The BQ Plate SA 516 GR 60 refers to a specific type of steel plate used in various industrial applications. Here's a breakdown of the code: - BQ: Boiler Quality (a standard for steel plates used in boilers and pressure vessels) - Plate: Self-explanatory, it's a type of steel product - SA 516: This is the specification number from the American Society for Testing and Materials (ASTM) - GR 60: Grade 60, indicating the minimum yield strength of the steel (in this case, 60, 000 psi or 415 MPa) SA 516 GR 60 steel plates are known for their excellent weldability, toughness, and resistance to corrosion. They're commonly used in: 1. Boilers and pressure vessels 2. Storage tanks 3. Heat exchangers 4. Piping and pipelines