How should stainless steel distinguish stand or fall

1, with magnet identification: chromium stainless steel in any state can be attracted by magnets; Chrome-nickel stainless steel in the annealing state is generally non-magnetic, after cold working, some will have magnetic; High manganese steel with high manganese content is non-magnetic. Chrome-nickel nitrogen stainless steel has no magnetic, some magnetic, some longitudinal surface without magnetic and transverse surface magnetic.

2, color identification: pickling stainless steel surface color: chrome nickel stainless steel color silver white jade; Chrome stainless steel gray white light moist; Chromium manganese nitrogen stainless steel color and chromium nickel stainless steel similar slightly lighter. The surface color of stainless steel without pickling: chrome nickel steel is brown and white, chrome steel is brown and black, chromium manganese nitrogen is black. Cold rolled unannealed chrome-nickel stainless steel with silver reflective surface.

3, identify with copper sulfate: remove the oxide layer on the steel, put a drop of water, wipe with copper sulfate, such as no color, generally for stainless steel; Such as purplish red, non-magnetic high manganese steel, magnetic steel or low alloy steel.

4, abrasive identification: abrasive identification is the stainless steel in the grinder grinding, view of the spark. If the spark is linear and there are more dense nodes, it is high manganese steel or manganese nitrogen steel with high manganese content. If there is no section flower is chrome steel or chrome nickel stainless steel.

5, chemical qualitative method identification: chemical qualitative method is to identify whether magnetic stainless steel contains nickel in a method of identification. The method is to dissolve small pieces of stainless steel in aqua regia, dilute the acid with clean water, add ammonia to neutralize it, and then gently inject nickel reagent. If there is red velvet floating on the liquid surface, that is, stainless steel contains nickel; If there is no red velvet material, that is to prove that stainless steel is nickel free.

If you have any questions, please contact us. Our company can produce various customized needles, medical needles, puncture needles, hypodermic needles, biopsy needles, vaccine needles, injection needles, syringe needles, veterinary needles, pencil point needle, ovum pick up needles, spinal needles, etc. If you need customized needle products, please contact us. We look forward to your inquiry! The quality of the products manufactured in our factory will surely satisfy you!

Please contact us if you need: zhang@sz-manners.com