Monel alloy, as a unique nickel-based corrosion-resistant alloy, has been widely used in chemical industry, marine engineering, and aviation since its birth due to its excellent corrosion resistance, good processability, and stability in high temperatures and extreme environments. Aerospace and other fields have shown an irreplaceable role. This article will provide an in-depth introduction to Monel alloy.
Detailed Introduction to Monel Alloy:
As one of the earliest applied corrosion-resistant nickel alloys, the produced Monel alloy has a composition of Ni-30Cu. Nowadays, Monel alloys produced in various countries also contain small amounts of iron, manganese, and other elements. The corresponding Chinese grade is 28-2.5-1.5 nickel-copper alloy (designated as NCu28-2.5-1.5). Its main composition is: copper 27.00% to 29.00%, iron 2.00% to 3.00%, manganese 1.20% to 1.50%, and the balance is nickel.
Other Monel-type alloys include Monel K 500, cast Monel, and S Monel. Monel K 500 alloy contains 3% aluminum, which can form the strengthening phase NiAl, enabling age-hardening, resulting in a higher strength than typical Monel alloys, hence the name high-strength Monel. Cast Monel alloy and S Monel alloy are used for producing castings. Although their compositions differ, both contain relatively high silicon content (2% to 5%) to improve their castability and wear resistance.
Monel alloy exhibits excellent corrosion resistance in various media, remaining stable in air, soil, fresh water, and seawater. Its corrosion rate in soil is no greater than 0.0003mm/a, and in seawater, it is 0.03mm/a. Monel alloy also demonstrates good corrosion resistance in non-oxidizing acids (such as sulfuric acid, hydrochloric acid, phosphoric acid, and hydrofluoric acid), salt solutions, and organic acids. However, its corrosion resistance significantly decreases in the presence of aerated media or oxidizing agents. At room temperature, its corrosion rate is less than 0.5mm/a in sulfuric acid concentrations below 80% and hydrochloric acid concentrations of 20%. In medium concentrations of phosphoric acid and hydrofluoric acid, Monel alloy remains stable up to boiling temperatures, second only to platinum and silver in terms of stability. Yet, it is sensitive to stress corrosion and should undergo stress relief treatment before use.
Apart from its excellent corrosion resistance, Monel alloy also possesses good mechanical properties and workability, maintaining its room temperature strength even at 400°C. In the cold-rolled state, its tensile strength can reach 600-700MPa. Monel K 500, on the other hand, boasts even higher strength, with a tensile strength of 980-1120MPa in the cold-rolled state.
Monel alloy is suitable for use as structural materials for chemical equipment operating in corrosive media with low concentrations of sulfuric acid, hydrochloric acid, acetic acid, or phosphoric acid. Monel K 500 is utilized for the fabrication of components requiring high strength, such as marine propeller shafts, impellers, and pump shafts. Cast Monel and S Monel alloys are employed for parts requiring both corrosion resistance and wear resistance, like valve seats and friction components.
Why Choose Huaxiao Alloy?
Thank you for reading our article and we hope this introduction to Monel alloy will be helpful to you. If you are looking for Monel alloy suppliers and manufacturers online now, we would advise you to visit Huaxiao Alloy.
As a leading supplier of Monel alloys from Shanghai China, Huaxiao Alloy offers customers high-quality Monel K500 and Monel 400 at a very competitive price.
