Monel alloy

Monel alloy, also known as nickel alloy, is an alloy made by adding copper, iron, manganese and other elements to nickel metal as the base. Monel alloy has good corrosion resistance, silvery white color, suitable for edge wire material The composition of Monel alloy is Ni-30Cu, and the Monel alloy produced by various countries today also adds a small amount of iron, manganese and other elements. The corresponding grade in China is 28-2.5-1.5 nickel-copper alloy (code name NCu28-2.5-1.5. Its main components are: copper 27.00%-29.00%, iron 2.00%-3.00%, manganese 1.20%-1.50%, the balance of nickel. K Monel alloy contains 3% aluminum, which can form the strengthening phase NiAl, and can be strengthened by aging, and its strength is higher than the general Monel, so it is called high strength Monel. Casting monel and S monel alloys are used to produce castings. Both have different compositions but contain higher silicon (2% to 5%) to improve their castability and wear resistance. Monel alloy has good corrosion resistance in a variety of media, and it is stable in air, soil, fresh water and seawater. The corrosion rate in soil is no more than 0.0003mm/a; the corrosion rate in seawater is 0.03mm/a. Monel alloy also has good corrosion resistance in non-oxidizing acids (sulfuric acid, hydrochloric acid, phosphoric acid, hydrofluoric acid), salt solutions and organic acids. However, the corrosion resistance decreases significantly in ventilated media or in the presence of oxidizing agents. At room temperature, the corrosion rate is less than 0.5mm/a in sulfuric acid of less than 80% concentration and hydrochloric acid of 20% concentration. it remains stable up to boiling point temperature in phosphoric acid and hydrofluoric acid of medium concentration, second only to platinum and silver. However, it is sensitive to stress corrosion and should be treated with stress relief before use. In addition to good corrosion resistance, Monel alloy also has good mechanical and processing properties, and at 400 ℃ can still maintain its strength at room temperature. The tensile strength in the cold-rolled state can reach 600-700 MPa, and the strength of K monel is even higher, with the tensile strength in the cold-rolled state reaching 980-1120 MPa. Monel alloys are suitable for use as structural materials for chemical equipment working in corrosive media such as sulfuric acid, hydrochloric acid, acetic acid or phosphoric acid, etc. K Monel is used to make components with high strength requirements, such as marine propeller shafts, impellers and pump shafts, etc. Cast Monel and S Monel are used for components requiring corrosion and wear resistance, such as valve seats, friction parts, etc.

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