Novel non-quenched-and-tempered plastic die steel plate and preparation method thereof

Abstract

The invention provides novel non-quenched-and-tempered plastic die steel plate and a preparation method thereof. The steel plate is prepared from the following components in percentage by weight: 0.35to 0.40 percent of C, 0.52 to 0.56 percent of Si, 1.7 to 1.9 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.005 percent of S, 2.0 to 2.3 percent of Cr, 0.04 to 0.06percent of Nb and the balance of Fe and unavoidable impurities. The preparation method comprises the following steps: heating a plate blank at temperature of 1,200 to 1,220 DEG C; carrying out open rolling at open rolling temperature of 1,100 DEG C, and carrying out final rolling at final rolling temperature of 890 to 930 DEG C; after rolling, carrying out air cooling to 200 to 300 DEG C, and carrying out tempering at 550 to 580 DEG C; and carrying out net heat preservation for 1.5 to 2.0 min/mm. By optimal component design and cooperation with hot rolling and tempering processes, the shortcoming of high quenching crack sensitivity of plastic die steel is overcome; and meanwhile, a prehardening effect is achieved, and the energy consumption is reduced.

Description

technical field [0001] The invention belongs to the field of ferrous metal materials, and in particular relates to a non-quenched and tempered plastic mold steel plate and a preparation process thereof. Background technique [0002] Injection molding provides an efficient and economical production method for mass production of plastic products with complex shapes, smooth surfaces and high dimensional accuracy requirements. In recent years, with the requirements of lightweight automobiles and the vigorous development of industries such as household appliances and electronic communication equipment , Injection molded parts are increasingly used in the automotive industry, home appliances, and communications manufacturing. Due to the long production cycle, large investment, high manufacturing precision and high cost of injection molds, the long-term production operation has made mold manufacturers focus on obtaining longer mold life, that is, "mold risk control". The so-called...

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Problems solved by technology

[0004] When the quenching and tempering process is used, the different cooling rates of different thickness sections of the steel plate lead to uneven hardness, and the temperature difference of the section during the quenching process produces internal stress, which increases the tendency of quenching cracking

In addition, processes such as die casting, forging, controlled rolling and controlled cooling, and off-line quenching and tempering all have disadvantages such as many production links, long cycle times, low production efficiency, and difficult cost control.

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