Hot mold steel for long life cycle die casting having high thermal conductivity and method for preparing the same

Abstract

The invention relates to hot mold steel for long life cycle die casting having high thermal conductivity and method for preparing the same. IN particular, the invention relates to the hot mold steel having excellent thermal conductivity and durability and used for production of automobile parts. According to an embodiment, the described hot mold steel may be excellent in high thermal conductivityto decrease the temperature difference in materials at high temperature, thereby making heat-checking properties excellent. When the hot mold steel according to the present disclosure is used for diecasting, the cooling rate of the product produced using the die casting is quick, thereby improving the physical properties of the produced product and shortening the cooling time to improve productivity. Furthermore, the hot mold steel may have excellent high temperature durability, such that the die casting produced using the hot mold steel may have characteristics of a long life cycle.

Description

technical field [0001] The present invention relates to a hot die steel for long-life die-casting with excellent high-temperature thermal conductivity and a method for producing the same, and more particularly, to high-temperature thermal conductivity and a A hot die steel with excellent durability and its manufacturing method. Background technique [0002] Hot die steels are alloy die steels that contain, in addition to iron, especially carbon, chromium, tungsten, silicon, nickel, molybdenum, manganese, vanadium and cobalt as alloying elements in varying amounts. In particular, when performing die casting, extrusion or die forging, the material can be shaped using hot die steel to produce a suitable hot die steel object. As examples of such dies, extrusion dies, forging dies, die-casting dies, stamping dies or dies similar thereto require special mechanical strength properties at high processing temperatures. [0003] An important function of tool steels, especially hot t...

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Problems solved by technology

[0006] On the other hand, STD61, which is used as a die steel for hot forming, has a low thermal conductivity of less than 28W / mK. Due to the low thermal conductivity, in high temperature work, the expansion rate is poor due to the temperature difference of the material part, and the frequency of thermal cracks occurs. High, leading to a reduction in the life of the mold, and, because the cooling rate of the produced product cannot be sufficiently increased, there is a problem that the quality of the hot stamping product that requires a high cooling rate is reduced and the productivity is reduced.

In addition, since it is a chromium carbide with a low hardness in a precipitate that maintains wear resistance at high temperatures, there is a problem that the wear resistance is low in a high temperature environment.

[0007] Recently, with the trend of environmental protection and fuel saving in the automobile industry, the use of lightweight non-ferrous metals is increasing in order to achieve weight reduction, and the demand for die-casting die steel for molding this is also increasing. However, die-casting steel used in Korea The hot die steel market is occupied by overseas advanced companies such as Hitachi, and the price is high, but, in the manufacture of long-life die-casting, the level does not meet the thermal conductivity or durability of die steel, etc.

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