When you buy directly from a manufacturer like XTD, you get the best prices as there are no extra costs or commissions from middlemen. We offer direct quality, which means we can make things to your exact specifications and do specialized testing that other suppliers can't.
Monel Pipe Manufacturer
We are Zhejiang Xintongda Special Steel (XTD), a leading China-based manufacturer and global supplier of Monel pipe. Monel is a nickel-copper alloy with approximately 63 to 70% nickel and 28 to 34% copper, engineered for service that would attack ordinary stainless. Its defining strengths are resistance to de-aerated hydrofluoric acid, high-velocity seawater, and reducing acids, plus stable strength from cryogenic temperatures to about 538 °C (1000 °F). We manufacture seamless Monel pipe to ASTM B165 (equivalent ASME SB-165) for Monel 400. Age-hardened Monel K-500 in seamless pipe form is supplied to a company specification that references ASTM B865 for chemistry and heat-treat condition, since there is no dedicated ASTM standard for K-500 in pipe or tube form. Typical applications include marine and offshore environments, hydrofluoric acid alkylation units, chemical processing plants, and salt production facilities. We hold multiple international certifications, listed on our Certificate page, and operate with an annual production capacity of 25,000 tons, with a 200 kg minimum order for custom runs and no minimum for stock items. Stock products typically ship within one week, while custom production orders are usually completed within 15 to 60 days.
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OD Range
6 - 457 mm
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Thickness
1 - 65 mm
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Length
≤ 18 m
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What is a Monel Pipe?
A Monel pipe is a high-performance piping product made from a nickel-copper alloy that we specifically design for highly corrosive environments where carbon steel or regular stainless steel would quickly break down. Monel metal is an alloy of predominantly nickel (ranging from 63% to 70%) and copper (approximately 28%-34% copper), with small but critical additions of iron, manganese, carbon, and silicon to enhance its mechanical profile. The chemical stability of Monel allows it to withstand high-velocity flowing seawater with minimal erosion. It also provides reliable performance in high-temperature steam environments. Being a non-ferrous alloy, Monel forms a stable protective surface layer rather than rusting like iron-based metals, providing long-term corrosion resistance. This makes it a strong choice for offshore and chemical industrial infrastructure.
What are the Key Features and Benefits of Monel Alloy Pipe?
The 5 main features and benefits of monel pipe material are given below:
- High mechanical strength: These pipes provide substantially higher yield and tensile strength than standard carbon steel and 300-series stainless steel pipes. This strength is necessary because it prevents the pipe from deforming under heavy pressure.
- Extreme corrosion resistance from acids and alkalis: The material naturally resists aggressive chemicals like de-aerated hydrofluoric acid, non-oxidizing salts, and alkalis without pitting or thinning. It also offers moderate resistance to sulfuric acid at low concentrations. This ensures the piping system maintains integrity over years of chemical exposure, making it valuable for clients in salt processing and chemical industries.
- Cost-Effective for Harsh Environments: Monel costs more at first, but it lasts a lot longer than steel. As you don't have to replace the pipes often, it lowers the total cost of ownership.
- Formability: The material is easy to bend and shape during the installation process. This allows engineers to create complex piping layouts without damaging the metal's internal structure.
- Weldability: We ensure our pipes can be welded using standard gas tungsten or metal-arc techniques. Good weldability ensures that joints remain as strong as the pipe itself, preventing leaks at the seams.
Monel Pipe Specification
We provide a wide range of dimensional specifications to meet global engineering requirements for high-pressure service.
Standard
ASTM B165 / ASME SB165
Outside Diameters
6 - 457 mm
Length
≤ 18 m
Thickness Range
1 - 65 mm
Grades
Monel 400 / K-500
Form
Round (per ASTM B165 for Monel 400; K-500 supplied to company spec)
End
Plain End, Beveled End, Threaded
Testing
PMI, Radiography, Mechanical, Chemical
What are the Types and Shapes of Monel Pipe?
We are specialists in manufacturing seamless Monel pipes, produced in various shapes, that can withstand extreme internal pressures without the risk of seam failure. We use advanced extrusion and drawing methods in our factory to ensure every Monel piping product has the right wall thickness and surface finish. We manufacture Monel pipe as a seamless round product only. The two forms below cover XTD's supply.
Monel Seamless Pipe
Monel Round Pipe
What are the Common Grades of Monel Pipes?
