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Monel 400 (K400) pipe and Fittings is a premium nickel-copper alloy known for its exceptional corrosion resistance and high strength. It is widely used in chemical, marine, and industrial applications where durability and reliability are critical. Monel 400 pipes and Fittingss can withstand harsh environments, including seawater, acidic solutions, and alkaline conditions.
Manufactured in both seamless and welded forms, Monel 400 (K400) pipes and Fittingss offer superior mechanical properties. They maintain excellent structural integrity under high temperature and pressure, making them ideal for heat exchangers, condensers, and other demanding equipment in chemical processing plants.
Monel 400 (also known as K400) pipe fittings are high-performance nickel-copper alloys designed for corrosion resistance in aggressive environments. Known for their strength, durability, and resistance to a wide range of chemical and marine conditions, these fittings are widely used in chemical processing, marine engineering, desalination plants, and offshore oil and gas applications.
Monel 400 contains approximately 63% nickel and 28–34% copper, along with small amounts of iron, manganese, and trace elements. This combination of nickel and copper provides excellent resistance to both reducing and oxidizing environments, including seawater, acids, and alkalis, making it suitable for harsh industrial applications.
The alloy's high resistance to stress corrosion cracking, pitting, and crevice corrosion ensures long service life even in aggressive environments. Monel 400 pipes and Fittingss are particularly favored in marine engineering, offshore applications, and desalination plants, where exposure to saltwater is constant.
Monel 400 (K400) pipe and Fittings is available in a wide range of sizes and dimensions to meet diverse industrial requirements. Its versatility and ease of fabrication make it suitable for welding, bending, and machining, enabling engineers to design customized piping systems efficiently.
Monel 400 pipe fittings offer high tensile strength ranging from 550–650 MPa and yield strength around 240–300 MPa. Elongation typically ranges from 30–40%, providing flexibility and durability under mechanical stress. These properties make Monel 400 fittings suitable for high-pressure and demanding piping systems.
The standout feature of Monel 400 fittings is their exceptional corrosion resistance. They resist pitting, crevice corrosion, and stress corrosion cracking in chloride-rich environments, seawater, and chemical media. This makes them ideal for marine applications, chemical pipelines, and process equipment exposed to aggressive fluids.
Specification Table
| Property | Description |
|---|---|
| Material | Monel 400 (K400) |
| Alloy Type | Nickel-Copper Alloy |
| Standards | ASTM B366, ASTM B164, ASME SB366 |
| Forms Available | Elbows, Tees, Reducers, Flanges, Caps |
| Temperature Range | -200°C to 982°C (-328°F to 1800°F) |
| Corrosion Resistance | Excellent resistance to seawater, hydrofluoric acid, and alkalis |
| Applications | Chemical, Marine, Offshore, Heat Exchangers, Desalination Plants |
Chemical Composition (Typical ranges for SSS32760)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | Composition (%) |
|---|---|
| Nickel (Ni) | 63 min |
| Copper (Cu) | 28 - 34 |
| Iron (Fe) | 2.5 max |
| Manganese (Mn) | 1.0 max |
| Carbon (C) | 0.30 max |
| Silicon (Si) | 0.50 max |
| Sulfur (S) | 0.024 max |
| Cobalt (Co) | 1.0 max |
Mechanical Properties (Typical)
| Property | Value |
|---|---|
| Tensile Strength (MPa) | 550 - 750 |
| Yield Strength (MPa) | 200 min |
| Elongation (%) | 30 min |
| Hardness (HRB) | 70 - 100 |
| Ductility | Excellent |
| Impact Resistance | Good at low temperatures |
| Temperature Range | -200°C to 982°C (-328°F to 1800°F) |
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| ASTM / ASME | Monel 400 / K400 |
| UNS | N04400 |
| EN / DIN | 2.4360 |
| JIS | NCF400 |
| BS | NA |
| ISO | NiCu 30-70 |
Dimension & Weight Chart (Selected common sizes)
Below is a representative chart showing outside diameter, wall thickness, inside diameter, cross-sectional area of metal and calculated weight per metre (kg/m). Values are calculated using density = 7.93 g/cm³ and are for guidance — use actual MTC values for procurement & engineering.
| Size (inch) | Outside Diameter (mm) | Schedule | Wall Thickness (mm) | Weight per Meter (kg) |
|---|---|---|---|---|
| 1/2" | 21.3 | 40 | 2.77 | 0.52 |
| 3/4" | 26.7 | 40 | 2.87 | 0.78 |
| 1" | 33.4 | 40 | 3.38 | 1.12 |
| 1 1/2" | 48.3 | 40 | 4.55 | 2.05 |
| 2" | 60.3 | 40 | 5.54 | 3.05 |
| 3" | 88.9 | 40 | 7.11 | 5.75 |
| 4" | 114.3 | 40 | 7.62 | 8.64 |
| 6" | 168.3 | 40 | 9.27 | 16.12 |
| 8" | 219.1 | 40 | 9.53 | 23.76 |
Types Of Pipe Fittingss and Tubes
Tube Unions
Bite Type Tube Fittings
Stainless Steel Pipe Fittings
Forged Fsitting
Fitting
Carbon Steel Butt Weld Pipe Fittings
Frequently Asked Questions (FAQ)
1. What is Monel 400 (K400)?
Monel 400, also known as K400, is a Nickel-Copper alloy known for its excellent corrosion resistance in seawater and chemical environments. It is widely used in pipe fittings, flanges, elbows, and tees.
2. What are the typical applications of Monel 400 pipe fittings?
Monel 400 pipe fittings are commonly used in chemical processing, marine, offshore, desalination plants, and heat exchangers due to their high corrosion resistance and durability.
3. What standards do Monel 400 / K400 pipe fittings comply with?
They generally comply with ASTM B366, ASTM B164, ASME SB366, and international equivalents such as UNS N04400 and EN 2.4360.
4. What is the temperature range of Monel 400 pipe fittings?
Monel 400 fittings can operate in a temperature range of approximately -200°C to 982°C (-328°F to 1800°F).
5. Are Monel 400 pipe fittings resistant to corrosion?
Yes, they offer excellent resistance to corrosion in seawater, hydrofluoric acid, alkalis, and other harsh chemical environments.
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