Monel 400® - K400

The following data is provided for informational purposes only. It was provided with permission by Special Metals at www.specialmetals.com 

Monel 400®, or K400 ( also known as UNS 04400), is used known for having high strength and resistance to most corrosive elements, especially saltwater.

Chemical Composition
(%max., unless shown as range or min.)

Ni + Co Cu Fe Mg Si C S
Min./Max. 63 28.0-34.0 2.5 2.0 0.5 0.3 0.024

Applicable Specifications

Product Specification
Bar ASTM B 164, ASTM B 564, ASME SB 164,

ASME SB 564 SAE AMS 4675, DIN 17754

Plate ASTM B 127, ASME SB 127, BS3072NA13,

SAE AMS 4544, DIN 17750, QQ-N-281

Rod, Welding ASTM SB 127, ASTM B 164,

ASME SB 164, QQ-N-281

Sheet ASTM B 127, ASME SB 127, BS3072NA 13,

DIN 17750, SAE AMS 4544, QQ-N-281

Strip ASTM B 127, ASME SB 127, BS3073NA13,

SAE AMS 4544, DIN 17750, QQ-N-281

Common Fabrication Processes
K400 is generally softer then many steel alloys, and can be forged into nearly any shape. This includes:

  • Pumps and Shafts
  • Valves
  • Rings and Discs
  • Fasteners
  • Tanks (gasoline and freshwater)

Industries that Commonly use K400 Forgings:

  • Aerospace and Aviation
  • Industrial heat exchangers
  • Boiler feed water heaters
  • Power Generation
  • Marine engineering
  • Oil & Gasoline – tanks
  • Freshwater tanks
  • Chemical & hydrocarbon processing equipment