Ferromagnetic　materials　underwent　plastic　deformation　under　stress,　which　in　turn　caused　damage　to　the　components.　Nondestructive　testing　could　protect　the　components　from　hazards.　In　this　paper,　the　micromagnetic　detection　technology　was　proposed　to　quantitatively　evaluate　the　stress　and　plastic　deformation　of　DH　steel.　According　to　the　stress-strain　curve　of　DH　steel,　tensile　specimens　with　different　amounts　of　deformation　were　obtained.　The　tangential　magnetic　field,　Barkhausen　noise,　incremental　permeability　and　eddy　current　signals　were　synchronously　acquired　by　the　micromagnetic　detector　on　DH　steel.　The　feature　parameters　of　the　four　types　of　signals　were　extracted.　The　coefficient　of　variation　was　used　as　an　index　to　evaluate　the　repeated　detection　performance　of　the　micromagnetic　detector.　The　related　feature　parameters　were　selected　as　the　input　of　the　multiple　linear　regression　model.　The　results　showed　that　the　incremental　permeability　signal　was　the　most　sensitive　to　stress.　The　absolute　errors　of　the　multiple　linear　regression　model　for　stress　and　plastic　deformation　were　±1.5%　and　±40 MPa,　respectively.　©　2024,　The　Author(s),　under　exclusive　license　to　Springer　Nature　Switzerland　AG.