How Many Models Of Stainless Steel Are There?

It is generally divided into 5 categories, namely martensite, ferrite, duplex, austenite and precipitation hardening. Common 201, 301, 304, etc. are in the range of austenite, they are not magnetic, while 410, 430, etc. are in the range of martensite, which is very magnetic. Most of the stainless steel usually used is 304 stainless steel, which is widely used in food storage, industrial equipment and other fields.

Second, how to identify stainless steel materials?

1. Using magnets to identify, chromium stainless steel is very magnetic, and can be attracted by magnets no matter what state it is in. However, chromium-nickel stainless steel is not magnetic during annealing, and will have magnetic properties after cooling and construction, while high-manganese steel is very strong. High, so there is no magnetism. This identification method is very convenient and does not require professional supplies.
2. From the perspective of color identification, there is a difference in the appearance of stainless steel cleaned by acid. For example, the color of chromium-nickel stainless steel is silver white, and the color of chromium-nickel stainless steel is gray-white. The outer color of stainless steel is brown-white for chrome-nickel steel, brown-black for chrome-steel, and black for chrome-manganese-nitrogen.
3. Use copper sulfate to identify, first remove the oxide layer on the outer layer of stainless steel, and then drip water on it. If it is scrubbed with copper sulfate, the stainless steel will turn purple after rubbing, which proves that it is high manganese. Steel, or ordinary steel or low-alloy steel with magnetic properties.