ANNEALED AND ZINC-PLATED STEEL PLATE, AND METHOD USED FOR ITS MANUFACTURE Russian patent published in 2012 - IPC C23C28/00 C23C2/06 

FIELD: metallurgy.

SUBSTANCE: annealed zinc-plated steel plate includes steel plate, annealed zinc-plated layer and oxide film on Mn-P basis. Zn-Fe alloy phase in annealed zinc layer is determined with X-ray phase analysis method. Ratio of intensity of diffraction peak "Г" (2.59 Ǻ) corresponding to interplane distance d-2.59 Ǻ of "Г"-phase and intensity of diffraction peak δ₁(2.13 Ǻ) corresponding to interplane distance d=2.13 Ǻ of δ₁-phase is less than or equal to 0.1. Ratio of intensity of diffraction peak ζ(1.26 Ǻ) corresponding to interplane distance d=1.26 Ǻ of ζ-phase and intensity of diffraction peak δ₁ (2.13 Ǻ) corresponding to interplane distance d=2.13 Ǻ of δ₁-phase is more than or equal to 0.1 and less than or equal to 0.4. Oxide film on Mn-P basis if formed at application of 5 to 100 mg/m² of Mn and 3 to 500 mg/m² of P to surface of annealed zinc layer.

EFFECT: invention allows obtaining annealed zinc-plated steel plate having good weldability and ability to application of the coating.

7 cl, 10 dwg, 2 tbl