Screw grease selection
author: Ann
2024-09-11
The most common machine parts are screws, and the correct selection of the most suitable screw grease is based on the material or surface of the screw, the thread and the conditions of use.
Therefore, in high-temperature working conditions, special high-temperature resistant lubricating pastes are used to lubricate screw connections. These greases contain base oils mixed with different solid lubricants and other additives. In the formulation or selection of the lubricant, care must be taken to ensure that the lubricant is free of sulfur, zinc, lead and aluminum, otherwise damage to the screws may occur. For example, stress-cracking corrosion can occur at high temperatures.
High-temperature-resistant screws are usually made of austenitic materials with alloying components such as nickel and molybdenum, which can only form a very thin oxide layer on the threaded surfaces, resulting in a high coefficient of friction and also easy bonding. By developing a pressure-resistant separator film, modern high-temperature greases can prevent this problem, reduce the coefficient of friction to the desired value and prevent the entry of oxidizing gases. In addition to these properties, some lubricants must be suitable for low-temperature service, which has a special formulation to prevent coefficient of friction corrosion and other surprises. The greases and pastes used contain white solid lubricants made of metal hydroxides, phosphates and sulfides.
Therefore, in high-temperature working conditions, special high-temperature resistant lubricating pastes are used to lubricate screw connections. These greases contain base oils mixed with different solid lubricants and other additives. In the formulation or selection of the lubricant, care must be taken to ensure that the lubricant is free of sulfur, zinc, lead and aluminum, otherwise damage to the screws may occur. For example, stress-cracking corrosion can occur at high temperatures.
High-temperature-resistant screws are usually made of austenitic materials with alloying components such as nickel and molybdenum, which can only form a very thin oxide layer on the threaded surfaces, resulting in a high coefficient of friction and also easy bonding. By developing a pressure-resistant separator film, modern high-temperature greases can prevent this problem, reduce the coefficient of friction to the desired value and prevent the entry of oxidizing gases. In addition to these properties, some lubricants must be suitable for low-temperature service, which has a special formulation to prevent coefficient of friction corrosion and other surprises. The greases and pastes used contain white solid lubricants made of metal hydroxides, phosphates and sulfides.
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