... Steel Tube Co.,Ltd. At present, with an area of 119,000 square meters,we are armed with advanced production equipment,large clean working ... -80mm for thickness and large-size ERW steel tube with specification range of 325-1420mm for dia, 10-80mmfor thickness. Meanwhile, we ... bridges,ship building ,tranferfluid and gas etc.With the annual output of 150,000 tons of pipes,our products are marketed to all ...