Cold working die steel material and production technology thereof

Abstract

The invention provides a cold-working die steel material, which comprises the following trace elements in percentage by weight: 0.95 to 1.05 percent of C, 0.35 to 0.45 percent of Mn, 0.55 to 0.65 percent of Si, 7.55 to 8.5 percent of Cr, 0.45 to 0.55 percent of Mo, 0.35 to 0.45 percent of V, less than or equal to 0.025 percent of S, and less than or equal to 0.025 percent of P. The cold-working die steel material has simple technical process and easily-controlled operation, adopts alloying and modification treatment, has good hardenability, stable temper resistance, higher wear resistance and good processability, can improve work efficiency, reduce production cost, reduce or avoid moulds from breaking and cracking, and has long service life, high performance-price ratio and wide application.

Description

technical field [0001] The invention belongs to the technical field of metal materials and processing, in particular to the scope of mold manufacturing and use, and relates to cold-worked mold steel and a manufacturing method thereof. Background technique [0002] Since the middle of the 20th century, since the world's technologically powerful countries used high-alloy steel to make molds, the manufacturing technology of mold steel has been continuously developed, and the excellent properties of high-alloy steel have been recognized by the society, but there are also problems in the use and manufacturing process. It is troubled by people, such as collapse and brittleness, difficulty in cold working, serious cracking tendency in heat treatment, small and difficult forging interval, easy aggregation of carbides into lumps, serious soft spot problems, etc. In the process of mold manufacturing and use, reducing manufacturing difficulty, improving work efficiency, reducing produc...

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Problems solved by technology

[0003] In the past, people often used Cr12 and Cr12MoV as the first choice for cold work die steel, especially Cr12 is a high-carbon high alloy. Although it has high strength and hardness after heat treatment, its cracking phenomenon is more serious, which is the main reason for mold failure.

In addition, the forging process range of Cr12 is relatively narrow, and the carbides are not easily broken or distributed in blocks, which is easy to cause stress concentration, so that the mold is damaged by non-human factors, thus forming Cr12. The original price is not high, but the manufacturing and use costs are not high. low set

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