Waste stainless steel is a high-grade alloy steel, which is higher in value than ordinary scrap steel. It is generally not mixed together in China during recycling. However, some scrap stainless steel is often mixed in scrap steel imported from abroad. In the case of such a situation, the test identification method we can use is:
1. Distinction between toughness and hardness: ordinary scrap steel is soft and tough, easy to bend and not easy to break; chrome stainless steel scrap is hard, slamming can not bend; nickel chrome stainless steel is tough, sniper can not bend.
2, from the oxidation resistance difference: ordinary scrap steel is easy to oxidize and rust, yellow; chrome stainless steel scrap is not easy to rust; nickel-chromium stainless steel scrap is not easy to rust.
3, from the color difference: ordinary scrap black brown; chrome stainless steel scrap after pickling is white; not pickled brownish black; nickel-chromium stainless steel scrap after pickling silver white; not pickled brownish white (chromium manganese Nitrogen steel is black and hard); cold rolled unannealed is silvery white, reflective and hard.
4. Magnetic difference: ordinary scrap can be attracted by magnets under any circumstances; chromium stainless steel is magnetic and can be attracted by magnet; nickel-chromium stainless steel is non-magnetic in annealed state. After cold working, there will be some magnetic properties, but the high manganese and chrome manganese steels with higher manganese content are not magnetic. .
5, from the gloss difference: ordinary scrap steel is not oxidized and shiny; chrome stainless steel scrap is dull; nickel-chromium stainless steel scrap is shiny.
6. Wiping with copper sulfate: The ordinary scrap is purple-red; the chromium stainless steel is not discolored; the nickel-chromium stainless scrap scrapes off the oxide layer, drops a little water, and the copper sulfate does not change color.
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