Low alloy tube knowledge: 27SiMn low alloy seamless steel pipe 27simn low-alloy seamless steel pipe = 27 silicon-manganese low-alloy seamless steel pipe, which is one of the seamless steel pipe materials, carbon content between 0.24-0.32%, simn single column is because of the five elements (carbon C, silicon Si, In manganese Mn, phosphorus P, sulfur S), the content of silicomanganese is about 1.10-1.40%. Various alloy pipes 16Mn, 27SiMn, 15CrMo, 35CrMo, 12CrMov, 20G, 40Cr, 12Cr1MoV, 15CrMo steel pipes are divided into two types of seamless steel pipes and welded steel pipes according to different production processes. Seamless steel tubes are seamless steel tubes made from steel ingots, tube blanks or steel bars. 27SiMn low alloy seamless steel pipe weight formula: [(outer diameter - wall thickness) * wall thickness] * 0.02466 = kg / meter (weight per meter) Source: http://?/4_4.html