Compound microalloy hot die steel with high heat resistance and preparation method thereof

Abstract

The invention relates to a compound microalloy hot die steel material with high heat resistance and a preparation method thereof, belonging to the technical field of the manufacture process of die steel. The invention is characterized by comprising the following components by weight percent: 0.25% to 0.4% of C, 1.0% to 1.8% of Si, 0.01% to 0.3% of Mn, 3.5% to 5.0% of Cr, 2.0% to 3.5% of Mo, 0.8% to 1.5% of V, 0.03% to 0.07% of Nb, 0.05% to 0.1% of rare earth element (Ce+La), less than 0.02% of P, less than 0.02% of S and the balance of Fe. The preparation method of the hot die steel comprises the process of: (1) adding rare earth after melting; (2) remelting electroslag; (3) homogenizing at high temperature; (4) forging and dissolving solid; (5) spheroidizing annealing; and (6) heating to finally prepare the hot die steel. The hot die steel has the advantages of high purity, high heat resistance, good heat stability and excellent heat fatigability.

Description

technical field [0001] The invention relates to a composite microalloyed high heat strength hot work die steel and a preparation method thereof, belonging to the technical field of die steel manufacturing technology. Background technique [0002] Among the many failure factors of the mold, the failure caused by the quality of the mold material and the improper manufacturing process of the mold account for about 70%. It can be seen that the mold material is one of the important factors that determine the quality of the mold. With the development of the mold industry to the high-end level, it is bound to put forward higher and stricter requirements on the performance (strength and toughness) of the mold or mold material. [0003] The quality of domestic alloy die steel is low, and the comprehensive performance level of hot work die steel is not high. For example, although the thermal strength of 3Cr2W8V steel is high, its toughness is insufficient, and fractures occur from ti...

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Problems solved by technology

[0003] The quality of domestic alloy die steel is low, and the comprehensive performance level of hot work die steel is not high

For example, although the thermal strength of 3Cr2W8V steel is high, the toughness is insufficient, and the fracture occurs from time to time when the mold is used.

4Cr5MoSiV1 steel (equivalent to American H13 steel) has good toughness, but its thermal strength is not ideal, and the mold cavity is easy to collapse or deform when the mold is used

[0005] Similarly, the application of niobium as a microalloying element added to tool steel is rarely reported

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