Jiawang bearing steel bar, rolling bearing steel bar GCr9 Jiawang bearing steel

包装：

标准

规格：

齐全

用途：

广泛

Japanese standard high-carbon chromium bearing steel corresponds to the national standard brand high-carbon chromium bearing steel. It can be fully hardened to a hardness of up to 100%. It has the wear resistance of the bearing and also strengthens the steel. It has good processability and can be directly processed into shape. The use mold number is higher than (r) Full hardware - times. There is little dimensional change during quenching and tempering. The fatigue resistance is quite good. Introduction
The overall performance is good. After quenching and tempering, the hardness is high, the wear resistance is uniform, and the contact fatigue strength is high. Good hot processability. Good processability after spheroidization annealing but sensitive to the formation of white spots.
Application
Used for cold rolling of general plastic molds, automotive machine tool bearings, steel ball roller bushings
Manufacturing internal combustion engines. Steel balls, rollers and bushings on transmission shafts of electric locomotives, machine tools, tractors, steel rolling equipment, drilling machines, railway vehicles and mining machinery.
Chemical composition
Chemical composition (%):
:
:
:
:
:
:
Mechanical properties
Tensile strength:
Impact energy:
Hardness: ~
Sample size: a certain sample
Density: ./
Related information< br/> Heat treatment specifications: ~℃ quenching, oil cooling, °C tempering.
Metallographic structure: tempered martensite.
Delivery status
Hot rolled (forged) annealed non-annealed annealed and peeled steel, cold drawn (rolled) round steel and polished round steel, hot rolled steel pipe annealed and peeled steel pipe, cold drawn (rolled) steel pipe Delivery in eight states
Production process
The ladle degassing method has been applied since 2008, that is, the ladle is placed in a vacuum chamber and inert gas is passed through it for stirring so that the pressure drops to . (. Torr) to achieve degassing and make the steel The oxygen content in the medium decreases from (~)- to (~)-. The disadvantage of this method is that it is difficult to maximize the purity of the steel by mixing the highly alkaline slag. In order to solve this problem, the lifting degassing method (r method) was introduced in 2008. Under the high vacuum of . The use of high-power electric furnaces coupled with r degassing reduces the oxygen content in steel from (~)- to (.~)-. After 2000, in order to cooperate with the rational use of ultra-high-power electric furnaces, ladle refining technology (method) was introduced. That is, the ladle is equipped with heating, stirring and vacuum degassing devices to complete the reduction period in the ladle to form reducing slag and deoxidize, desulfurize, and dehydrogenate. Control the temperature of the molten steel, the composition accuracy of the molten steel and the pouring time. At this stage, the furnace should be used in combination with the ++r method to reduce the oxygen content in the steel to (~) - which is essential to match the continuous pouring. In addition, in order to further improve the effect of vacuum degassing, atomized vacuum degassing methods and cyclic vacuum degassing methods (commonly known as D methods) have been developed and adopted to produce vacuum degassed bearing steel.
Smelting method
During vacuum induction smelting, scrap steel that is basically free of impurities and has a chemical composition equivalent to that of the smelted alloy steel is selected and fed into a small electric induction furnace. This furnace is placed in a large vacuum chamber. The vacuum chamber includes a Seal the hopper to add the desired alloy. Degassing of the molten steel begins as early as during rapid melting and refining. After smelting is completed, the furnace is tilted and the molten steel is poured into the steel mold. The steel casting mold automatically enters and exits the pouring position in the vacuum sealed chamber. This vacuum induction smelting furnace process is one of the earliest vacuum smelting methods used to manufacture high-quality aviation bearing steel. One of its main roles today is to provide electrodes for the production of ultra-high purity vacuum arc remelted steel.
In this process, an electrode with an ideal chemical composition is placed in a copper mold that is cooled by water and has a vacuum inside. The arc is generated between the bottom surface of the electrode and the substrate of the same alloy composition. When the electrode wears out under extremely high vacuum it automatically drops and the voltage is controlled to maintain constant smelting parameters. Because the solidification method is controlled, remelted steel basically has no central pores and pouring key segregation. The remelted steel improves the mechanical properties especially in the transverse direction.