Welcome to Shandong Zhishang Steel Co., Ltd.
Welcome to Shandong Zhishang Steel Co., Ltd.
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Qualified 304 stainless steel is a high-quality material, it should not precipitate heavy metals at any temperature. This means that whether you use this stainless steel product in the cold winter or in the hot summer, there will be no heavy metal ions released into your food or drinking water. However, unqualified stainless steel products may precipitate heavy metal ions in their water under specific conditions, such as acid, alkali and salt. Although temperature has some effect on these processes, the effect is negligible.
Time is the main factor. Therefore, it is not recommended to buy products such as thermos cups and water cups on the ground, because they may not meet the quality standards. In contrast, everyday items such as cutlery, vegetable basins and washbasins can be bought and used with confidence. These items are in contact with water and food for a relatively short time, and most of the dissolved matter or rust is removed during scrubbing. Therefore, their health effects are very weak, and even the amount of heavy metals ingested in a few years is not as much as a plate of stir-fried bracken.
As for the change of 304 stainless steel at different temperatures, it will turn slightly yellow at 150 ° C, significantly yellow at 250 ° C, and seriously yellow at 350 ° C. When the temperature reaches about 400 ° C, the stainless steel will become colored and appear yellow. These problems are not major and are usually caused by the oxidation of iron to iron oxide.
In addition, the color change phenomenon is caused by the formation of oxides of chromium-nickel elements. When you make acidic food with this stainless steel, these oxides may be dissolved and migrate into the food. Therefore, when choosing stainless steel products, it is very important to ensure that they are qualified products that meet the standards.
304 stainless steel plate and Q345 carbon steel plate can be welded. The welding of stainless steel and Q345 belongs to the welding between low carbon steel and austenitic stainless steel in this kind of dissimilar steel welded joint, due to its working conditions have intergranular corrosion and stress corrosion problems, usually choose E309 type welding material, but when the welding joint is in a higher temperature environment (design temperature ≥315℃), In order to prevent the migration of carbon during the working process, welding materials with a high nickel alloy content (such as InCONel 182 electrode, etc.) are usually used.
As a widely used material, stainless steel has many excellent performance characteristics. First of all, the corrosion resistance of stainless steel is very good. Due to its chromium element, the stainless steel surface forms a dense chromium oxide protective film, which effectively prevents the metal from contacting with corrosive media such as air and water, thus significantly extending the service life of the material.
Secondly, stainless steel has good high temperature resistance. Under high temperature environment, stainless steel can still maintain stable performance and is not easy to deform or melt. This makes stainless steel in the industrial field has a wide range of applications, such as the manufacture of stoves, boilers, heat exchangers and other equipment.
In addition, stainless steel also has good strength and hardness. Its high strength and high hardness make the stainless steel perform well when bearing heavy loads and shocks, and it is not easy to break or deformation. Therefore, stainless steel is often used in the production of building structures, auto parts, medical equipment and other fields.
In addition, stainless steel also has good machinability and weldability. It can be cut, stamped, bent and other operations through various processing processes, and is easy to weld with other metal materials, which facilitates the manufacture and maintenance of products.
Finally, stainless steel also has a beautiful and generous appearance. Its smooth surface and silver-white color make it an ideal decorative material, which is widely used in kitchen utensils, home appliances, architectural decoration and other fields.
In summary, stainless steel shows excellent performance characteristics in corrosion resistance, high temperature resistance, strength and hardness, machinability and weldability, as well as aesthetics, making it an indispensable and important material in many fields.
