Alloy Steel ASTM A204 A,B,C ASTM A204 specification covers molybdenum alloy steel plates, intended particularly for welded boilers and other pressure vessels. ASTM A 204plates are available in three grades (Grade A, Grade B, Grade C) having different strength levels. The steel shall conform to the chemical requirements specified. These steel grades are normally used for High temperature pressure vessel steel plates and steel boiler plates. For A204 Grade A and SA204 Grade A pressure vessel steel plate, the minimum yield strength is 255 mpa, tensile strength within 450-585 mpa, for A204 Grade B and SA204 Grade B pressure vessel steel plate, the minimum yield strength is 275 mpa, tensile strength within 485-620 mpa, for boiler steel plate A204 Grade C and SA204 Grade C, yield strength shall be above 295 mpa, tensile strength from 515 mpa to 655 mpa. This specification covers molybdenum- alloy steel plates, is used in fabricators serving industry especially in gas, oil, chemical supply industries, infrastructure development, agriculture and boilers manufacturers. Conquest Steel & Alloys is an experienced boiler and pressure steel plate supplier which can offer you ASTM A204 steel plate of all grade (Grade A, Grade B, and Grade C) and dimension ranges as below.