What are the differences between the ferritic 430 stainless steel and the austenitic 304, 316 stainless steels?
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430 ferritic stainless steel: Steels with a chromium content of over 12% can resist oxidation caused by natural factors; such metals are known as stainless steels. They belong to the 430 ferritic stainless steel category, featuring a low coefficient of thermal expansion, as well as excellent formability and oxidation resistance. It is designated as 430 under JIS standards, which is why it is also known as 430 stainless steel. Applications of 430 ferritic stainless steel: 430 stainless steel (16Cr) is commonly used in the manufacture of household appliances, heat-resistant utensils, burners, home appliance products, category 2 tableware, kitchen sinks, exterior decorative materials, bolts, nuts, CD rods, and screens. Differences between 430 stainless steel and 304, 316 austenitic stainless steels: 430 stainless steel is identified from 304 and 316 austenitic stainless steels through spectral analysis and chemical element analysis. Both 304 and 316 are austenitic stainless steels; 316 is made by adding molybdenum to 304 stainless steel, which is why its resistance to rusting in seawater is much better than that of 304. The difference between 304, 316, and 430 lies in their rust resistance. Since 304 and 316 contain elements such as nickel and molybdenum in addition to chromium, and they are non-magnetic, the rust resistance of these 304/316 austenitic stainless steels is much better than that of 430 stainless steel; moreover, their price is also much higher. Can a 430 stainless steel magnet hold things? 304 and 316 are non-magnetic and cannot be attracted by magnets. Generally, it does not generate heat in high-voltage electromagnetic environments, which is why it is widely used. Martensitic and 430 ferritic stainless steels, as well as precipitation-hardening stainless steels, are magnetic and can be attracted by a magnet. Does 430 stainless steel rust? 430 stainless steel cannot resist oxidation caused by chemicals in the air. As there are increasingly more acidic chemicals in the air, 430 stainless steel will still oxidize (rust) due to non-natural factors after being used for a period of time. Which is better, 430 stainless steel or 304? 304 austenitic stainless steel has excellent corrosion resistance and is non-magnetic. Relatively speaking, austenitic stainless steel 304 is better than ferritic stainless steel 430. How much more expensive is 430 stainless steel compared to 304? Generally speaking, austenitic stainless steel 304 is twice as expensive as stainless steel 430.
The differences between 430 stainless steel and austenitic stainless steels such as 304 and 316 lie mainly in their rust resistance and composition. 430 stainless steel is a ferritic stainless steel with a chromium content of over 12%. It has a low coefficient of thermal expansion, as well as good formability and oxidation resistance. It is commonly used in the manufacture of household appliances, heat-resistant utensils, kitchen sinks, etc. 304 and 316 are austenitic stainless steels; in addition to chromium, they also contain elements such as nickel and molybdenum, which gives them good rust resistance and makes them non-magnetic. 316 has better resistance to rust in seawater due to the addition of molybdenum. Therefore, 304 and 316 austenitic stainless steels have better rust resistance than 430 stainless steel, but their price is also relatively higher. Generally, the price of 304 austenitic stainless steel is about twice that of 430 stainless steel. .
I’ve learned about it. As for what the original poster’s teacher mentioned regarding which material is better or worse, I can’t agree with that; the properties of the two materials are different and their applications vary. 430 is less resistant to acid corrosion than 304, while 304 has lower hardness than 430. Each material has its own uses and advantages.