However, because the chromium content of 430 stainless steel is much less than that of 304, its hardness is not as good as that of 304. However, 430 stainless steel is not food-grade stainless steel at all. More often, stainless steel is made of recycled scrap iron, steel, lead and other materials, which are processed in the secondary furnace and then processed through a series of treatments.
430 stainless steel and 304 stainless steel ≠ food grade stainless steel belong to food grade stainless steel only if they meet the national GB9684 standard certification and can really come into contact with food without causing physical injury.
Regular manufacturers generally use 304 (18-8) and 430 (18-0) stainless steel as spork. 430 is magnetic and 304 is micro-magnetic. Therefore, when buying stainless steel tableware, it is easy to judge with magnets.
Stainless steel products for food are divided into two categories according to their uses. One kind is tableware container, which refers to stainless steel utensils used to hold food, that is, pots, bowls and basins. There is also a kind of stainless steel tableware, which generally touches knives, forks, spoons, chopsticks and other tableware that directly touches food.
The main safety problem of stainless steel for food contact is the migration of heavy metals. Generally speaking, there is no food safety risk when stainless steel products are served, cooked or contacted with food. When the migration of heavy metals in stainless steel products exceeds the standard, it may endanger human health.
430 stainless steel is not food grade, 430 belongs to ferritic stainless steel, which is magnetic and called stainless steel iron. It is used to make knives and other (wear-resistant, hard) tableware. At present, austenitic stainless steel (nonmagnetic or micro-magnetic) is widely used. For example, 20 1 202 30 1 304 (austenite has good corrosion resistance), so 430 stainless steel is not very safe for tableware, because 430 stainless steel is not very safe.
1, corrosion resistance
430 stainless steel contains 16.00- 18.00% chromium and basically contains no nickel metal, while 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 performance
430 stainless steel is ferrite, 304 stainless steel is austenite and 304 stainless steel is more stable than 430 stainless steel.
3. Toughness
The toughness of 304 stainless steel is stronger than that of 430 stainless steel.
4. Thermal conductivity
Ferrite of 430 stainless steel has better thermal conductivity than austenite of 304 stainless steel.
5, mechanical properties
Due to the addition of stable chemical element titanium, the mechanical properties of 430 stainless steel are better than those of 304 stainless steel.
Application fields of 430 stainless steel:
1 and 430 stainless steel are mainly used in building decoration, oil burner parts, household appliances and household appliances.
2. 430F steel grade with easy cutting performance is added to 430 stainless steel, which is mainly used for automatic lathes, bolts and nuts.
3. Adding Ti or Nb to 430 stainless steel can reduce the C content to 430LX, and improve the processability and welding performance. Mainly used in hot water tank, hot water supply system, sanitary ware, household durable appliances, bicycle flywheel, etc.
304 stainless steel application fields:
1 and 304 stainless steel have the characteristics of high temperature resistance, good processability and high toughness, and are widely used in industry, furniture decoration industry and food and medical industry.
2. 304 stainless steel has strong corrosion resistance and is widely used to manufacture equipment and parts that require good comprehensive performance (corrosion resistance and formability).
Summary: 304 stainless steel and 430 stainless steel have their own advantages.
430 stainless steel has good thermal conductivity and mechanical properties, and performs better in the fields of building decoration, oil burner parts, household appliances, household appliances and so on.
304 stainless steel has strong toughness and corrosion resistance, which is better in industries that need corrosion resistance, such as industry, food and medical treatment.