Stainless steel polishing | impact on the structure and performance

1. The influence of mechanical polishing. For the mechanical polishing of austenitic nickel-chromium stainless steel, such as 1Cr18ni95Ti, only the abrasive is used to level the surface under a large directional pressure. Therefore, there is a certain plastic deformation structure characteristic on the surface-fibrous structure, namely the Bayer layer. carton steel seamless pipe weight tube

2. The influence of electrochemical polishing. Ma Shengli et al. studied the surface structure of 1Cr18ni95Ti stainless steel electrochemically polished in phosphoric acid/sulfuric acid system electrolyte from a typical fibrous structure to a uniform and dense granular grain structure. This is obviously related to the mechanism of the polishing process.

Usually when the current flows through the electrolyte, the stainless steel is on the anode, and the metal surface is preferentially dissolved, and the microscopic dissolution rate of different crystal faces in the crystal grains is different, which leads to the appearance of crystal grain edges. However, the surface microstructure morphology is very different under different electrochemical polishing conditions. For example, in a 65% (wt) water electrolyte, when the anode current density is 30A/dm2 and t is 70℃ for 15min, a better surface polishing effect can be obtained. When the anode current density (DA) is too low (DA<20A/dm2= or too large (DA<40A/dm2), or the temperature is too high (> 90℃) or too low (<50℃=), or the polishing time is too long Long (>25min) or too short (<10min) are not conducive to the improvement of surface polishing quality. astm a316 stainless steel pipe