How to identify the authenticity of stainless steel pipe fittings
When purchasing stainless steel pipe fittings, in the face of various brand manufacturers and models, everyone does not know how to choose qualified products. So we need to master the correct identification method. This article will introduce to you how to identify the authenticity, hoping to help you buy the products you are satisfied with.
1. Identification of color and luster
The surface color of the acid-washed stainless steel pipe fittings is silver-white and smooth: the color of chrome-nickel stainless steel is silver-white and jade-colored; the color of chrome-nickel stainless steel is slightly grayish and weak; the color of chrome-manganese-nitrogen stainless steel is similar to that of chrome-nickel stainless steel and slightly lighter. The surface color of unpickled stainless steel: chrome-nickel steel is brownish white, chrome steel is brown-black, and chrome-manganese nitrogen is black (these three colors refer to the color with heavier oxidation). Cold-rolled unannealed chrome-nickel stainless steel with silver-white reflective surface.
2. Identify with magnets
Magnets can basically distinguish two types of stainless steel. Because chromium stainless steel can be attracted by magnets in any state; chromium-nickel stainless steel is generally non-magnetic in the annealed state, and some will be magnetic after cold working. However, high manganese steel with higher manganese content is non-magnetic; the magnetic situation of chromium-nickel-nitrogen stainless steel is more complicated: some are non-magnetic, some are magnetic, and some are non-magnetic in vertical and magnetic in transverse. Therefore, although magnets can basically distinguish chromium stainless steel and chromium-nickel stainless steel, they cannot correctly distinguish some steel types with special properties, let alone specific steel grades.
3. Identify with copper sulfate
Remove the oxide layer on the steel, put a drop of water, wipe it with copper sulfate, if it does not change color after rubbing, it is generally stainless steel; alloy steel.
The above methods can help you to identify the quality of stainless steel pipe fittings in basic aspects. If you need more in-depth testing, you need to go to relevant institutions. When purchasing equipment, you must choose products produced by regular manufacturers, so that you can get quality assurance. .