During the use of small-diameter thick-walled steel pipe, if it encounters hot brittleness, it will affect everyone's normal use. What is the reason for the hot-brittleness of small-diameter thick-walled steel pipe?
Due to the different expansion indices of the joints of the small-diameter thick-walled steel pipe, a large internal stress will be generated when heated, especially when the temperature changes sharply or after several times of heating, thermal fatigue cracking will occur. However, it is different from a kind of high temperature fatigue, which is caused by transformation at high temperature due to external force, and the former is hot embrittlement caused by temperature changes caused by internal stress.
For the safety accident of stainless steel welded pipe intergranular corrosion engineering project, after macroeconomic verification, it can be concluded that only part of the welded steel pipe is partially corroded by the equipment and components damaged by intergranular corrosion. For some substances, some not only have more serious intergranular corrosion, but also have quite serious general corrosion.
When small-diameter thick-walled steel pipes are hot and brittle, appropriate methods must be used to deal with them.
In the production process of small-diameter thick-walled steel pipes, it is very important to carry out heat treatment effectively. If heat treatment is done well, the performance of small-diameter thick-walled steel pipes will be guaranteed. So how should small-diameter thick-walled steel pipes be properly heat treated?
Cooling: Simply put, this is a solution, the stainless steel pipe is cooled after cooling to harden. From the production and manufacture of vintage Japanese knives to the entire production process. Of course, not everything is getting colder. Different grades of stainless steel pipes have heating temperature, maintenance time and relative cooling method. The most commonly used stainless steel pipe is selected for the martensitizing temperature, so that it becomes an austenitic structure and obtains high toughness. In the end, it was forced to become a necessary institution.
Hardening: This is a heat treatment method in which stainless steel pipes are heated and cooled with a delay in order to soften or relieve their internal stress. Of course, this also includes heating temperature, maintenance time and cooling method. Raw materials that are not laser-cuttable can be quenched. Based on laser cutting deformed castings, this problem can also be eliminated depending on the quenching situation. Therefore, this is a very important method of processing.
Hardening: When only cooling is performed, the harder it is, the more brittle it becomes due to the cooling effect, and the deformation is caused by internal stress. Quenching is carried out to better solve this problem. In other words, the external economic structure is the deformation or settling of cold, cold and hot stainless steel pipe raw materials, and can be stably constructed. To make the above construction better, it is heated to a certain temperature, and then the actual operation on it is quenching. High-alloy steel, expressed as high-speed tool steel, shows strength without reducing strength when quenched.
Post time: Jun-02-2022