Plastic mold steels

Samson Extra Steel, Plastic mold steel with easy bobbing. Carpenter Technology Corp. [Pg.933]

Thyroplast, Plastic mold steel, Thyssen Specialty Steels, Inc. [Pg.940]

Type Corrosion resistant plastic mold steel (good machinable) Tempered mold steel Tempered and hardened mold steel (highly polishable and etchable)... [Pg.366]

Pre-hardened plastic mold steels (hardness -31 HRC) Hardened plastic mold steels (hardness -62 HRC) Case hardening steels (hardness -62 HRC) Surface finished steels (700-3500 HV)... [Pg.447]

FIGURE 3.2 Schematic diagram of the main steps in producing plastic mold steels for large dimensions... [Pg.449]

The desired plastic forming is mostly carried out under hydraulic presses, to ensure the required material properties. After forming, the steel manufacturer carries out suitable heat treatment, which may be either preliminary heat treatment prior to machining, or final heat treatment in the case of pre-hardened plastic mold steels. [Pg.449]

The transformation behaviour of plastic mold steels are described in time, temperature, transformation (TTT) curves in order to better understand the transformation processes involved in hardening and in austenitizing. [Pg.451]

Information and recommendations on the heat treatment of plastic mold steels are shown in the relevant material data sheets of the steel manufacturers. [Pg.452]

The pre-hardened plastic mold steel 1.2312 (40CrMnMoS8-6) is not suitable for molds with high surface requirements or mechanical stresses, because of its high sulphur content. In combination with manganese, the sulphur forms long-chain sulfides that can cause the following problems ... [Pg.452]

FIGURE 3.5 Polishability of plastic mold steels as a function of hardness... [Pg.453]

Widely differing, and sometimes conflicting, demands are made on plastic mold steels in the course of their processing and use as a material for molds, so there is no single steel grade that can fully satisfy all requirements in terms of quality and economic considerations. The most important requirements are [2] ... [Pg.453]

These requirements inevitably translate into different properties profiles for plastic mold steels. The different steel concepts can be grouped as follows ... [Pg.454]

Pre-hardened plastic mold steels for all standard applications (hardness range... [Pg.454]

Through-hardening plastic mold steels for hardening after (pre-)machining, e.g. for molds and tools subject to high wear (hardness range 44 to 62 HRC)... [Pg.454]

Corrosion-resistant plastic mold steels e.g. for PVC processing, pre-hardened to approximately 30 HRC for standard applications, up to 53 HRC for high levels of wear, with hardening after (pre-)machining... [Pg.454]

Precipitation hardening plastic mold steels for high-wear applications hardness after precipitation hardening 55 HRC... [Pg.454]

Table 3.2 shows the classification of plastic mold steels in terms of the most important features required. The steel materials used in mold and tool making for plastics processing are covered by the standard DIN EN ISO 4957 [3], except for a few more recent developments. The chemical compositions under this standard are summarised in Table 3.3 for the most common plastic mold steels. [Pg.454]

TABLE 3.2 Classification of plastic mold steels according to the most important features required... [Pg.455]

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