Development status of alloying element addition technology

At present, the main technology of alloying element addition in China includes intermediate alloy addition and alloying element additive addition. The technology of adding intermediate alloy began to be used in China from 1950s to late 1960s.In terms of social benefits and material performance indexes, the intermediate alloy addition technology belongs to the repetitive production process, that is, the manufacturing process of the intermediate alloy and the final alloy material highly overlaps, but the intermediate alloy products contain a higher proportion of added elements. The manufacture of intermediate alloy needs to raise the hot melting temperature to the melting temperature of high melting point metal to complete the production, which not only causes high energy consumption and raw material consumption, but also correspondingly leads to the increase of air pollution and carbon emissions. And the intermediate alloy itself as the product of high temperature melting, the low melting point metal in the manufacturing process is easy to burn and produce impurities, resulting in the reduction of the purity of the final alloy material, affecting the final performance of the material. At present, the way of adding alloying elements in the form of intermediate alloy has been gradually eliminated in China. At present, intermediate alloy products are mostly used in small-scale aluminum alloy factories with less advanced technology and those which cannot be overcome by alloying element additives.

With the continuous deepening of China's research in the field of materials, foreign advanced non-ferrous metal preparation technology and equipment into China, China's material industry has made certain progress.After entering the 21st century, China's manufacturing industry into the high-speed development of the fast lane, in order to ensure the steady development of the basic materials in China, in turn, pave the way for manufacturing industry transformation and upgrading, countries have introduced policies to promote technology breakthroughs were made in the field of new materials alloy downstream market demand is also in reverse to promote our country to improve the application of metallic functional materials technology development.Therefore, under the situation that the form of adding intermediate alloy is becoming more and more malpractice, the technology of adding alloy element additive began to be tested in China in the mid-1990s, and began to be tried out successively around 2000.Compared with the production mode of intermediate alloy smelting and electromagnetic induction furnace, there is no high temperature melting process in the preparation of alloy element additive, which is a pure physical and chemical process, and the production environment is relatively green.Compared with the proportion of alloying elements below 20% or even lower of the intermediate alloy, the proportion of alloying elements in the alloy element additive can generally reach more than 75% (some enterprises alloy element additive products can reach 95% or even higher), with lower impurity content and melting temperature, and higher yield.Compared with intermediate alloy technology, alloy element additive technology has obvious advantages in improving manufacturing efficiency, reducing material burn loss and improving alloy material properties.

As high-end manufacturing, to the promotion of alloy material performance requirements as well as the advance of new material technology itself, the downstream aerospace, military industry, shipbuilding, rail transportation, automobile and other fields of aluminium alloy, alloy steel, magnesium alloy, titanium alloy, alloy material purity, metal fatigue resistance, indices such as components in the uniform distribution of alloying after the demand is higher and higher,Alloy forms of alloy elements added in the middle transition to additive alloy elements form, and development trend as follows: (1) compared with the intermediate alloy technology, alloy elements adding technology in the preparation, application effect, environmental protection and energy saving efficiency has significant advantages, alloy element additive technology has fully replace the middle add technology trend;(2) alloy element additives products and technology more mature, gradually from low concentration alloy element additives to a new generation of high concentration alloy element additives, such as the market from about 2000 Fe75, Mn75, Si50, Ti75, to 2010 Fe85, Mn85, Cr80, etc.,Recently, some competitive enterprises have introduced alloy element additives with higher concentration, such as Fe97, Mn93, etc.(3) A large number of oxides, nitride and hydrides will be produced when part of the low melting point matrix metal is melted with high temperature alloy elements at high temperature, which reduces the purity of the alloy and leads to metal fatigue. In order to ensure the uniform distribution of alloy elements after alloying, improve the performance of the material, and achieve the purpose of energy conservation and environmental protection,To achieve shorter time and lower temperature melting of alloy elements is the key factor to improve the quality of alloy.(4) With the continuous expansion of the application field of alloy materials, the requirements for special properties of alloy are more diverse, so that a single type of alloy element additives can not meet all the requirements of alloy material properties, and the development of compound alloy element additives has become the focus of the market research direction.

Than traditional middle alloy addition technology, through physical and chemical process of the preparation of alloy element additives in the production and application of link more energy conservation and environmental protection, through reduce melting temperature, melting time and other means to further control solution impurity content, thus improve the quality of the alloy in the end performance, alloy processing in China and other obvious role in promoting the development of the non-ferrous metals industry.Manufacturing industry is the main position of energy saving and carbon reduction, and carbon reduction transformation is an inevitable requirement for the steady progress of China's green and low-carbon strategy.But in promoting the strategy under the background of manufacturing power, to achieve energy conservation and emissions reduction and the development of the industry quality coordinated development is a challenging task, represented by high concentration of additive alloy elements of a new generation of "green and efficient" additive alloy elements in further improve the quality of alloy material performance, the at the same time, the development of the downstream manufacturing high quality alloyTo make the process end more green, the application end more energy saving, effectively reduce the carbon emissions and material loss in the process of alloy smelting, is an effective solution for the coordinated development of low carbon green and high quality metal functional materials and alloy materials.With the continuous promotion of China's "double carbon" action strategy and manufacturing power strategy, high concentration alloy element additives may welcome greater opportunities for development.