Reading Corner ~ ~ kind of plastic mold steel selection and thin Xintao (Baosteel Group Shanghai No.5 Steel Co. Forge) This paper describes a plastic mold steel performance requirements and carburizing, quenching and hardening, Pan hard type, resistance erosion and other types of plastic mold steel materials selection and, in addition, also lists some common import plastic mold steel grades.

With the rapid development of the plastics industry, plastic isotropic good. With the sharp increase in demand. According to reports, many industrialized countries plastic mold production value has leapt to the top of the mold manufacturing. In order to adapt to the increasingly large size plastic products, complex shape and surface decoration of the beautiful, plastic mold is moving large-scale, complex, precision and multi-cavity direction.

Performance plastic mold steel requires an injection molded plastic products (injection molding), compression (compression molding), extrusion, injection pressure and a variety of methods blow molding, which is equipped with plastic parts divided into two categories. One for the structure, including the gating system, the guide, the stationary platen, the top of the body parts, support, etc., the choice of material is generally in low-carbon or carbon structural steel alloy structural steel and carbon tool steel, some of which standard product supply spare parts on the market; the other for molded parts, including the cavity, core, mosaic pieces, is a key component directly molded plastic products. Moldings complex structure, requiring dimensional precision sulfur joints adhesion and surface smoothness, strength and toughness of the materials used, though not required, such as hot and cold die mold as high, but it must have the following specific performance requirements.

Table 1 carburizing plastic mold steel steel code chemical composition (mass fraction) Standard Other Note 1: Standard GyT 699-1999 listed steel, ISC code for high-quality steel.