Guide

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

As we all know, the hydrogen in the material will be trapped at various trap positions (dislocations, grain boundaries, precipitates and inclusions, etc.). The heating analysis method is a very important analysis method, which can quantitatively separate and determine the hydrogen trapped at these trap positions. The previous analysis methods include electrochemical hydrogen transmission method, … Read more

It is necessary for a professional foundry person to know this scrap knowledge!  Scrap steel is a general term for ferrous metal scrap in scrap metal recycling. It includes several categories such as scrap steel, scrap iron, slag steel, and oxidized scrap. There are more than a dozen varieties such as carbon scrap, alloy scrap, … Read more

One table to understand the heat treatment of steel products: Name Heat treatment process Purpose of heat treatment 1. Annealing Heat the steel to a certain temperature, keep it for a certain time, and then slowly cool it to room temperature ①Reduce the hardness of steel and increase plasticity to facilitate cutting and cold deformation … Read more

 1. Appearance, size and fit of the molded product 1. Defects on the product surface are not allowed: lack of material, burnt, top white, white line, peaking, blistering, whitening (or cracking, breaking), baking, and wrinkles. . 2. Welding mark: Generally, the length of circular perforation weld mark is no more than 5mm, and the length … Read more

 1. Stoma     This is a small cavity formed by the gas that has not escaped during the solidification process of the metal. Its inner wall is smooth, contains gas, and has a high reflectivity to ultrasonic waves, but because it is basically spherical or ellipsoidal, That is, it is a point-shaped defect, which … Read more

    Carburizing and quenching is actually a composite process, namely carburizing + quenching. We are often used to talk about the two together, because the two processes that are completed on the same equipment are the most commonly encountered in production (but there are also carburizing air cooling, carburizing slow cooling and then reheating … Read more

 1. Graphitization process of cast iron     The formation process of graphite in cast iron is called graphitization process. The basic process of the structure of cast iron is the formation process of graphite in cast iron. Therefore, it is very important to understand the conditions and influencing factors of the graphitization process to … Read more

 The 690 alloy tube used for the steam generator heat transfer tube of nuclear power plant bears the corrosion of high temperature, high pressure and water medium, alloy grain size, intergranular Cr depletion, intergranular carbide and its force on stress concentration. The academic effect is an important factor that affects the intergranular corrosion and stress … Read more

   Duplex stainless steel has the same proportion of ferrite and austenite, and has excellent mechanical properties and corrosion resistance. It is widely used in petrochemical, transportation, marine engineering and other fields. 2205 duplex stainless steel is a typical representative of the second generation of duplex stainless steel, and the proportion of global production and … Read more