Quenching oil is the most widely used cooling medium in the heat treatment quenching process for a long time. Although quenching oil has many unique cooling characteristics, it also has problems such as energy consumption, environmental pollution and fire hazards. First of all, the quenching oil consumed in the quenching process is a precious petroleum … Read more

Among the various corrosions of stainless steel, the intergranular corrosion accounts for about 10%. It will reduce the bonding force between the grains. Under the action of stress, it is easy to crack and even break into powder, and it is very hidden. It is not visible on its appearance. At the same time, it … Read more

Improving the cleanliness of the cast slab is the basis for the production of high-quality steel, and the total oxygen content of the cast slab is an important measure of the cleanliness of the molten steel. Reducing the total oxygen content of the cast slab is mainly carried out from three aspects: converter process, refining … Read more

 1.1 Overview In 1958, H.F. Shroyer invented the technology of making metal castings with expandable foam plastic models and obtained a patent. The model used at first was made of polystyrene (EPS) board and molded with sand containing binder. The German companies Grunzweig and Harrtmann purchased this patent and developed and applied it. The technology … Read more

   Generally, clean steel refers to a steel grade that has a low content of five major impurity elements (S, P, H, O, N) in steel, and strictly controls non-metallic inclusions (oxides, sulfides) in the steel. The general measures to reduce the content of [H], [O] and [N] in steel include: 　　1, [H] content 　　(1) … Read more

As a measure to reduce the friction between automobile engine parts, it can be roughly divided into the following three types. One is to reduce the actual contact area between components; The second is to make low shear stress between parts; The third is to reduce the input load between components. Reducing the surface roughness … Read more

Oxidized pellets have good mechanical strength and metallurgical properties, and have become an indispensable high-quality charge for blast furnace ironmaking. However, the lack of domestic supply of magnetite concentrate has caused many domestic steel plants to use imported hematite to produce oxide pellets. Compared with magnetite pellets, hematite pellets have a high roasting temperature and … Read more