... pipe/tubes 2/.Materials: Q195,Q235,Q345 3.Standard : ASTM Square stainless steel pipeSell square stainless steel pipe,seamless steel tube,SSTU,weldless pipe ... , seamless steel pipe . Sell stainless steel pipe,seamless steel tube,SSTU,weldless pipe, seamless steel pipe .1.Specification: WT: 0 ...