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Structure and properties of large-section 4Cr13V corrosion-resistant plastic mold steel
Today, plastics, together with steel, wood, and cement, constitute the four basic materials of modern society. Most plastic products rely on molds for molding, and plastic mold steel has quickly become a special steel series. 4Cr13V steel is a commonly used corrosion-resistant plastic mold steel. It is a martensitic stainless steel. This steel has good machining performance. After heat treatment, it has excellent corrosion resistance, polishing performance, high strength and wear resistance. , suitable for manufacturing plastic molds that bear high load, high wear resistance and are under the action of corrosive media, as well as transparent plastic product molds.
The quality of large-section 4Cr13V corrosion-resistant plastic mold steel modules fluctuates greatly during production, and there are often serious defects such as looseness, primary carbide residues, segregation, and inclusions, which have a negative impact on subsequent performance.
Scientific researchers used metallographic microscopes, scanning electron microscopes, hardness tests, impact toughness tests and other experimental analysis methods to study the inclusions in different positions of high-quality large-section 4Cr13V corrosion-resistant plastic mold steel modules produced by a domestic steel plant after improving the forging process. , the differences in annealing structure, carbide size, heat treatment structure and mechanical properties, and analyze the possible factors causing the differences. The results show that the purity of the large-section 4Cr13V corrosion-resistant plastic mold steel module is higher, and the degree of spheroidization of carbides at the edges is the best. The closer to the center, the more large-sized carbides are. The existence of these large-sized carbides has an impact on the mechanical properties. It has certain adverse effects and is the main factor causing the difference in performance of the edge and center parts.
