BQ Plate SA 516 GR 70 refers to a specific type of steel plate used in various industries, particularly in pressure vessel fabrication. Here's a breakdown of the designation: - "BQ" stands for Boiler Quality - "Plate" indicates the product form - "SA" stands for American Society for Testing and Materials (ASTM) Standard - "516" is the specific ASTM standard number for pressure vessel plates - "GR 70" indicates the grade of the steel, which is Grade 70 SA 516 GR 70 steel plates are known for their excellent notch toughness, weldability, and resistance to hydrogen sulfide corrosion. They are commonly used in: - Pressure vessels - Boilers - Storage tanks - Heat exchangers The key characteristics of SA 516 GR 70 steel plates include: - High tensile strength - Good ductility - Resistance to corrosion - Ability to withstand high temperatures These plates are widely used in various industries, including oil and gas, petrochemical, and power generation.