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Hardness, Wear Resistance, and Toughness The hardness and wear resistance of steel are crucial in mold manufacturing. This is because molds are subjected to continuous wear from molten plastic during the injection process, especially when the plastic contains hard fillers like glass fibers, which can cause more damage. Additionally, molds endure impacts during operation, necessitating a certain level of toughness to prevent cracking. When dealing with high-temperature plastics, the demand for wear-resistant steel intensifies, calling for the use of high-performance mold steel.
Polishing Performance High-quality mold steel should have a high purity level with a fine, uniform structure to ensure a flawlessly polished mold surface. The presence of pores, impurities, or other defects on the mold surface can adversely affect the appearance of the final product. For instance, S136 steel is renowned for its exceptional polishing properties.
Weldability Molds inevitably experience wear and accidental damage during use, and sometimes adjustments are needed due to design changes. The weldability of mold steel is thus extremely important as it determines the ease and feasibility of mold repairs and modifications.
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Corrosion Resistance For molds processing corrosive plastics, the use of corrosion-resistant steel is essential. Common corrosion-resistant steels include S136, , 420, , and M333. Moreover, for molds frequently changing production batches, excellent corrosion resistance can reduce the need for rust-prevention maintenance.
Minimal Deformation in Heat Treatment During heat treatment, mold steel hardens, increasing the difficulty of machining and thereby the cost. To improve production efficiency and reduce costs, it is necessary to use steel materials with uniform internal structures that exhibit minimal deformation during heat treatment. Such materials will not develop excessive internal stresses or deformities, ensuring the precision and longevity of the mold.
In summary, selecting the appropriate mold steel material is crucial not only for ensuring the quality of plastic products but also for enhancing the durability of the molds, reducing production and maintenance costs, and improving the efficiency and economics of the entire production chain.
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