Stainless steel 304 heat treatment process
Stainless steel 304 heat treatment process, 304 stainless steel in our daily life is very common, almost everyone can contact, the following you follow me to take a look at the heat treatment process of stainless steel 304 related to the knowledge of the process, I hope to help you can be helpful.
Stainless steel 304 heat treatment process 1Heat treatment process: 304 stainless steel pipe in the solid solution treatment of the temperature to go through 1080 to 1100 degrees Celsius or so, after which the cooling method is to pass through the water cooling method or air cooling method. The middle of the cold working process to go through the annealing, its temperature is generally about eight or nine hundred degrees Celsius, the final insulation stage after a certain period of time and then enter the water-cooled stage.
304 stainless steel pipe is used for food equipment, chemical company bar and some atomic energy industry equipment, etc. Compared with the 200 series of stainless steel materials, 304 stainless steel pipe has relatively good performance of high temperature resistance, and it can reach more than one thousand degrees Celsius.
304 stainless steel pipe also has strong corrosion resistance, 304 stainless steel pipe into the strong acid environment or strong alkali solution, still has good corrosion resistance.
Extended Information
For 304 stainless steel, the Ni element in its composition is very important, directly determining the corrosion resistance of 304 stainless steel and its value.
The most important in 304. Elements are Ni, Cr, but not limited to these two elements. Specific requirements are defined by product standards. Industry common judgment that as long as the Ni content is greater than 8%, Cr content is greater than 18%, can be considered 304 stainless steel. This is why the industry will call this type of stainless steel 18/8 stainless steel.
In fact, the relevant product standards for 304 have very clear provisions, and these product standards for different shapes of stainless steel and some differences. Here are some common product standards and tests.
To determine whether a material is 304 stainless steel, it must meet the requirements of each element in the product standard, as long as there is one does not meet, it can not be called 304 stainless steel.
Stainless steel 304 heat treatment process 2Is stainless steel 304 food grade?
Stainless steel 304 is food grade. 304 stainless steel is a common material in stainless steel, with a density of 7.93
g/cm3, also called 18/8 stainless steel in the industry. High temperature resistance of 800 degrees, with good processing performance, high toughness, widely used in industry and furniture decoration industry and food medical industry.
The common labeling methods in the market are 06Cr19Ni10, SUS304, of which 06Cr19Ni10 generally indicates that the national standard production, generally indicates that the ASTM standard production, SUS304 indicates that the Japanese standard production.
What are the characteristics of 304 stainless steel
1, SUS304 is an 18-8 system of austenitic stainless steel, usually used as a stamping washer class fasteners. Because of its stamping in the various parts of the material deformation degree varies, about between 15% ~ 40%, so the degree of work hardening of the material also varies.
2, SUS304 stainless steel sheet cold working, microscopic slip surface and grain boundaries will produce a large number of dislocations, resulting in aberrations in the dot matrix. The larger the amount of distortion, the higher the density of dislocations, the more serious the internal stresses and matrix distortion, so that the metal deformation resistance and strength, hardness and so on with the degree of deformation and increase, plasticity index elongation, section shrinkage decreased.
3, when work hardening to a certain extent, such as continuing deformation, there is a risk of cracking or brittle fracture, after molding its residual stress is very easy to cause the workpiece self-destruct rupture. In the environmental atmosphere, placed for a period of time, the workpiece will automatically produce intergranular cracking (usually called "seasonal cracking"). Therefore, in the SUS304 stainless steel stamping and forming process, generally must be carried out between the process of soft annealing,
that is, intermediate annealing, in order to eliminate residual stresses, reduce hardness, restore the plasticity of the material, in order to be able to carry out the next process.
Is stainless steel 304 food grade? It is indeed food grade and is quite widely used in daily life. In addition, in the daily life of the goods, the choice of tableware must pay more attention, especially brightly colored porcelain bowls, most of which are toxic, and if you use this kind of thing often, it will definitely have a negative impact on the body.