Microstructure

interfacial morphology and mechanical properties of H90/steel/H90 cladding strip in inversion solidification have been investigated

and the bonding mechanism on interface has been expounded. The observation of optical microscope （OM） and scanning electron microscope （SEM） indicate that the microstructure in H90 cladding is composed of equi-axed grain

and the microstructure change of steel strip has not been observed before and after cladding

and interface layer with 4μm in thickness is generated

in which the diffusion of Cu and Fe into interface and the diffusion-absent of Zn have been observed. Bending test and multi-pass small-reduction cold-roll show that the interface of cladding strip is firmly bonded. Tensile test shows that although there exists slightly difference in mechanical properties among the cladding strips with varied cladding thickness

all them can meet the requirements of GB5213-85 for F-grade deep-drawing steel sheet.