Monel pipes are a superalloy composed of nickel and copper and are a popular choice for chemical plants, oil refineries, petrochemical facilities and wastewater treatment plants because of their durability.
Table of Contents
They are also used in aircraft construction and rocket frames, as they retain strength at high temperatures. In small amounts, Monel also consists of manganese, carbon, iron, and silicon. These pipes were invented by the American engineer Robert Crooks Stanley in 1901, who patented it and named it after their company president, Ambrose Monel. Its corrosion resistance properties make monel ideal for chemical installations that withstand hostile humidity, temperature and abrasive conditions and resist corrosion from rapidly running seawater. Monel pipes are also affordable compared to stainless steel pipes – monel pipe price is relatively economical for its abilities, but compared to copper and nickel, it is expensive.
Monel pipes also offer good resistance against hydrofluoric acid up to the boiling point in all concentrations. These pipes also resist sulphuric and hydrochloric acids in reducing conditions. Pipes made using Monel find applications in other applications such as pump shafts, piping systems, seawater valves, trolling wires and strainer baskets. Monel also serves applications in many chemical industries as it offers resistance to corrosion from acids and oxygen. Types of Monel include Monel 400, Monel 401, Monel 404, Monel 405, Monel K-500 and Monel R-500.
Monel pipes offer many advantages in terms of properties and applications compared to traditional piping materials. In addition to these uses, monel pipes also have excellent mechanical fatigue strength and electrical conductivity. This allows monel to be used as an alternative material choice in multiple cracking loads components like bolts, tools, springs, and fasteners.
400 Monel Pipes
Monel 400 Pipe is made up of a nickel alloy that has roughly 67% nickel in the composition.
400 Monel Pipes are alloys of copper, iron, and nickel. Despite their relatively simple chemical formula, these pipes offer unparalleled strength thanks to a combination of nickel-copper and copper-nickel alloys. The result is a heat-resistive alloy that also works well against corrosion in seawater, acids, and bases – you name it! Monel Pipe has the bonus of being machinable and weldable.
Monel 400 pipes are commonly used in various industries due to their highly durable properties. Their remarkable resistance to pressure and temperature gradients make them especially suitable for use as heat exchangers, pumps, and manifolds, as well as other components that are vulnerable to corrosion. Further, 400 Monel pipes are ideal for carrying both hot and cold fluids due to their excellent mechanical strength, which can prevent thermal expansion or contraction from occurring, and also contains a range of other beneficial properties such as exceptional electrical conductivity, practicality with welding and soldering applications as well as being non-magnetic. Consequently, this ensures its suitability in many environments, including marine conditions.
Standard
- ASTM B163 seamless tube standard: Monel 400 seamless tube
- ASTM B165 standard: Monel 400 seamless pipe, Monel 400 seamless tube
- ASTM B474 welded pipe standard: Monel 400 EFW pipe
Monel 400, Monel K500 Pipe tube size
- Seamless Pipe size: 4 to 219mm; W. T.: 0.5 to 20mm
- Seamless Tube Size: 3.35 mm To 101.6 mm (OD)
- Welded Pipe size: 5.0 mm – 1219.2 mm
Chemical Analysis (%)
| Ni (plus Co) | 63.0 min.-70.0 max. |
| Cu | 28.0 min.-34.0 max. |
| C | 0.3 |
| Mn | 2 |
| Fe | 2.5 |
| S | 0.024 |
| Si | 0.5 |
Standards of Monel 400 Tube/Pipe
| Plate, Sheet, and Strip | Bar, Rod, Wire, and Forgings | Pipe & Tube |
| BS3072NA13 BS3073NA13 ASTM B 127 ASME SB 127 SAE AMS 4544 DIN 17750 QQ-N-28 | BS3075NA13 BS3076NA13 ASTM B 164 ASTM B 564 ASME SB 164 ASME SB 564 AECMA PrEN 2305 SAE AMS 4675 SAE AMS 4730 SAE AMS 4731 DIN 17752 DIN 17753 DIN 17754 VdTÜV 263 QQ-N-28 | BS3074NA13 ASTM B 163 ASTM B 165 ASTM B 725 ASTM B 730 ASTM B 751 ASTM B 775 ASTM B 829 ASME SB 163 ASME SB 165 ASME SB 725 ASME SB 730 ASME SB 751 ASME SB 775 ASME SB 829 SAE AMS 4574 DIN 1775 VdTÜV 263 |
Applications of Monel 400 Tube/Pipe
– Industrial heat exchangers
– Marine engineering
– Boiler food water heater
– Chlorinated solvents
– Chemical and hydrocarbon processing equipment
– Marine engineering
– Crude petroleum stills
– De-aerating heaters
– Gasoline & freshwater tanks
– Chemical & hydrocarbon processing equipment