Is 430 stainless steel food grade? What is the difference between 430 and 304 stainless steel?
430 stainless steel: It is called "stainless iron" in the industry because it is a type of ferritic stainless steel, has good corrosion resistance, and has better thermal conductivity than austenitic stainless steel. It is currently mainly used in It is used in normal or high temperature scenarios such as building decoration, some home appliance components, and fuel burner components. However, because the chromium content in 430 stainless steel is much less than that of 304, its hardness is not as good as 304.
It is such a ferritic stainless steel. First of all, it is much inferior to 304 stainless steel in terms of corrosion resistance, and its various performance indicators do not meet the national standards for food-grade stainless steel. No matter how you look at it, , 430 stainless steel is not food-grade stainless steel at all, and more often than not, stainless steel is made by reprocessing recycled scrap iron, steel, lead and other materials through a series of processes.
430 and 304 stainless steel ≠ food-grade stainless steel. Only stainless steel materials that meet the national GB9684 standard certification and can truly come into contact with food without causing physical harm are food-grade stainless steel.
Regular manufacturers generally use 304 (i.e. 18-8) and 430 (i.e. 18-0) stainless steel to make forks and spoons. 430 is magnetic and 304 is slightly magnetic. Therefore, when purchasing stainless steel tableware, you can easily judge it with a magnet.
Stainless steel products for food are divided into two categories according to their uses. One category is tableware containers, which refers to stainless steel utensils used to hold food, that is, pots, bowls, basins, etc. There is also a category of stainless steel tableware, which are commonly used in daily contact with knives, forks, spoons, chopsticks and other tableware that come into direct contact with food.
The main safety issue with stainless steel for food contact is the migration of heavy metals. Generally speaking, stainless steel products do not pose a food safety risk when holding, cooking, or coming into contact with food. When the heavy metals migrating from stainless steel products during use exceed the limit, they may harm human health.
430 stainless steel is not food grade. 430 is ferritic stainless steel, which is magnetic and is commonly known as stainless steel. It is used to make knives, etc. (wear-resistant, hard) and tableware. Currently, austenitic stainless steel (non-magnetic or slightly magnetic) is generally used. ). Such as 201 202 301 304 (austenite has good corrosion resistance), so 430 stainless steel is not very safe for tableware because 430 stainless steel has poor corrosion resistance.
What is the difference between 430 stainless steel and 304 stainless steel?
Comparison between 304 stainless steel and 430 stainless steel:
1. Corrosion resistance: 430 stainless steel contains 16.00-18.00% chromium and basically contains no nickel metal. 304 stainless steel contains more chromium and nickel metal, so the corrosion resistance of 430 stainless steel is not as good as that of 304 stainless steel.
2. Stability: 430 stainless steel is in ferrite form, 304 stainless steel is in austenitic form, and 304 stainless steel is more stable than 430 stainless steel.
3. Toughness: 304 stainless steel has strong toughness, stronger than 430 stainless steel
4. Thermal conductivity: The ferrite of 430 stainless steel has better thermal conductivity than the austenite of 304 stainless steel.
5. Mechanical properties: 430 stainless steel adds the stable chemical element titanium, and the mechanical properties of the welding seam are better than 304 stainless steel.
430 stainless steel use areas:
1. 430 stainless steel is mainly used for building decoration, fuel burner components, household appliances, and home appliance components.
2. Add the easy-cutting steel grade 430F to 430 steel, which is mainly used for automatic lathes, bolts and nuts, etc.
3. Add Ti or Nb to 430 steel and reduce the C content to become 430LX, which improves the processing performance and welding performance. It is mainly used in hot water tanks, hot water supply systems, sanitary appliances, durable household appliances, bicycle flywheels, etc. .
304 stainless steel use areas:
1. 304 stainless steel has the characteristics of high temperature resistance, good processing performance and high toughness. It is widely used in industry, furniture decoration industry and food and medical industry.
2. 304 stainless steel has strong corrosion resistance and is widely used in the production of equipment and parts that require good comprehensive performance (corrosion resistance and formability).
Summary: 304 stainless steel and 430 stainless steel each have their own advantages: 430 stainless steel has good thermal conductivity and mechanical properties. For building decoration, fuel burner parts, household appliances, home appliance parts and other fields, 430 stainless steel is better; 304 stainless steel has many advantages. With strong toughness and corrosion resistance, 304 stainless steel is better in industries that require corrosion resistance such as industry, food and medicine.
