In　order　to　solve　the　problem　that　the　mechanical　properties　of　containers　and　pipelines　are　difficult　to　evaluate　during　service,　this　paper　focuses　on　the　quantitative　expression　of　hardness　and　mechanical　properties.　Taking　the　X70　pipeline　steel　as　the　research　object,　with　12　welds　of　the　tensile　test　and　192　times　the　hardness　of　indentation　test,　the　establishment　of　a　mathematical　application　suitable　for　engineering　applications.　The　results　shows:　The　hardness,　indentation　parameters　and　mechanical　properties　of　the　weld,　base　metal　and　heat　affected　zone　did　not　change　significantly　with　the　pipe　wall　thickness,　it　is　reasonable　to　test　the　hardness　of　the　outer　wall　of　the　pipeline　at　the　scene;　Vickers　hardness　distribution　can　effectively　explain　the　fracture　of　the　specimen,　hardness　and　plastic　work　was　inversely　proportional.　©　2018　Trans　Tech　Publications,　Switzerland.