SA 204 Grade A is a specification under ASTM A204 / ASME SA204, which covers molybdenum-alloy steel plates primarily used for pressure vessels and boiler components operating at elevated temperatures. 🔹 SA 204 Grade A – Key Highlights: Standard: ASTM A204 / ASME SA204 Grade: A (other grades include B and C, with increasing strength) Type: Molybdenum-alloy pressure vessel steel plate Application: Boilers, pressure vessels, heat exchangers, and related high-temperature equipment 🔹 Chemical Composition (Typical %): Element Grade A Carbon (C) 0.15 max Manganese (Mn) 0.44–0.94 Phosphorus (P) 0.035 max Sulfur (S) 0.035 max Molybdenum (Mo) 0.45–0.65 🔹 Mechanical Properties: Property Value Tensile Strength 415 – 585 MPa Yield Strength ≥ 240 MPa Elongation 22% minimum (in 200 mm) 🔹 Equivalent Grades: Standard Equivalent Grade EN (Europe) 16Mo3 (close equivalent) DIN 1.5415 BS 620B (similar) 🔹 Typical Applications: Steam boilers Heat exchangers Petrochemical equipment Pressure vessels for high-temperature service