Aluminum alloy die-casting die, die erosion (also known as cracking) was found at the beginning of production. Want to know the reason why hot work die steel is eroded and how to prevent it?

1、熱作模具鋼廠家解析熱作模具鋼被沖蝕的原因：

1. The hot work die steel manufacturer analyzes the reasons for the erosion of hot work die steel:

壓鑄模具作業過程中，熱作模具鋼不斷地接受高速、高壓噴發、金屬的沖刷腐蝕和加熱效果。因而熱作模具鋼，有必要具有杰出的抗熱疲憊性、紅硬性和抗高溫液態金屬的沖刷、腐蝕功能，而且應具有較好的工藝功能。熱作模具鋼被沖蝕的原因其實是，模具鋼含有低熔點的雜質和非金屬雜質。這些纖細分布于模具型腔的低熔點雜質，無法抵擋高壓噴發金屬的沖刷腐蝕和加熱效果，而被熔化后掉落，在模具外表構成腐蝕麻點或纖細裂紋，構成沖腐蝕(又稱：龜裂)。這些龜裂點漸漸展開，就會構成壓鑄模具開裂報廢，縮短模具使用壽命。

In the process of heating and high-pressure die-casting, the metal will be continuously eroded during high-pressure die-casting. Therefore, it is necessary for hot working die steel to have excellent thermal fatigue resistance, red hardness, erosion and corrosion resistance of high-temperature liquid metal, and should have better process function. The reason why hot work die steel is eroded is that die steel contains impurities with low melting point and non-metallic impurities. These fine low melting point impurities distributed in the mold cavity can not resist the scouring corrosion and heating effect of high-pressure eruption metal, but fall after melting, forming corrosion pits or fine cracks on the surface of the mold, forming scouring corrosion (also known as cracking). These cracking points gradually expand, which will constitute the cracking and scrapping of die-casting die and shorten the service life of die.

2、熱作模具鋼被沖蝕的辦法

2. Solution to erosion of hot work die steel

防止熱作模具鋼被沖蝕的有用辦法是前進模具鋼純凈度，下降或低熔點雜質。為了前進熱作模具鋼的使用壽命，往往挑選純凈度高、等向性好，通過爐外精煉，電渣重熔、多向鑄造的高質量模具鋼。同行為了下降本錢，選用廢鋼翻新替代合金煉鋼,削減煉鋼工藝，下降模具鋼出產本錢。這些偷工減料、以次充好、的模具鋼雜質多。而且雜質一旦存在就無法去除，只能稀釋。但這些存在于模具鋼內部的雜質，會引起熱作模具鋼被沖蝕。造成鋁合金壓鑄模具在3000模次左右龜裂，模具2-3萬模次開裂報廢。

A useful way to prevent hot work die steel from being eroded is to advance the purity of die steel and reduce or solve the impurities with low melting point. In order to advance the service life of hot working die steel, high-quality die steel with high purity and good isotropy is often selected through out of furnace refining, electroslag remelting and multidirectional casting. In order to reduce the cost, peers choose scrap steel renovation to replace alloy steelmaking, reduce steelmaking process and reduce the production cost of die steel. These shoddy work and materials, shoddy mold steel and many impurities. Moreover, once impurities exist, they cannot be removed and can only be diluted. However, these impurities in the die steel will cause the hot work die steel to be eroded. The aluminum alloy die-casting die is cracked about 3000 times, and the die is cracked and scrapped for 20000-30000 times.

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