China Din2391 Seamless Steel Pipe manufacturers China Precision Cold Drawn Seamless Steel Tube/PipeStandard GB/T8713-88,GB/T3639-2009,DIN2391,EN10305.Cold Drawn Tube can be produced according to the demands of costumers that the degree of precision can reach H9/H11.Material Chemical Composition DIN2391 standard ST52,EN10305 standard E355,DIN 2391-1 Cold Drawn or Cold Rolled Steel Tube,DIN239153 rows·DIN 2391 standard specifies the Seamless steel tubes used forMechanical and
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