From the appearance, stainless steel bolts have a high smoothness/brightness, and the color is not as bright as galvanized bolts.
Author: Marisa
1、 From the appearance, stainless steel bolts have a high smoothness/brightness, and the color is not as bright as galvanized bolts.
2、 The methods for distinguishing galvanized bolts from stainless steel bolts are:
① You can use a magnet to approach the bolt. If there is no magnetic force, it is a stainless steel bolt, and if there is magnetic force, it is a galvanized bolt.
② Divide by color
Stainless steel bolts are the primary color of iron and are made of stainless steel material. The color of stainless steel is mainly an alloy of iron and carbon, so the color is close to the original color of iron. The surface of galvanized bolts is galvanized with white zinc, colored zinc, black zinc, etc. Therefore, the colors of galvanized screws are generally white, colored, and black. Among them, white is the most common.
3、 Usage
Galvanized bolts are generally used in ordinary dry environments, while the equipment used for stainless steel bolts is often exposed to humid environments for a long time, often washed with water, often rained on, and exposed to the outdoors for a long time. If galvanized bolts are used in this environment, rust often occurs within six months.
Galvanized bolts are generally not allowed to be used in some physical occasions, such as inside transformers, because the galvanized layer on the surface of the bolt will undergo chemical changes when soaked in transformer oil for a long time. On the one hand, it will produce metal ions, affecting insulation, and on the other hand, it will lead to oil degradation. When used to tighten copper bars with high current flow, copper bolts or stainless steel bolts can be used to avoid local overheating of the bolts.
Relatively speaking, the cost of stainless steel bolts is higher than that of galvanized bolts.
4. Stainless steel/galvanized fasteners are used in light and heavy industries such as petroleum, chemical, construction, bridges, textile printing and dyeing, mechanical hardware, medical, decoration, shipbuilding, etc.