CS" stands for Carbon Steel - "PIPE" indicates that it's a pipe - "333" is the grade, specifically ASTM A333, which is a standard for seamless and welded steel pipes for low-temperature service - "GR" stands for Grade - "6" is the grade classification within the ASTM A333 standard, indicating the pipe's yield strength, tensile strength, and impact properties. So, CS Pipe 333 GR 6 is a carbon steel pipe that meets the ASTM A333 standard, Grade 6, which is suitable for low-temperature service. This type of pipe is often used in applications such as: - Low-temperature processing - Cryogenic applications - Pressure vessel construction - Piping for refrigeration and air conditioning systems