Now the stainless steel pipe fittings also have a lot of products, in the face of such a situation we want to identify the true and false stainless steel fittings, and now you can use some chemical syrup to identify some of the characteristics of stainless steel, and thus to identify the stainless steel pipe fittings are also good or bad Methods as below:
1, we all know that stainless steel pipe has a strong magnetic, non-magnetic or weak magnetic some of the characteristics of stainless steel is non-magnetic steel, but after a large pressure cold processing will have a mild magnetic; pure chrome steel and low alloy steel has a strong Magnetic steel.
2, another significant feature of stainless steel is the most concentrated nitric acid and dilute nitric acid has a certain degree of corrosion resistance, can be very intuitive to distinguish between stainless steel and other metals.
3, sulfuric acid test sulfuric acid immersion test can 302 and 304 and 316 and 317 stainless steel pipe to distinguish. The trimming of the sample should be finely ground and then washed and passivated for half an hour in nitric acid at a concentration of 20 to 30% and at a temperature of 60 to 66 ° C.
4, in addition to the use of nitric acid can also be used to distinguish between ordinary copper carbon and all the ordinary stainless steel. As long as the concentration of 5 to 10% of the copper sulfate solution can clearly see the difference between the two, ordinary carbon steel in the copper sulfate solution will form a surface copper, and then the surface of stainless steel is not There are other reactions, of course, before doing this experiment to clean up the carbon steel, to remove grease or a variety of impurities, and polished with a soft grinding a small area.
Source: China Pipe Fittings Manufacturer – Yaang Pipe Industry Co., Limited (www.yaang.com)