Composite steel plate for plastic mold and manufacturing method of composite steel plate

Abstract

The invention discloses a composite steel plate for a plastic mold. The composite steel plate is formed by two or more homogeneous billet layers through cladding rolling. The omposite steel plate forthe plastic mold comprises, by mass, 0.10-0.30% of C, 0.10-0.80% of Si, 1.00-2.00% of Mn, 1.00-2.00% of Cr, 0.01-0.50% of Mo, 0.01-1.00% of Ni, 0.01-0.10% of V, 0.01-0.10% of Ti, 0.010-0.070% of Al and the balance Fe and other inevitable impurities. Correspondingly, the invention further discloses a manufacturing method of the composite steel plate for the plastic mold. The composite steel plate for the plastic mold is uniform in thickness and section structure.

Description

technical field [0001] The invention relates to a composite plate and a manufacturing method thereof, in particular to a composite steel plate and a manufacturing method thereof. Background technique [0002] With the development of industrial production technology and the continuous emergence of new materials, plastic products have become an important industrial material and are widely used in various sectors of the national economy. From spacecraft to ships, from building materials to agricultural production, from household appliances to children's toys, plastic products are inseparable. For this reason, the output value of plastic molds in many industrially developed countries has ranked first in the mold manufacturing industry. [0003] Steel for plastic molds is divided into major categories, including steel for mold base mold manufacturing and steel for cavity mold manufacturing. Among them, the steel plate thickness of the cavity mold steel is usually 15-500mm. In o...

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Problems solved by technology

[0004] However, for a long time, the steel for molds in the prior art has adopted a medium-carbon alloy composition design system. The content of precious metals such as Cr, Ni, and Mo in the steel of this system is relatively high, and it needs to be quenched and tempered to obtain the mold when making the mold. Desired properties and hardness requirements

[0005] In recent years, a series of non-quenched and tempered plastic mold steels have been gradually developed, but the current non-quenched and tempered plastic mold steels have the following problems: thicker steel plates are often limited by the thickness of the continuous casting slab, and the compression ratio in the rolling process is not enough. As a result, the internal quality of the steel plate is poor, which affects the uniformity of the product structure and mechanical properties; while the production by die casting and electroslag remelting will lead to a substantial increase in production costs and low production efficiency

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