1. What are the application advantages of JYH21CT stainless steel over 304 stainless steel? Is it safe to apply to tableware and utensils?
Compared with 304 stainless steel: JYH21CT stainless steel has the same corrosion resistance as 304: JYH21CT stainless steel does not contain Ni, and the relative cost is lower: JYH21CT is a ferritic stainless steel with magnetic permeability: JYH21CT stainless steel has better thermal conductivity than 304, so It is more energy-saving than 304 when used in pot products. At the same time, if it is used in frying pan products, because JYH21CT contains Ti, it effectively suppresses the production of 275 brittleness (the brittle carbon chromium compound precipitated by stainless steel at 240-380). Effectively delay the aging of materials and increase the service life of products. JYH21CT stainless steel is safe for tableware and utensils, JFE technical guarantee, verified by many authoritative domestic testing institutions, and various testing indicators far exceed national standards.
2. Which type of vessel is JYH21CT stainless steel suitable for replacing 304? What are the advantages in production?
In the production process, the products formed by the material flow method can generally be replaced, such as stretched straight type vessels and slightly flared and slightly expanded type vessels. The JYH21CT material has good fluidity during stretching, and the practical ultimate stretch ratio reaches 2.36, which is better than the 304 ultimate stretch ratio of 2.21. The same product, because JYH21CT is a ferritic stainless steel, there is no martensite transformation during stretching After stretching, there is no tissue stress, and the probability of aging cracking is lower than that of 304 (the main cause of cracking after 304 stretching is caused by tissue transformation).
3. What are the requirements of JYH21CT stainless steel for the mold during production?
JYH21CT has a higher yield strength and a lower tensile strength than 304. It is prone to cracking at the R corner with greater shear stress. Therefore, if the original mold for 304 is trial-produced, the material at the R corner will break when JYH21CT is tested. R angle is enough. In practice, most of the production of small expansion vessels can share the mold with 304.
4. How to predict whether JYH21CT stainless steel can successfully replace 304 in micro-flared and micro-expanded products?
Practice shows that according to different product shapes and sizes, when the expansion line deformation of most products is within 8~15%, the material strength and extension are safe. As the larger the amount of deformation of the product, the greater the stress caused by the lattice distortion. Therefore, for products with large deformation, the less expansion type or the non-expansion type should be selected as much as possible.
5. Compared with 304, how to adjust the polishing process when using JYH21CT stainless steel?
Since JYH21CT is ferritic stainless steel, the slip line is obvious after stretching. Therefore, after stretching, JYH21CT has a rougher surface than 304. Therefore, when polishing, the polishing difficulty is slightly more difficult than 304. Sanding, and increasing the speed of polishing abrasives to solve, the surface finish after polishing can be significantly better than 304.
6. What should I pay attention to before packaging JYH21CT products?
In practice, occasionally rust phenomenon was found on sanded surface products. After testing and analysis, the cause of rust was poor cleaning after polishing, which was caused by the adhesion of polishing material powder. Therefore, in order to avoid misunderstandings, the product should be done before packaging the finished product Cleaning work.
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