Quenching furnace manufacturer, large-scale roller bottom furnace manufacturer, 475 ℃ embrittlement specifically refers to the phenomenon of increased hardness and embrittlement of fat grain iron-based stainless steel with Cr content exceeding 13% when subjected to tempering treatment between 400 ℃ and 550 ℃, which is particularly significant at around 475 ℃. Brittleness at temperatures ranging from 400 ℃ to 550 ℃ is commonly observed in alloy steels used for construction. Brittleness at 270 ℃~350 ℃, also known as low-temperature tempering quenching, mostly occurs in carbon steel and low-alloy steel. Tempering and quenching type.
The so-called tempering quenching brittleness refers to the brittleness that occurs during quenching at a self tempering temperature of 00 ℃~600 ℃, which is quite significant in Ni Cr steel. Tempering quenching brittleness can be prevented by rapid cooling at the self tempering temperature. According to various experimental results, alloy steels used in mechanical structures can be air-cooled at a cooling rate of 10 ℃/min or above to prevent tempering quenching brittleness. The so-called 300 ℃ brittleness refers to the precipitation of carbides at the boundaries of crystal grains due to the decomposition of residual austenite during tempering treatment of some steels at around 270 ℃ to 300 ℃, resulting in tempering brittleness. Tempering brittleness can be divided into two types: 300 ℃ brittleness and tempering quenching brittleness. Tempering induced embrittlement.
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Henan wholesale quenching furnace manufacturer, a large-scale roller bottom furnace manufacturer, in order to shorten the cooling process time, the furnace top can be equipped with an exhaust device to accelerate cooling. When cooled to a certain temperature, the opening and closing operations are completed by operators on one side of the furnace through manual or automatic control. And optional inclined unloading mechanism for the trolley. The operation uses buttons and light display to control the on/off of heating elements and the lifting and lowering of the furnace door of the trolley, and is equipped with a chain device. When the furnace door is raised or closed to a certain position, the trolley can move safely.
The well type tempering resistance furnace is a periodic heat treatment equipment with a hot air circulation system, operating at a temperature of 650 ℃. It is mainly used for high-temperature tempering and annealing of various metal materials and is an ideal equipment for processing small shaft components. When used in conjunction with a control system, it can automatically control the heating temperature of the equipment. Application: Full fiber well tempering.