RUSTPROOF STEEL SHEET EXCELLENT IN VARIOUS CHARACTERISTICS INCLUDING CORROSION RESISTANCE

摘要

A Zn-Cr plated steel sheet which is excellent in corrosion resistance and has a phase structure containing heretofore unknown phases (eta)x, (delta)x and (tau)x. The following charateristics (1) to (6) are exhibited by one or a combination of these phases: (1) (eta)x resistance to surface rusting; (2) (tau)x moldability; (3) (eta)x+(delta)x chipping resistance; (4) (eta)x+(tau)x corrosion resistance after working; (5) (delta)x+(tau)x secondary adhesion in warm water; (6) (eta)x+(delta)x+(tau)x resistance to pitting corrosion, (eta)x: hexagonal, a = 2.66 Ÿm(K) 2.74 AA, c = 4.61 Ÿm(K) 4.95 AA, (delta)x: hexagonal, a = 2.72 Ÿm(K) 2.78 AA, c = 4.43 Ÿm(K) 4.60 AA, (tau)x: cubic, a = 3.00 Ÿm(K) 3.06 AA.