(1) When the cooling is completed, that is, when the temperatures of the surface layer and the core part are all the same, the elastic deformation of the surface layer and the core part also disappears and returns to the original state. Although transient thermal stress is generated during the cooli

Before the steel is hot rolled, heating the raw material not only improves the mental plasticity, reduces the deformation force, but also facilitates rolling. In addition, during the heating process of the steel, some structural defects and stresses caused by the ingot can also be eliminated for the

In our life, the use of spiral steel pipe is very extensive, which can be used in almost every industry, such as drainage, water supply, gas transportation, petroleum gas, liquefied gas, coal gas, etc. As a building structure, there are many uses, and the stability of the spiral steel pipe is also v

Thick-walled steel pipes are specified in the project:Corresponding regulations and various regulations for the practical selection and use of thick-walled pipe fittings. When thick-walled steel pipe and thick-walled pipe fittings are selected or used, they must first follow the corresponding regula