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Characteristics of Stainless Steel Forgings and Classification of Forged Bodies
Release time:
2024-11-27
Many people are not very familiar with the formation of stainless steel forgings. Today, I will briefly describe the formation of stainless steel forgings and the various classifications of stainless steel forgings.
Many people are not very familiar with the formation of stainless steel forgings. Today, I will briefly describe the formation of stainless steel forgings and the classification of stainless steel forgings.
Stainless steel forgings refer to objects made from stainless steel material that are shaped by applying pressure, where the forging factory shapes the required form or suitable compression force through plastic deformation. This force is typically achieved through the use of hammers or presses. Forging can eliminate defects such as looseness that occur in the casting state during the smelting process, optimize the microstructure, and because it retains the complete metal flow lines, the mechanical properties of stainless steel forgings are generally superior to castings of the same material. For critical components in machinery that bear high loads and operate under harsh conditions, forgings are often used, except for larger shapes that can be made from rolled plates, profiles, or welded parts.
Classification of stainless steel forging methods:
1. According to the movement method of the blank, forging can be divided into free forging, upsetting, extrusion, die forging, closed die forging, and closed upsetting.
① Free forging. The forging factory uses impact force or pressure to deform the metal between two anvils (anvil blocks) to obtain the required forging, mainly including manual forging and mechanical forging.
② Die forging. Die forging is further divided into open die forging and closed die forging. The metal blank is deformed under pressure in a die cavity with a certain shape to obtain the forging, which can also be divided into cold heading, roll forging, radial forging, and extrusion, etc.
2. According to the deformation temperature, forging can also be divided into hot forging (forging temperature above the recrystallization temperature of the blank metal), warm forging (forging temperature below the recrystallization temperature of the metal), and cold forging (at room temperature). The recrystallization temperature of the steel in the forging factory is about 460°C, but 800°C is commonly used as the dividing line; temperatures above 800°C are considered hot forging; temperatures between 300°C and 800°C are referred to as warm forging or semi-hot forging.
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