ms square tube 1.steel grade: Q195-Q345,S235-S355 2. ... , STD, SCH40, SCH60, SCH80S, XS, SCH80 etc.0.3-20.00.3-20.00.3-2.00.5-2.0LengthAny LengthAny LengthAny ... , A53-A369, API J55-API P110, ST35-ST52, Q195-Q345, 20#, 16Mn, A53(A, B), API J55, API K55, API N80 ... ,square pipe3,square pipe4,square pipe,square pipe,square pipe ms square tube