The difference between Monel 400 and Monel K500 tubes is that Monel 400 tubes offer good strength and ductility for general corrosion-resistant uses. Monel K500 tubes provide higher strength and hardness due to added aluminium and titanium. This suits high-stress applications.
ASTM B165 Monel 400 Seamless Tube Manufacturer
We are Zhejiang Xintongda Special Steel (XTD), a leading Monel 400 seamless tube manufacturer in China. Monel 400 tube, also called Nickel alloy 400 tube, is a nickel-copper alloy that typically contains at least 63% nickel and 28–34% copper. One of the primary reasons Monel 400 tubing is widely preferred is its exceptional corrosion resistance, especially in marine environments and to a wide range of acids and alkalis. We manufacture Monel 400 tubes in compliance with the ASTM B165 standard. It has good mechanical strength under pressure, good ductility, and higher thermal conductivity than many austenitic stainless steels (e.g., 304/316). Our tube is used in critical industries like marine engineering, chemical processing, and oil refining industries. We are a multiple international certified supplier and have an annual supply capacity of 25,000 tons. We can supply stock orders in about a week.
Our ASTM B165 UNS N04400 tubes follow these specifications:
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Standard
ASTM B165
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OD Range
6–457 mm
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Thickness
1-65 mm
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Length
≤ 22 m
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Technical Data
Technical Data
Manufacturing Process of Alloy 400 Seamless Tube
The manufacturing process of Monel 400 alloy tubes begins with heating the solid alloy billet to a high temperature. After heating, this material is hot extruded to create a hollow shell. The tube is then cold-drawn/rolled depending on size and tolerance requirements. To learn about the precise manufacturing of Alloy 400 tubes visit this page.
Characteristics & Advantages of Monel 400 Tubing
Monel 400 seamless nickel alloy has many features and advantages. These are corrosion resistance, oxidation resistance, long service life in harsh operating conditions, creep and fatigue resistance and resistance to stress corrosion cracking in freshwaters.
- Outstanding Corrosion Resistance: This tube shows remarkable resistance to corrosive agents, including many non-oxidising acids and selected alkalis. This chemical stability in corrosive media is due to the presence of high nickel and copper.
- Good Oxidation Resistance: Monel 400 exhibits good resistance to oxidation under moderate temperature conditions. This reduces surface scaling when exposed to air. Its high nickel content forms a protective oxide film that slows oxygen diffusion and helps maintain material integrity during service.
- Long Service Life in Harsh Operating Conditions: This tube is made to last in very harsh conditions, like high temperatures, pressures and corrosive media. The unique chemical composition of Monel 400 gives it the strength and stability it needs to last longer.
- Moderate Creep and Fatigue Resistance: Even when subjected to prolonged stress or cyclical loading, Alloy 400 tube maintains its structure and mechanical properties. The alloy's strong, stable crystalline structure at working temperatures makes it resistant to creep and fatigue.
- Excellent Resistance to Stress Corrosion Cracking in Freshwaters: The tube resists cracking when simultaneously exposed to tensile stress and a corrosive environment, particularly fresh water. This is due to the balanced nickel-copper composition, which is less susceptible to this specific failure.
ASTM B165 Nickel Alloy 400 Seamless Tube Tolerance
When making high-performance tubes like the ASTM B165 UNS N04400 seamless tubes, it is very important to follow strict dimensional tolerances. Exact tolerances make sure that the tubes fit and work properly in high-end equipment.
| Nominal Outside Diameter, in. (mm) |
Permissible Variations | |||||
| Outside Diameter, in. (mm) |
% of Thickness of Specified Nominal Wall |
% of Thickness of Specified Minimum Wall |
||||
| + | − | + | − | + | − | |
| Over 0.400 (10) to ⅝ (16), excl | 0.005 (0.13) | 0.005 (0.13) | 15.0 | 15.0 | 30 | 0 |
| ⅝ (16) to 1½ (38), incl | 0.0075 (0.19) | 0.0075 (0.19) | 10.0 | 10.0 | 22 | 0 |
| Over 1½ (38) to 3 (76), incl | 0.010 (0.25) | 0.010 (0.25) | 10.0 | 10.0 | 22 | 0 |
| Over 3 (76) to 4½ (114), incl | 0.015 (0.38) | 0.015 (0.38) | 10.0 | 10.0 | 22 | 0 |
| Over 4½ (114) to 6 (152), incl | 0.020 (0.51) | 0.020 (0.51) | 12.5 | 12.5 | 28 | 0 |
| Over 6 (152) to 6⅝ (168), incl | 0.025 (0.64) | 0.025 (0.64) | 12.5 | 12.5 | 28 | 0 |
| Over 6⅝ (168) to 8⅝ (219), incl | 0.031 (0.79) | 0.031 (0.79) | 12.5 | 12.5 | 28 | 0 |
Monel UNS N04400 Equivalent Material
This tube is commonly known as UNS N04400. Some of the global equivalents include Werkstoff 2.4360, BS NA13 and JIS NW4400.
