A333 Pipe is a popular grade of Carbon Steel Pipe. A333 Grade 6 Pipe standard covers wall seamless and welded carbon steel pipe intended for use at low temperatures. A333 Seamless Pipe (ASME S/A-333) comes under low temperature service so its is also known as A333 Low Temp Pipe. A333 Pipe Material specification covers nominal (average) walled pipe almost exclusively in seamless. ASTM A333 Gr.6 Seamless Pipe is a low alloy steel similar to 4032 in properties.