Hot-working die steel plate and preparation method thereof

Abstract

The invention relates to a hot-working die steel plate. The steel plate is composed of, by mass, 0.45-0.55% of C, 0.20-0.80% of Si, 0.50-0.80% of Mn, 3.00-3.50% of Cr, 1.30-1.80% of Mo, 0.05-0.20% of V, 0.02-0.10% of Nb, 0.01-0.04% of Als, 0-0.015% of P, 0-0.005% of S and the balance Fe and inevitable impurities. The technological process comprises the steps of steel making, casting of steel ingots, heating, blooming, hydrogen diffusion, heating, steel rolling and heat treatment. A brand-new production method of the hot-working die steel plate is provided. The steel plate has the good comprehensive mechanical performance, and the preparation method of the steel plate is good in production stability and concise in technological process and facilitates batch production of hot-working die steel.

Description

technical field [0001] The invention relates to a hot work die steel and a preparation method thereof. Background technique [0002] In recent years, my country's die steel industry has developed rapidly, and my country's hot work die steel research has also made great progress. The rapid development of modern manufacturing has put forward higher requirements for the performance of hot work die steel. There are two main ways to improve the performance of hot work die steel: one is to optimize the steel composition and develop new steel; the other is to improve the production process and optimize the process technology on the basis of the fixed composition. As early as in the "Twelfth Five-Year Plan", my country put forward clear requirements for the research and development of hot work die steel. [0003] Domestic hot work die steel is mainly forged, and there are also some round bars made by rolling process. However, it is difficult to expand the production scale of hot wo...

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Problems solved by technology

[0003] Domestic hot work die steel is mainly forged, and there are also some round bars made by rolling process. However, it is difficult to expand the production scale of hot work die steel plate by rolling process. There are two main reasons: first, it is generally believed that rolling The quality of the core of the hot work die steel plate made by the process is poor, and it is not suitable for making relatively high-end dies

The second is that the continuous casting and rolling method is used in China to produce hot work die steel. The entire process is complicated, difficult to control, and the product qualification rate is low.

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