Chemical composition of SA302 Gr.C steel plate:
Carbon (C): ≤0.25% (requirements vary by thickness; e.g., ≤0.20% for thickness ≤25mm)

SA302 Gr.B Steel Plate Standards and Origins:
SA302 Gr.B falls under the ASTM A302/A302M standard, jointly established by the American Society of Mechanical Engineers (ASME) and the American Society for Testing and Materials (ASTM).

In industrial sectors such as petroleum refining, chemical synthesis, and power generation, pressure vessels often require stable, long-term operation under conditions involving moderate temperatures, high pressures, and even corrosive media.

Standard Classification: Complies with ASME SA302/ASTM A302 specifications, applicable to manganese-molybdenum and manganese-molybdenum-nickel alloy steel plates for pressure vessels.

Executive Standard: SA299 Gr. B steel plates comply with the ASME standard, specifically ASTM A299/A299M.