SA 387 Gr 22 is a type of steel plate material that is commonly used in high-temperature applications. Here are some key properties and characteristics of SA 387 Gr 22 steel: - SA 387 Gr 22 is a chromium-molybdenum alloy steel plate - It is a pressure vessel grade steel plate - The "22" in Gr 22 indicates the tensile strength of the steel, which is 22 ksi (155 MPa) - SA 387 Gr 22 has a composition of: - Carbon: 0.05-0.15% - Manganese: 0.5-1.0% - Chromium: 2.0-3.0% - Molybdenum: 0.9-1.4% - Silicon: 0.5% - SA 387 Gr 22 has a yield strength of 22 ksi (155 MPa) and a tensile strength of 40-60 ksi (275-415 MPa) - It has good weldability and is often used in high-temperature applications such as: - Boilers - Pressure vessels - Heat exchangers - Piping and tubing SA 387 Gr 22 is a versatile steel plate material that can be used in a variety of industries, including power generation, petrochemical, and oil and gas. If you have any specific questions or need more information, feel free to ask!