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EA1N axle steel heat treatment technology
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An EA1N, axle steel technology, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of low production efficiency, high energy consumption, complex process steps, etc., and achieve high production efficiency, low energy consumption, and process steps. simple effect
Active Publication Date: 2018-04-20
ZHUZHOU TIANLI FORGING IND
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[0003] Chinese patent document CN104404224A discloses a heat treatment process method of an EA1N material urban rail axle, including two normalizing and one tempering steps, such as figure 1 As shown, the process takes at least 15 hours as a whole (including the time of heating up, isothermal normalizing and air cooling), the production efficiency is not high (at most about 3 furnaces can be produced in 2 days), the process steps are complicated and the energy consumption is quite large. Therefore, it is necessary to adjust the existing EA1N axle steel heat treatment process. Under the same furnace load conditions, it can reduce energy consumption and improve production efficiency under the condition of meeting the technical and quality requirements of EA1N axle steel.
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Embodiment 1
[0028] Such as Figure 2 to Figure 3 As shown, the EA1N axle steel heat treatment process of the present embodiment comprises the following steps,
[0029] (a) Furnace loading: Furnace the EA1N axle steel blank;
[0030] (b) Heating: heating the whole loaded axle shaft to 875°C at a heating rate of 250°C / h;
[0032] (d) Cooling: After the holding time is reached, the axle is taken out of the furnace and air-cooled.
[0033] The above heat treatment process is carried out in a 400kw trolley-type resistance furnace. The heat treatment process of this embodiment is simple, and only one normalizing operation is required, and the production efficiency reaches 2 to 3 furnace axles per day. The existing two normalizing and The production efficiency of the heat treatment process for one tempering is only 2 days and 3 furnaces. Compared with the production efficiency of the heat treatment process in...
Embodiment 2
[0038] The EA1N axle steel heat treatment process of the present embodiment comprises the following steps,
[0039] (a) Furnace loading: Furnace the EA1N axle steel blank;
[0040] (b) Heating: heating the whole loaded axle to 900°C at a rate of 450°C / h;
[0046] (h) Rework cooling: After the holding time is reached, the reworked axle is taken out of the furnace and fog-cooled.
[0047] The above-mentioned heat treatment process is carried out in a 400kw trolley-type resistance furnace. The heat treatment process flow of this embodiment is simple, and only one no...
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Abstract
The invention discloses an EA1N axle steel heat treatment technology. The EA1N axle steel heat treatment technology comprises the steps that an EA1N axle steel blank is fed into a furnace, then the whole EA1N axle steel blank is heated to 850-910 DEG C, the temperature is kept for 4-7 hours, and them the axle steel is discharged from the furnace and cooled. The EA1N axle steel heat treatment technology is simple in process, low in energy consumption, short in treatment time, high in production efficiency and considerable in economic benefit, and the produced axle meets the EN13261 standard andrelevant industrial standards.
Description
technical field [0001] The invention belongs to the field of manufacturing key components of high-end rail transit equipment, and in particular relates to a heat treatment process for EA1N axle steel. Background technique [0002] Domestic EA1N axles are mainly used in various B-type subways. Compared with axles made of other materials, they have the advantages of low cost and short manufacturing cycle. At present, domestically produced EA1N axles are treated with normalizing and tempering. The normalizing equipment for EA1N axles is a trolley-type or suspended high-power normalizing furnace. The longer the normalizing time, the greater the energy consumption. [0003] Chinese patent document CN104404224A discloses a heat treatment process method of an EA1N material urban rail axle, including two normalizing and one tempering steps, such as figure 1 As shown, the process takes at least 15 hours as a whole (including the time of heating, isothermal normalizing and air cooli...
Claims
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