| GRADE | UNS | GB | JIS | ISO | DIN/EN | GOST | |
| ISC | NEW | ||||||
| Monel 400 | N04400 | H04400 | NS3400 | - | - | 2.4360 | - |
100% Certified Testing & Documentation
- EN 10204 3.1 and EN 10204 3.2 Material Test Certificates (MTC)
- Raw Materials Certificate
- 100% PMI
- Heat Treatment Charts
- Third-Party Inspection Report
- Surface roughness and size measurement
- Manufacturer Test Certificate (Impact Testing, Flattening, Flare, Bend, Hardness, Intergranular, Pitting Corrosion, Grain size, ET, UT, HT)
- Laboratory Test Certificate from the Government-Approved Lab
ASTM B165 UNS N04400 Seamless Tube Applications and Industries
Nickel alloy 400 tube has 8 primary applications. These include:
Alkylation Plants (Sulfuric/Hydrofluoric Acid)
The tube is used for handling and transferring highly corrosive sulfuric and hydrofluoric acids in the production of high-octane gasoline. Its high corrosion resistance is vital to prevent rapid material degradation from these strong chemicals.
Transfer Piping from Oil Refinery Crude Columns
Monel 400 tube is used to move hot and corrosive vapours and crude oil fractions from distillation columns. It can safely deal with the high temperatures and sulfur compounds that are in these streams.
Monoethanolamine (MEA) Reboiling Tubes
Alloy 400 tube is used as heat exchanger tubing inside reboilers to concentrate the MEA solution used for gas sweetening. It resists the corrosion from the hot, concentrated amine solution.
Pickling Bath Heating Coils
The tube forms coils submerged in heated acid baths, typically for cleaning scales from steel surfaces. Its resistance to various hot acids prevents premature failure of the heating element.
Brine Heaters and Seawater Scrubbers
This tube is crucial in heating saline water and in systems that clean flue gases using seawater. This application is enabled by its specific and excellent seawater resistance.
Feed-Water and Steam-Generator Tubing
ASTM B165 tube is employed in power plants for carrying hot feedwater or generating steam. It handles the combination of high pressure, high temperature, and potential for erosion-corrosion.
Manufacturing of Perchloroethylene and Chlorinated Plastics
The tubing is used in chemical processing equipment that handles corrosive chlorine and chloride compounds. It prevents degradation from these halogens during synthesis.
Uranium Refining and Nuclear Fuel Production
The tube is used in many processes where it is important that it can resist certain corrosive substances that are used in refining and handling nuclear materials. These delicate operations need it to be stable and have controlled chemistry.
Frequently Asked Questions
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Difference between Monel 400 and Monel K500 tubes?
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What material is Monel 400 Tube compatible with?Monel 400 tube is compatible with harsh corrosive media like seawater, acids like hydrofluoric and sulfuric, and alkalis in chemical processing.
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Is Monel 400 tube more corrosion-resistant than SS 316L?Yes, Monel 400 tube has better corrosion resistance than SS 316L in seawater, marine environments, and reducing acids.
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Can I get Monel 400 tubes in customised sizes?Yes, we at XTD provide Monel 400 tubes in custom sizes. We offer outer diameters ranging from 6–457 mm, thicknesses from 1–65 mm, and lengths up to 22 m.
- Manufacturing Process of Alloy 400 Seamless Tube
- Characteristics & Advantages of Monel 400 Tubing
- ASTM B165 Nickel Alloy 400 Seamless Tube Tolerance
- Monel UNS N04400 Equivalent Material
- 100% Certified Testing & Documentation
- ASTM B165 UNS N04400 Seamless Tube Applications and Industries
- Frequently Asked Questions