... produce it, also we are a leading seamless steel pipe and tower crane manufacture in China Pipe ParametersOutside diameter(MM)Wall thickness(MM)Length(M ... #, 20#3, 30#, 45#, 16MN, 27SIMN, 37MN5, 35MN2V, 42CRMO, 40CR and other kinds of MN steel and CR steel. Seamless steel pipe