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Contents Foreword 1 Scope 2 Normative references 3 Classification and code 4 order content 5 Shape, dimension and weight 6 Technical requirements 7 Test methods 8 Inspection rules 9 Packaging, marking and quality certificate Annex A (Normative) Shape and dimension of steel tubes Annex B (Normative) Measurement method of torsion value of special-shaped steel tubes |