The recrystallization temperature of steel is about 460 ℃, but 800 ℃ is generally used as the dividing line, and hot forging is higher than 800 ℃; The temperature between 300 ℃ and 800 ℃ is called warm forging or semi hot forging. Forging can be divided into cold forging and hot forging according to the temperature of the blank during processing.
In forging production, in addition to ensuring the required shape and size of forgings, it must also meet the performance requirements of forgings in the process of use, which mainly include: strength index, plasticity index, impact toughness, fatigue strength, initial fracture and stress corrosion resistance. For parts working at high temperature, there are also high-temperature instantaneous tensile properties, durability and thermal fatigue properties.
Dalian forgings are widely used in building materials industry. Conceptually, a forging is a metal that exerts pressure to create a desired shape or appropriate compression through plastic deformation.
2. find out the quality problems, mainly to find out the causes, find out the defect parts and macro characteristics of forgings, and preliminarily judge whether the defects are caused by raw materials or forging process.
Before the use of the hydraulic cylinder, the stainless steel piston rod and piston must be connected. During the use, due to some reasons, the stainless steel piston rod and piston may become loose.
Piston rod is often used in almost all mechanical equipment, so we must pay attention to its installation. Otherwise, if the installation is incorrect, the equipment may not operate normally. In order to effectively improve the assembly quality of the equipment for better work.