Certain heat resistance and erosion resistance.
Due to the generally complicated structure of plastic molds, it requires low surface roughness and high precision for the cavity and excellent technical performance should be ensured. The specific requirement is as follows:
a) Slight deformation during heat treatment and sound hardenability.
b) Sound performance for cutting processing and superior polishing property and abrasion resistance.
c) For plastic molds employing cold extrusion forming process, it requires sound cold extrusion molding ability, and to make it convenient for molding, the hardness after anneal should be low, the plasticity good, and deformation resistance small. The deformation resistance after quenching is high.
d) Other processing properties, such as forging and jointing properties, should be fine.
Due to the enormous diversity of plastic materials and the widely varied requirements for plastic products, various requirements for the performance of plastic injection mold steel have been laid down. Therefore, many industrially developed countries have created an extensive range of plastic mold steel series, including carbon steel, carburized plastic mold steel, aging hardening plastic mold steel, corrosion resistant plastic mold steel, free machining plastic mold steel, through-hardening plastic mold steel, maraging plastic mold steel and mirror polishing plastic mold steel, etc.
Continuously growing activity in the area of the engineering plastics led to the necessity of developing new low-cost, high-performance plastic mold steels. In fact, when it is necessary to fabricate large plastic components, plastic mold steel exhibits low fracture toughness and highly inhomogeneous microstructures (continuously varying from surface to core), as obtained from the pre-hardening (quenching and tempering) of large blooms.
New alloys and alternative manufacturing routes may allow us to obtain plastic injection molds with good mechanical, wear and weldability properties. Precipitation hardening tool steels are being proposed for such an application, yielding improved mechanical properties and lower overall costs and lead-times.
Pre-hardened mould steels are widely used for manufacturing mould for plastic. Because these steels are quenched and tempered to 30÷40 HRC, then manufactured into mould for plastic directly, the deformation and cracking of mould resulted from heat treatment can then be avoided. But this kind of steel is sometimes difficult to machine and good machinability of such mould steel is requested as standard.
One way to meet this requirement is to add a free-cutting element to steel. However, this method is not feasible. For example, if sulfur is added, the surface quality of the plastic product might be damaged because the area gathering large amounts of sulphide in steel deteriorates the etching property of mold. If expensive elements, such as selenium, tellurium, bismuth or zirconium are added, the cost will be increased; and if lead is added, the environmental impact would be too great.
Another way is to precisely control the composition, morphology and plasticity of nonmetallic inclusion in steel products. The strong influence of composition regulation during steel making on inclusion precipitation has been known for many years.
thanks for sharing your knowledge about mold steel
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