Houseware stainless steel can be divided into three grades: 430, 304 (18-8), and 18-10.
430 stainless steel:
Iron More than 12% of chromium can prevent oxidation caused by natural factors. It is called stainless steel. The code name in jis is No. 430, so it is also called 430 stainless steel. However, 430 stainless steel cannot resist oxidation caused by chemicals in the air. After 430 stainless steel is not often used for a period of time, it will still be oxidized (rusted) due to unnatural factors.
18-8 stainless steel:
iron 18% chromium 8% nickel, which can resist chemical oxidation. This stainless steel is 304 in the jis code, so it is also called 304 stainless steel.
18-10 stainless steel:
However, there are more and more chemical components in the air, and some places with more serious pollution will even rust 304; therefore, some high-end products will be made with 10% nickel to make them more durable and corrosion-resistant. , This kind of stainless steel is called 18-10 stainless steel. In some tableware instructions, there is a saying similar to “using the most advanced medical stainless steel material of 18-10”.
Stainless steel can be divided into three categories according to the metallographic structure: austenitic stainless steel, ferritic stainless steel and martensitic stainless steel. The main components of stainless steel are iron, chromium, and nickel alloys. In addition, it also contains trace elements such as manganese, titanium, cobalt, molybdenum and cadmium, which make the stainless steel stable, rust-proof and corrosion-resistant. Austenitic stainless steel is not easy to be magnetized due to the particularity of the internal molecular structure.