We mostly work with two specific grades Monel 400 and Monel K500. They meet most of the needs of industrial piping systems. Each grade is engineered to deliver an optimised balance of strength, hardness, and corrosion resistance for demanding service conditions.
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Monel 400
This grade pipe (UNS N04400 / 2.4360) is known for its excellent resistance to seawater and steam at high temperatures. It is the go-to material for general corrosion resistance in chemical plants and marine hardware due to its high ductility.
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Monel K-500
Monel K-500 pipe (UNS N05500 / 2.4375) has the same corrosion resistance as Monel 400 but adds aluminium and titanium. This makes the pipe much harder and stronger through age hardening, allowing it to serve in more demanding mechanical environments. Unlike Monel 400, K-500 is virtually non-magnetic even at cryogenic temperatures, making it suitable for magnetic-field-sensitive equipment.
Monel Pipe Comparison of Corrosion Resistance
The following table summarises the corrosion resistance behaviour of Monel 400 and K500 alloy in different acidic environments to help you choose the right material.
| Acidic Environment | Monel 400, K-500 |
| Sulfuric acid | Good to excellent |
| Hydrochloric acid | Acceptable |
| Hydrofluoric acid | Good to excellent |
| Phosphoric acid | Good to excellent |
| Nitric acid | Not suitable |
| Organic acids | Good to excellent |
| Alkalines & salts | Good to excellent |
| Seawater | Good to excellent |
Which Industries Use Monel Pipes?
Monel pipes are used across industries where other materials fail under extreme chemical exposure, high temperatures or corrosive environments. Below are the 6 primary applications:
Marine applications
These pipes are used in seawater intake systems and propeller shafts for marine vessels. They are chosen because they do not corrode in salt water, even at high flow speeds where other metals erode.
Oil and Gas
We supply these for downhole drill tools and sour gas piping in offshore rigs. They are used here because they resist hydrogen-induced cracking and sulfide stress corrosion in "sour" environments.
Chemical Processing
Our pipes are installed in plants that handle fluorination and chlorinated hydrocarbons. They provide safety because they do not react with these highly volatile and acidic chemicals during processing.
Aerospace
Monel is used in aerospace for valve components, springs, exhaust system elements, and fasteners. Its ability to maintain strength at elevated temperatures makes it suitable for engine-adjacent components.
Power Generation
We provide piping for boiler feedwater heaters and high-efficiency heat exchangers. It is used in power plants because it facilitates efficient heat transfer while resisting steam erosion over long duty cycles.
Salt Production
Our Monel piping is used in evaporation equipment for salt refineries. It is applied here because the high chloride concentration would cause standard stainless steel to fail via pitting or stress corrosion.
100% Certified Testing & Documentation
- EN 10204 3.1 and EN 10204 3.2 Material Test Certificates (MTC)
- Raw Materials Certificate
- 100% Positive Material Identification (PMI)
- Heat Treatment Charts
- Third-Party Inspection Report
- Surface roughness and size measurement
- Manufacturer Test Certificate (Impact Testing, Flattening, Flare, Bend, Hardness, Intergranular Corrosion, Pitting Corrosion, Grain size, Eddy Current (ET), Ultrasonic Testing (UT), Hydrostatic Testing (HT), etc.)
- Laboratory Test Certificate from Government-Approved Lab
If you want to know more product details, please contact us!
Frequently Asked Questions
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Why should you buy Monel pipes directly from a manufacturer instead of a supplier?
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Why choose Monel pipes over stainless steel?Monel pipes are chosen over stainless steel when the application involves high concentrations of de-aerated hydrofluoric acid or high-velocity seawater, where stainless steel would suffer from pitting or stress corrosion cracking. Monel also maintains superior mechanical strength and toughness at both cryogenic and elevated temperatures, making it more reliable in volatile industrial settings.
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Are Monel pipes suitable for high temperatures?Yes. Monel 400 maintains good strength up to about 538 °C (1000 °F). Monel K-500 can be used up to about 649 °C (1200 °F), though its properties start to decline above 593 °C (1100 °F). For higher temperatures, use Inconel 625 or 718.
- What is a monel pipe?
- What are the key features and benefits of monel alloy pipe?
- Monel pipe specification
- What are the Types and Shapes of Monel Pipe?
- What are the common grades of monel pipes?
- Monel pipe comparison of corrosion resistance
- Which Industries Use Monel Pipes?
- 100% Certified Testing & Documentation
- Frequently Asked Questions