Hot die steel for die-casting

Abstract

The invention provides a hot work die steel used for die-casting, which is obtained through temper under the temperature that is less than or equals to 500 DEG C after the following steels are quenched. The steels contain the components by mass percent as follows: C is 0.1 to 0.3 percent, Si is 0.1 to 1.5 percent, Mn is 0.3 to 2 percent, Cr is 6 to 12 percent, P is less than or equals to 0.05 percent, S is less than or equals to 0.01 percent, Mo is 1 to 3 percent, V is 0.5 to 1.5 percent, s-Al is 0.005 to 0.025 percent, N is 0.005 to 0.025 percent, O is less than or equals to 0.005 percent, and the residual components are Fe and ineluctable impurities.

Description

technical field [0001] The present invention relates to hot work die steel used in die-casting molds, in particular, to such a hot work die steel for die-casting, which can suppress the main cause of large cracks in die-casting dies, that is, cracks starting from water cooling holes, so as to cope with die-casting High recycling of product manufacturing. The die-casting hot work die steel of the present invention is particularly suitable for use as a material for aluminum die-casting dies. Background technique [0002] As an aluminum die-casting die, there has been a problem that cracks (hot cracks) are generated on the surface of the cavity due to thermal fatigue. This thermal cracking refers to the following phenomenon: when cooling water is poured on the surface of the cavity after the mold is opened, tensile stress is generated on the surface of the cavity due to the temperature difference between the rapid cooling of the surface of the cavity and the inside of the heat...

AI Technical Summary

Problems solved by technology

In this case, the following problems arise: the thermal stress generated on the surface of the water-cooling hole increases when the aluminum product is cast, and cracks occur from the water-cooling hole.

[0017] In the technique disclosed in reference 1, no matter which method is used, local heating must be performed, and there is a problem that the shape of the water-cooling hole is limited. For example, the diameter of the water-cooling hole must be a size that the burner can enter.

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