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shrinkage cavity
Introduction
In civil engineering, holes are often caused by the process of shrinkage. Shrinkage can occur in both concrete and soil materials, resulting in a variety of different types of holes. Shrinkage holes can lead to structural problems, such as decreased stability and increased stress, as......
1223 
Sophia
Belt Grinding
Sand Belt Grinding
Sand belt grinding is a type of grinding technology used to finish materials. The process utilizes a flexible abrasive belt that is coated with an abrasive to grind and polish a surface along with a belt grinder. The belt grinder is typically stationary, while the abrasive belt......
heat treatment of metals in ancient China
Heat Treatment of Metals in Ancient China
The history of heat treatment of metals in China dates back to the Shang Dynasty (1600-1046 BCE). This early heat treatment was used to soften and harden bronze utensils and weapons such as knives and spearheads, by heating and cooling in a process that i......
Working principle of RH vacuum degassing method and DH vacuum degassing method
Vacuum deaeration Methods- RH and DH Vacuum
Deaeration
Vacuum deaeration is a method used to remove dissolved gases from water or other solutions. There are two main types of vacuum deaeration: RH (recirculation and headspace) and DH (direct headspace) vacuum deaeration. These methods can be use......
Rolling bearings commonly used in machine tool spindles and their characteristics
Introduction
Roller bearings are a type of cylindrical bearing that use rolling elements to support heavy radial and axial loads. Roller bearings have a long history of use in numerous industries as a result of their durability and ability to support large loads. Roller bearings are used in many ......
Gating system
Sprinkler System
A sprinkler system is a system of automated sprinklers that are connected to an automated control system and are used to water landscaped areas in an efficient and controlled manner. This system consists of several components which includes the water supply, sprinkler heads, a tim......
Gray iron castings (abstract) GB 9439-88
Abstract
GB 9439-88 is a national standard for gray cast iron parts. Gray cast iron is a type of cast iron which has an even surface and a dense microstructure with excellent mechanical properties and wear resistance. This standard specifies the requirements, test methods, acceptance criteria, ma......
Gray cast iron (GB/T9439-1988)
Gray casting iron (GB/T9439-1988)
Gray cast iron, commonly known as cast iron, is a metal alloy consisting predominantly of iron with carbon and silicon as the main alloying elements. Gray cast iron has a comparatively high strength and wear resistance, and is used in a wide variety of applicatio......
20CrMo, 30CrMo use
20CrMo and 30CrMo are two medium carbon alloy structural steels often used for manufacturing auto parts and components. The steel contains high levels of chromium and molybdenum for improved strength and durability characteristics. 20CrMo alloy steel is often used for significant components such a......
20CrMnSi use
20CrMnSi
20CrMnSi is a low alloy steel made up of 20% chrome, 11.2% manganese, and 1.4% silicon. It is primarily used for a variety of applications involving the automotive and aircraft industries. This steel is heat treatable and resistant to corrosion and abrasion which make it a popular choice......
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