The Alloy Steels for Boilers and Pressure Vessels segmentation by application distinguishes five principal end‑use groups: Power Generation, Oil & Gas, Chemical & Petrochemical, Food & Beverage, and Marine & Shipbuilding. Power Generation, driven by coal, gas and nuclear plants, dominates the market, accounting for roughly 40 % of total demand, as its high‑temperature and high‑pressure requirements necessitate robust alloy grades such as Cr‑Mo and Ni‑based steels. The Oil & Gas segment contributes about 25 %, reflecting the need for corrosion‑resistant alloys in upstream drilling rigs and downstream refineries. Chemical & Petrochemical uses represent 18 % of the market, where aggressive media demand alloys with superior acid‑resistance. Food & Beverage, at 10 %, relies on sanitary‑grade alloys for hygienic processing equipment. Marine & Shipbuilding, comprising the remaining 7 %, requires alloys that tolerate cyclic loading and seawater corrosion. Collectively, these applications shape the overall market size by allocating capital investment, production volumes, and R&D focus across the alloy steel portfolio.