form. This tubing is used primarily for hydraulic control lines, chemical injection lines, and other control applications where durability and corrosion resistance are critical. The seamless manufacturing process enhances the tubing's strength and reliability by eliminating weld seams that could be weak points under pressure or corrosive attack.
Alloy 825 is a nickel-iron-chromium alloy with additions of molybdenum, copper, and titanium. These elements contribute to its outstanding corrosion resistance:
- Nickel (38-46%): Provides excellent resistance to chloride-ion stress corrosion cracking.
- Chromium (19.5-23.5%): Enhances oxidation resistance and protects against pitting and crevice corrosion.
- Molybdenum (2.5-3.5%): Improves resistance to localized corrosion such as pitting.
- Copper (1.5-3.0%): Boosts resistance to reducing agents such as sulfuric acid.
- Titanium (0.6-1.2%): Stabilizes the alloy against intergranular corrosion.
This unique combination allows Alloy 825 to resist both oxidizing and reducing environments, including sulfuric and phosphoric acids, seawater, and chloride-rich environments, which are common in oil and gas operations.
The tubing is produced by cold drawing and rolling processes to achieve a seamless, coiled form. It meets stringent ASTM standards such as ASTM B163, ASTM B423, and ASTM B704, ensuring high quality and performance.
| Specification Aspect | Details |
|---|---|
| Material Grade | Alloy 825 (UNS N08825) |
| Diameter Range | 3.18 mm to 25.4 mm (0.125" to 1") |
| Wall Thickness | 0.2 mm to 2 mm |
| Length | Up to 10,000 meters per coil |
| Condition | Annealed or cold-worked |
| Surface Finish | Bright annealed or polished |
One of the significant challenges in subsea and downhole environments is chloride-induced stress corrosion cracking (SCC). Alloy 825's high nickel content makes it highly resistant to SCC, ensuring long-term reliability in chloride-rich environments such as seawater.
Alloy 825 also excels in resisting corrosion from sulfuric and phosphoric acids, common in chemical injection lines and acidizing treatments in oil wells. Its molybdenum and copper content provide protection against aggressive reducing agents.
The chromium and molybdenum in Alloy 825 help prevent localized corrosion forms like pitting and crevice corrosion, which can cause premature tubing failure.
Besides chemical resistance, Alloy 825 seamless coil tubing control lines possess excellent mechanical properties that support their durability:
| Property | Value |
|---|---|
| Tensile Strength | ~550 MPa (80,000 psi) |
| Yield Strength (0.2% offset) | ~310 MPa (45,000 psi) |
| Elongation | ≥30% |
| Hardness | Max 90 HRB |
| Operating Temperature | Up to 550°C (1022°F) |
These properties ensure the tubing can withstand high pressure, mechanical stress, and temperature fluctuations without compromising corrosion resistance.
The corrosion-resistant nature and mechanical robustness of 825 seamless coil tubing control lines make them ideal for:
- Hydraulic Control Lines: Used in subsea and downhole environments to control valves and actuators.
- Chemical Injection Lines: Delivering corrosion inhibitors, scale inhibitors, and other chemicals in oil and gas wells.
- Subsea Umbilicals: Providing hydraulic power and chemical injection in subsea production systems.
- High-Pressure and High-Temperature Wells: Suitable for harsh environments with corrosive fluids.
- Other Industrial Uses: Including food processing, chemical plants, and pollution control equipment.
- Superior Corrosion Resistance: Against oxidizing and reducing agents.
- Seamless Construction: Eliminates weld-related weaknesses.
- Flexibility and Coiling: Easy to install in long continuous lengths.
- Compliance with Industry Standards: ASTM, ASME, and NACE certifications.
- Wide Range of Sizes and Lengths: Customizable to specific project needs.
- Avoid mechanical damage during handling to maintain surface integrity.
- Use proper cleaning to remove contaminants before installation.
- Consider protective coatings or encapsulation for extreme environments.
- Regular inspection and maintenance to detect early signs of corrosion.
The 825 seamless coil tubing control line is highly corrosion resistant, making it an excellent choice for demanding applications in oil and gas, chemical processing, and subsea environments. Its superior chemical composition, seamless manufacturing, and robust mechanical properties ensure reliable performance under harsh conditions. Whether used for hydraulic control, chemical injection, or subsea umbilicals, Alloy 825 tubing offers longevity and safety, reducing maintenance costs and downtime.
The unique chemical composition of Alloy 825, including high nickel, chromium, molybdenum, and copper content, provides excellent resistance to chloride stress corrosion cracking, pitting, crevice corrosion, and acid attack, making it highly corrosion resistant in harsh environments.
Yes, 825 seamless coil tubing is commonly used in subsea hydraulic control lines and chemical injection lines due to its ability to withstand seawater corrosion and high-pressure, high-temperature conditions.
The tubing is available in diameters ranging from 3.18 mm (0.125") to 25.4 mm (1") with wall thicknesses from 0.2 mm to 2 mm, and coil lengths up to 10,000 meters, customizable for various applications.
Seamless tubing eliminates weld seams, which are potential weak points for corrosion and mechanical failure, thereby enhancing the tubing's strength, reliability, and corrosion resistance.
Yes, Alloy 825 has good weldability using standard welding techniques, but proper pre-weld cleaning and post-weld heat treatment may be recommended to maintain corrosion resistance.
