Abstract：The mechanical properties test of pipeline steel include tensile，bending，drop weight，impact and metallo-graphictests，amongwhichtensile testisthe mostconventionalandimportant test，fromwhichtheyieldstrength，ten-silestrength，yieldstrengthratioandotherstrengthpropertiesofthematerial canbeobtained，aswellastheelongation after fracture，the section shrinkageand other plastic indicators.There are many factors affecting the tensileproperties. Besidesthematerialitself，thepreparationandtestingprocessofthetensilesamplesarealsothekeyfactorsaffectingthe tensileproperties.Thesamplingandthe testarenotstandardized，whichwilllead tothedistortionoftheinspectionda-tas.Therectangularsection specimenis usually usedintheproductioninspectionof pipeline steel，butthethickness of pipelinesteelusedatpresentislarge，andsometimesitisnecessarytouseacircularsectionspecimenfortesting.Theef-fectofoperationdifferenceineverysamplingprocessesonthemechanicalpropertiesofpipelinesteelisstudied.
2019, Vol. 37 
