... in wall thickness, as well as corresponding square and rectangle tube. B.Specification of pipes 1.Pipe OD: 8mm-20mm Square & ... Metallurgical Machinery Manufacturing CO.,LTD. has a history of more than 14 years in the steel equipment manufacturing industry,with an annual ... Europe,Kazakhstan,Kenya,India and some other countries.We have won overseas customer's trust. A Variety of Specifications Steel Pipe ...