1. Using copper sulfate to identify, first remove the oxide layer on the outer layer of stainless steel, and then drip water on it. If copper sulfate is used to scrub, the stainless steel will turn purple after wiping. At this time It is proved that this is high manganese steel, and that with magnetic properties is ordinary steel or low alloy steel.
2. Use magnets to identify. Chromium stainless steel is very magnetic, and it can be attracted by magnets no matter what state it is in. Chromium-nickel stainless steel is non-magnetic during annealing, and will become magnetic after cooling construction, while high-manganese steel contains manganese. High, so the identification method without magnetism is very convenient and does not require professional supplies.
3. From the color identification, there is a difference in the color of the stainless steel surface cleaned by acid. For example, the color of chromium-nickel stainless steel is silvery white, and the color of chromium stainless steel is off-white. The outer color of stainless steel is brown-white for chromium-nickel steel, brown-black for chrome steel, and black for chromium-manganese-nitrogen.
