In the types dimension of Plastic Mould Steel, the market is differentiated by alloy composition, heat‑treatment capability, and surface‑finish characteristics. The most prevalent grade, P20, occupies the bulk of the market owing to its balanced hardness (≈30 HRC) and ease of machining, suitable for medium‑volume production across multiple applications. H13 steel, representing a high‑temperature, high‑hardness segment (≈45 HRC), is essential for moulds that undergo extreme thermal cycling, such as automotive and large‑scale consumer goods. S136 and 420 stainless‑steel grades, together comprising around 12 % of the market, provide the corrosion resistance required in medical and food‑contact moulds. 440C, noted for its high wear resistance, serves niche high‑precision sectors like aerospace components. Emerging high‑performance alloys, including Nitronic 60 and Maraging steels, are gaining traction for specialized applications demanding superior fatigue life. The distribution of these steel types reflects the technical demands of each application segment and underpins the overall market valuation.