Questions about the choice of sandpaper

The choice of metallographic sandpaper does not matter much, no matter the material is soft or hard, it must go through the process of rough grinding, fine grinding, polishing and corrosion. Generally, 100# 200# 400# 600# 800# 1000# can be selected. If one or two kinds are missing in the middle, it does not matter. The spring steel is relatively hard, and it should be better to grind the metallographic phase, because the softer the material, the easier it is to form. scratches. Sandpaper is composed of dry sandpaper and water sandpaper. We generally choose water sandpaper, but you can choose according to your own situation. The brand of sandpaper is very important. When choosing, look at the thickness of the sandpaper, it must not be too thin, and the firmness of the sand and whether the distribution is even.
First of all, the sandpaper is divided into dry sandpaper and water sandpaper. Metallographic sandpaper is dry sandpaper, which is used for polishing; and water sandpaper is polished under the washing of water, which is generally used on a polisher. The abrasive grain of metallographic sandpaper is a mixture of particles of natural corundum alumina and iron oxide, and the sandpaper is gray-green.
Generally, steel materials can be finely ground with five grit sizes of 280, 320, 400, 500, and 600 sandpaper.