Segmentation by Types categorises cold‑forged valve‑train components according to manufacturing methodology and resulting geometry. The primary categories are open‑die forgings, closed‑die forgings, and precision rolled components. Open‑die forgings, typically used for larger, less complex shapes, contribute modestly to the market but provide flexibility for custom specifications. Closed‑die forgings dominate the segment, delivering high‑volume, near‑net‑shape parts such as valve stems and cam lobes with superior material utilization and repeatability; this category underpins the bulk of revenue in the sector. Precision rolled components, including thin‑walled rings and flanges, address applications where tight thickness control and surface integrity are paramount, adding a niche yet growing share. Sub‑type analysis reveals that within closed‑die forgings, pre‑heated die and cold‑die processes further differentiate cost structures and mechanical properties. Collectively, these type classifications delineate the production pathways that feed the application segments, shaping the overall market size through their respective capacity, yield, and cost profiles.