A: in order to know the square tube, can withstand the pressure calculation method for thick wall seamless steel pipe seamless steel pipe (steel pipe diameter specifications of spiral tube of different materials different tensile strength (pressure) = *2* thick steel material tensile strength) / (diameter * coefficient)
Two: to know seamless pipe seamless steel pipe diameter and pressure to calculate wall thickness calculation method: wall thickness = (pressure * outer diameter * coefficient) / (2* steel tube material tensile strength)
Three: square tube, spiral pipe steel pressure coefficient means: pressure P<7Mpa coefficient S=8 7< pipe pressure P<17.5 coefficient S=6 pressure P>17.5 coefficient S=4