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Shenyang gold Mold Steel Co., Ltd.


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Hot forging die steel requires high tempering stability and high thermal fatigue resistance

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Hot forging die steel requires high tempering stability and high thermal fatigue resistance

Release date:2016-06-15 00:00 source:http://www.zjmjg.com Click:

 

Hot forging die steel hot-work die steel including hammer forging die, hot extrusion mould and die-casting mould. As mentioned above. The main characteristic of hot-work die working conditions is with hot metal contact, this is the main difference between cold work die working conditions. Thus leads to the following two problems: (l) the cavity surface of the metal is heated. Usually work when the hammer forging die. The cavity surface temperature can reach more than 300 ~ 400 ℃ hot extrusion die can reach more than 500 a 800 ℃; Die mold cavity temperature associated with die casting material type and pouring temperature. Such as black metal die-casting mold cavity temperature can reach more than 1000 ℃. The use of such a high temperature can make the cavity surface hardness and strength significantly reduced, in use of zhongyi crib. To do this. The basic use of performance requirements of hot die steel is thermal plastic deformation resistance is high, including high temperature hardness and high temperature strength, high thermal plastic deformation resistance, actually reflects the high tempering stability of steel. Thus can find the first way to hot die steel alloying, namely to join, Si, Cr, W., such as alloy elements can improve the tempering stability of steel. (2) the cavity surface of the metal thermal fatigue (chap). The working characteristics of hot die is intermittent. Every time after the hot metal forming to the media such as water, oil, air cooling the surface of the cavity. So. The working state of hot die is repeated heating and cooling, so that the cavity surface metal produce repeated heat bilges cold shrink, repeated under tension and compression stress. The results cause cavity surface crack, known as thermal fatigue phenomenon, as a result, the second basic use are put forward for hot die steel performance requirements. Which has high thermal fatigue resistance. Generally speaking, are the major factors affecting the thermal fatigue resistance of steel: the thermal conductivity of steel. High thermal conductivity of steel, can make the mould surface metal heat degree is reduced, so as to reduce the thermal fatigue of steel. The steel thermal conductivity were considered related to carbon content, carbon content is high thermal conductivity is low, so steel are unfavorable use high carbon steel. Usually used in production of medium carbon steel (C0.3%5 ~ 0.6%) and low carbon. To cause a decline in hardness and strength of the steel. Also is adverse. (2) the critical point of steel. Usually the critical point of steel (Acl) is higher. The lower the thermal fatigue of steel tendentiousness. So. Usually by adding alloying elements Cr, W, Si, the critical point of steel. So as to improve the thermal fatigue resistance of steel. 






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