2022-09-09
Stainless steel precision tube is generally used for precision instruments or medical devices, not only the price is relatively high, and usually used in key equipment and instruments, so the material and precision requirements of precision stainless steel tube and surface finish requirements are very high.
Usually the civilian precision stainless steel tubes are 301 stainless steel, 304 stainless steel, 316 stainless steel, 316L stainless steel, 310S stainless steel. Our factory generally produces NI8 material, that is, more than 304 material, our factory does not produce low material precision stainless steel tube customary, will be called 201, 202 stainless steel, because it is magnetic, the magnet has a suction. 301 also non-magnetic, but in the cold processing with magnetic, the magnet has a suction. 304, 316 non-magnetic, no suction to the magnet, not sticky magnet.
The main reason for magnetic or not is that the stainless steel material contains chromium, nickel and other elements of different composition ratios and different metallographic structures. Combined with the above characteristics, the use of magnets to determine the quality of stainless steel is not a viable method, but this method is not scientific, because the production process of stainless steel, there are cold drawn, hot drawn, better post-processing, then magnetic less or no, bad, then magnetic larger, reflecting the purity of stainless steel. Users can also be judged from the packaging of precision stainless steel tubes, appearance: rough, uniform thickness, whether the surface is stained dots and other aspects.