ASTM A276 316 Stainless 125*125 Steel Angle bars | Care and maintenance
1. Color distinction
ASTM A276 316 Stainless 125*125 Steel Angle bars passivated by pickling, the surface color is snow white and bright: the color of chromium nickel stainless steel is snow white and light green; the transparency of chromium stainless steel is slightly gray and the gloss is weak; the color of chromium manganese nitrogen stainless steel is similar to that of chromium nickel stainless steel Similar and slightly lighter. The surface color of stainless steel that has not been pickled and passivated: chromium-nickel steel is brown and white, manganese steel is dark brown, and chromium-manganese nitrogen is black (these three colors refer to the colors with heavy oxidation). Hot-rolled chromium-nickel stainless steel without quenching has a snow-white surface with reflective surface.
2. Use magnets to distinguish
Magnets can be divided into two major categories of stainless steel. Because chromium stainless steel can be attracted by magnets under all circumstances; chromium-nickel stainless steel is generally non-magnetic when quenched, and some will become magnetic after cold drawing. However, medium carbon steel with higher magnesium content is non-magnetic; the magnetic situation of chromium-nickel-nitrogen stainless steel is more confusing: some are non-magnetic, some are magnetic, and some are non-magnetic in the longitudinal direction and magnetic in the transverse surface. Therefore, although magnets can fundamentally distinguish chromium ASTM A276 316 Stainless 125*125 Steel Angle bars and chromium-nickel stainless steel, they cannot properly distinguish some steel grades with special characteristics, let alone actual steel models.
3. Distinguish with sodium thiosulfate
Remove the oxidation layer on ASTM A276 316 Stainless 125*125 Steel Angle bars, put a drop of water on it, and rub it with sodium thiosulfate. If it does not fade after rubbing, it is usually stainless steel; if it turns purple-red, it is non-magnetic. Carbon steel, magnetic steel is generally general steel or high alloy steel. Regarding steel grades with special characteristics, we still need to use the following three methods to distinguish them.
4. Distinguish
The difference is to grind the stainless steel on a grinder and watch the sparks. If the sparks are streamlined and have more dense knots, it is medium carbon steel or manganese nitrogen steel with higher magnesium content; if there are no knots, it is manganese steel or chromium-nickel stainless steel.
