A Ni-Cu alloy with high strength and good corrosion resistance
- Excellent resistance to hydrofluoric acid
- Excellent resistance to sea water for marine applications
- High strength metal with good toughness at high temperatures
- Monel Grades: Alloy 400 and K500
- Threaded flange features and benefits
Monel® threaded flanges, like Monel 400 and K500, are made from a nickel-copper alloy and exhibit high strength, toughness and good corrosion resistance over a wide temperature range. An outstanding characteristic of Monel threaded flanges is that they offer exceptional resistance to hydrofluoric acid, a particularly tough acid to deal with, in all concentrations up to the boiling point. For hydrofluoric acid applications Monel threaded flanges are perhaps the most resistant of all commonly used specialty alloys.
Monel alloy 400 & K500 threaded flanges also exhibit excellent corrosion resistance in marine applications and have reasonable corrosion resistance to sulfuric and hydrochloric acids under reducing conditions. Monel K500 threaded flanges are over 2x as strong as Monel 400 threaded flanges.
Because of these characteristics, Monel threaded flanges are often found in marine and chemical processing applications.
The most common grades of Monel nickel alloy flanges are Monel 400 and Monel K500 . Gain more insight on these two grades by accessing our Monel 400 and K500 overviews or by contacting our engineering experts.
Monel 400, UNS N04400 (QQ-N-281), is a nickel-copper alloy with high strength and excellent corrosion resistance in a range of media including sea water, hydrofluoric acid, sulfuric acid, and alkalies. Monel 400 is commonly in marine engineering, chemical and hydrocarbon processing applications.
Monel 400 Specifications: BS3075NA13 (Wire), BS3076NA13 (Bar), ASTM B 164 (Rod, Bar, and Wire), ASTM B 564 (Forgings), ASME SB 164 (Rod, Bar, and Wire), ASME SB 564 (Forgings), AECMA PrEN 2305 (Wire for Rivets), SAE AMS 4675 (Bars and Forgings), SAE AMS 4730 (Wire), SAE AMS 4731 (Wire and Ribbon), DIN 17752 (Rod and Bar), DIN 17753 (Wire), DIN 17754 (Forgings), VdTÜV 263 (Sheet, Plate, Bar, and Tubing), QQ-N-281 (Plate, Sheet, Strip, Bar, Rod, Wire, and Forgings), Werkstoff 2.4360
Monel K500, UNS N05500 (QQ-N-286), is a precipitation-hardenable nickel-copper alloy that combines the corrosion resistance of Monel alloy 400 with greater strength (over 2x as strong) and hardness. It also has low permeability and is nonmagnetic to temperatures as low as -150°F (-101°C).
Monel K500 Specifications: BS3075NA18 (Wire), BS3076NA18 (Rod and Bar), ASTM B 865 (Rod and Bar), DIN 17752 (Rod and Bar), DIN 17753 (Wire), DIN 17754 (Forgings), QQ-N-286 (Rod, Bar, Wire, and Forgings), SAE AMS 4676 (Rod and Bar), ASME Code Case 1192 (Rod and Bar), ISO 9723 (Bar), ISO 9724 (Wire), ISO 9725 (Forgings), Werkstoff 2.4375
Monel threaded flanges have a tapered female thread to join the male threads of a pipe in order to create a tight seal. This type of flange is most ideal when post weld heat treatment is not possible in hazardous, flammable or explosive applications where welding is too dangerous. Monel threaded flanges are also convenient in pilot processes whose configuration is often changed.
Threaded Flange Advangtages
- The main benefit is that that threaded seal eliminates the need for welding.
- As they do not require welding they save time and money to install.
- Allow for connections to be made in dangerous, explosive applications where welding is not possible.
- Useful connection in materials that are difficult to create a successful and strong weld.
- Ideal for connecting small diameter pipes.
- Systems could be easily reconfigured.
Threaded Flange Disadvantages
- They are not suitable where high temperatures, frequent cyclic conditions or bending stresses are likely in applications.