These hardened and tempered, corrosion-resistant steels contain approx. 13 to 17 % Chromium as well as additions of Molybdenum and Nickel and achieve high yield strengths combined with good toughness. Such steels are usually supplied in the as heat-treated condition to approx. 30 to 42 HRC. Omission of further heat treatments improves cost-effectiveness and logistics in toolmaking.
This group of steels is specifically intended for use as corrosion-resistant tool steel in plastics processing.
Pre-tempered steels are steels that are already quenched and tempered by the steel supplier, usually with hardnesses of 30 to 40 HRC, and are then delivered to tool production in this condition. By omitting the heat treatment in the course of tool production, the economic efficiency can be significantly improved. With the delivery hardness in the range of approx. 30 to approx. 40 HRC, there is a good compromise between machinability and wear resistance or compressive strength (edge stability), which is sufficient for many applications in plastics processing.
Steels in this product group are usually selected martensitic stainless steels with approx. 13 to 17 % Cr , alloyed with Mo and Ni and a C content of approx. 0.30 to 0.40%.
In the production of these steels, special consideration is given to the needs of plastics processing with regard to polishability and corrosion resistance in terms of purity, homogeneity and analytical balance.
In special cases, the microstructure is specifically optimised by a special analytical balance, and sulphur is added in small proportions (0.10 to approx. 0.20%) to improve machinability. However, due to the addition of sulphur, losses in corrosion resistance and polishability have to be taken into account.
RoyAlloy is a high-performance stainless mold base tool steel designed to deliver exceptional durability and efficiency in demanding tooling environments. It is developed to meet the requirements of mould bases and molds where demands on surface finish, service life, and corrosion resistance are more moderate. The material offers an attractive balance between performance, machinability, and cost, making it a competitive option for standard applications in the plastics industry. Benefits Unlike conventional stainless steels, RoyAlloy is supplied in a pre-hardened condition of approximately 30 HRC, eliminating the need for additional heat treatment. This significantly reduces lead times and production costs while ensuring dimensional stability throughout machining and finishing processes. RoyAlloy’s superior corrosion resistance sets it apart in applications where moisture or humid environments can compromise tool life. By minimizing rust and surface degradation, it ensures longer service intervals and reduced maintenance costs. The material’s homogeneous structure and stable mechanical properties provide good dimensional stability and sufficient strength for applications involving short to medium production runs or less demanding plastics. The steel’s weldability and repairability further enhance its value, allowing easy maintenance and extending tool lifespan.
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