What is the difference between ferro-nickel and ferro-molybdenum
Nickel iron：The main components of nickel-iron are nickel and iron, and also contain Cr, Si, S, P, C and other impurity elements. Nickel is a yellowish silvery white metal, is a magnetic transition metal.
Basic use: stainless steel and alloy production is the most widely used field of nickel iron.
1.The principal function of nickel in stainless steel is that it alters the crystal structure of the steel. One of the main reasons for the addition of nickel to stainless steel is the formation of austenitic crystal structure, which improves the properties of stainless steel such as plasticity, weldability and toughness, so nickel is called the austenitic forming element.
2.The tensile strength and hardness of low carbon structural steels can be increased when nickel content reaches 5%.Carbon steel containing 3% nickel can improve its tensile strength, impact toughness, yield point and deformation ability.
3.Nickel has a slight graphitization in cast iron which stabilizes pearlite and reduces ferrite content. Therefore, nickel in cast iron helps to achieve uniform and integrated structure and good performance. Nickel-added cast iron can be used to make castings in the automotive industry.
Smelting method: wet smelting process and fire smelting process.
Due to the difference of the two main kinds of nickel minerals (nickel sulfide ore and oxide ore) in the world, smelting and processing methods are different. However, the most mature metallurgical methods for smelting nickel-iron alloys from laterite nickel ore are still pyrometallurgy.
No matter what kind of smelting methods, but these several smelting methods show that China has a certain degree of mastery of the smelting technology of nickel-iron.
Molybdenum iron：Ferroalloy consisting of molybdenum and iron, generally containing molybdenum 50 ~ 60%, used as alloy additive in steelmaking.
Basic use:
Used as additive of molybdenum in steelmaking. The addition of molybdenum can make the steel have uniform fine grain structure, and improve the hardenability of the steel, which is beneficial to eliminate the temper brittleness. In high - speed steels, molybdenum can be used in place of some tungsten. Molybdenum, together with other alloying elements, is widely used in the production of stainless steels, heat resistant steels, acid resistant steels and tool steels, as well as alloys with special physical properties. Molybdenum is added to cast iron to increase its strength and wear resistance.