[1] https://www.dsstainlesssteel.com/chemical-injection-control-line/
[2] https://www.pacstainless.com/products/specialty-alloy-tubing/alloy-825-tubing/
[3] https://www.mtubing.com/1/alloy-825-downhole-seamless-hydraulic-control-line-tubing_product1542.html
[4] https://widesteel.com/product-category/hydraulic-control-line/inconel-825-control-line/
[5] https://www.allianzsteel.com/article/common-questions-about-incoloy-825-pipestubes.html
[6] https://www.mtstainlesssteel.com/alloy-825-unsn08825-24858_subpage169.html
[7] https://tubingchina.com/Material-Specification-of-Incoloy-825-UNS-N08825-Seamless-Control-Line-Tubes.htm
[8] https://www.sscontrolline.com/inconel-825-seamless-coil-tube.html
[9] https://www.sscontrolline.com/control-line-inconel-825-1-4in-od.html
[10] https://shop.machinemfg.com/comprehensive-guide-to-incoloy-825/
[11] https://www.roopamsteel.com/astm-b163-uns-n08825-incoloy-alloy-825-tube.html
[12] https://www.zheyisp.com/coiled-tubing-825-chemical-injection-linewelded-coiled-tubing-product/
[13] https://www.reliablepipestubes.com/inconel-incoloy/incoloy-825-tubing/
[14] https://www.controllinetubing.com/sale-13182681-corrosion-resistant-alloy-825-seamless-control-line-tubing.html
[15] https://www.mtubing.com/product_1124_Alloy825CoiledDownholeTubing.html
[16] https://www.mtstainlesssteel.com/316ls32205n08825-welded-downhole-coiled-tubing-for-chemical-injection-line_product565.html
[17] https://www.alleima.com/en/products/tube-pipe-fittings-and-flanges/tubular-products/control-lines/
[18] https://www.mtubing.com/chemical-injection-line-seamless-incoloy-825-coiled-tubing_product1934.html
[19] https://petrolcomuae.com/products/seamless-control-line-seamless-instrumentation-coil-tubes/
[20] https://widesteel.com/product/alloy-825-control-line-for-oil-and-gas/
[21] https://www.jigneshsteel.in/incoloy-825-tube.html
[22] https://widesteel.com/product/inconel-825-capillary-tube-control-line-for-oil-well/
[23] https://baoalloy.en.made-in-china.com/product/WwKaOXqgwZUP/China-Oil-Well-Control-Line-Tubing-Coiled-Tubing-in-Material-Stainless-Steel-and-Nickel-Alloy-Such-as-Inconel-625-825.html
[24] https://www.mtubing.com/product_1541_Incoloy825DownholeSeamlessHydraulicControlLineTubing.html
[25] https://www.finetubes.co.uk/-/media/ametekfinetubes/files/products/applications/e109_control_lines.pdf?la=en
[26] https://www.fushunsteeltube.com/product-item/incoloy-825-uns-n08825-2-4858-nicr21mo-nickel-based-alloy-pipe-tube/
[27] https://www.sscontrolline.com/stainless-steel-seamless-hydraulic-control-lines.html
[28] https://www.youtube.com/watch?v=lfLhMgoAKwM
[29] https://www.aeether.com/AEETHER/products/incoloy-825-nickel-alloy-coil.html
[30] https://shanghaibozhong.en.made-in-china.com/product/yXVQYKuPfZki/China-N08825-Incoloy-825-Seamless-Pipe.html
[31] https://www.youtube.com/watch?v=wXhSyx9eoP4
[32] https://www.steeltubesindia.net/incoloy-825-tube.html
[33] https://www.tjtgsteel.com/alloy-825-stainless-steel-coiled-tubing-coil-tubes-china-suppliers.html
[34] https://www.youtube.com/@cynthiahuang4640
[35] https://widesteel.com/product-category/capillary-tubing/incoloy-825-capillary-tubing/
[36] https://globy.com/b2bmarket/listing/products/capillary-tubing-control-line-coil-tubing-hydraulic-control-line-tubing-e6d7cf?q=air+filter&country%5B%5D=lk&page=1
[37] https://www.finetubes.co.uk/aboutus/faq
[38] https://www.unifiedalloys.com/blog/seamless-vs-welded-pipe
[39] https://widesteel.com/product-category/hydraulic-control-line/inconel-825-control-line/
[40] https://www.superiortube.com/products/materials/nickel-alloys/alloy-825-uns-n08825wnr-2-4858
[41] https://shop.machinemfg.com/understanding-incoloy-825-properties-market-and-applications/
[42] https://widesteel.com/product/alloy-625-control-line-1-4inch-od-0-049inch-thickness/
[43] https://www.sscontrolline.com/what-are-the-applications-of-inconel-825-control-line-in-oil-gas.html
[44] https://www.samaterials.com/incoloy-825-(uns-n08825)/1242-incoloy-825-alloy-825-uns-n08825-tube-pipe.html
[45] https://www.octalsteel.com/resources/incoloy-825-nickel-alloy-825-uns-n08825-pipe/
[46] https://www.finetubes.co.uk/applications/control-lines
[47] https://www.aeether.com/AEETHER/media/media-28/media.html
[48] https://www.tjtgsteel.com/astm-825-stainless-steel-coiled-tubing-suppliers.html
[49] https://www.reliant.in/incoloy-825-seamless-pipe.html
[50] https://www.zheyisp.com/coiled-tubing-825-chemical-injection-linewelded-coiled-tubing-product/
[51] https://www.mtstainlesssteel.com/ddv-control-line-alloy-825-stainless-steel-welded-coiled-tubing-for-chemical-injection-line_product132.html
[52] https://www.aeether.com/AEETHER/products/incoloy-825-nickel-alloy-capillary-tube.html
[53] https://www.mtubing.com/1/alloy-825-downhole-seamless-hydraulic-control-line-tubing_product1542.html
[54] http://www.sincopipeline.com/ProDetail.aspx?ProId=159
