The characteristics and heat treat process of precision steel tube

Because of the precision steel tubeĀ inside and outside wall without oxidation layer, under high pressure without leakage, high precision, high finish, cold bending deformation, flaring, flattening without cracks etc, it is mainly used to produce pneumatic or hydraulic components products, such as a cylinder or cylinder, can be a seamless steel pipe, welded pipe.Vacuum annealing of high quality spring steel, tool steel, precision steel wire, stainless steel and titanium alloy material, make bright annealing treated by vacuum.The lower annealing Efficiency Heating
Coolingtemperature is, insist on the higher the degree of vacuum.In order to prevent the evaporation of chromium and accelerate the heat conduction, generally USES the carrier heating method (insulation), and pay attention to stainless steel and titanium alloy is unfavorable use nitrogen and argon gas should be adopted.


Vacuum quenching vacuum quenching furnace according to the cooling method is divided into two types of oil quenching and quenching, according to the location number can be divided into single room and double room, 904 mountain feared chao cycle type furnace.Vacuum oil quenching furnace are double room, room after electric heating element, tank down to the bottom of the front room.Artifacts after heating, heat preservation before moving room, closed the door after forward chamber inert gas, into the oil.Oil quenching easy cause surface deterioration.In short, because of the large surface activity under the action of high temperature and oil film can markedly thin-layer carburizing, in addition, carbon black and oil on the surface adhesion to simplify the heat treatment process is very adverse.Vacuum quenching technology development is the main of the development of high performance, the single gas cooling quenching furnace.The double chamber furnace can also be used for gas quenching (in the front room jet cooling), but the operation of the double location type difficult in the mass production of furnace, is also in the workpiece deformation caused by the high temperature moving or changing artifacts bearing quenching distortion increase.In a single location – cooling quenching furnace is after completion of the heat preservation in heating indoor jet cooling.Oil is better than cold air cooled cold speed is fast, and lower than the traditional quenching method of molten salt, isothermal, graded and quenching.Therefore, continuously improve spray cold chamber pressure, increase traffic, and the molecular weight smaller than nitrogen and argon, inert gas helium and hydrogen is the mainstream of the