H13 is the correct choice when production volumes exceed 500,000 shots, when abrasive or glass-filled resins are involved, or when operating temperatures run above 200°C. S136 is required for corrosive resins (PVC, flame retardants), food-contact applications, and optical parts that demand. In this guide, we will break down the three most common steel grades we use at HordRT—P20, H13, and S136—to help you make the. In injection molding, injection mold steel is the "hidden engine"—it directly impacts product precision, production efficiency, and long-term costs. We make forging dies and need to repeatedly machine like 3 millimeters off of 300x300mm 50HRC H13 blocks, currently we use APKT/APMT carbide indexable tools, but is there a more efficient/economic tool strategy to that? I don't have experience with tools that are made specifically for facemilling. Many machinists face this exact challenge when working with H13 tool steel for die molds. However, these same properties can quickly turn your machining project into a costly.
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