Method for producing galvanized steel sheet

Details Method for producing galvanized steel sheet Method for producing galvanized steel sheet

1997-06-06

1999-12-07

Ip, Sikyin

Metal treatment

Process of modifying or maintaining internal physical...

Utilizing disclosed mathematical formula or relationship

148533, 148602, 148603, C21D 1100

Patent

active

059976640

ABSTRACT:
Method for producing a galvannealed steel sheet wherein a slab consisting essentially of C in an amount of 0.004 wt. % or less, N in an amount of 0.004 wt. % or less, Ti in an amount of 0.01 to 0.15 wt %, Si in an amount of 0.05 wt. % or less, Mn in an amount up to 2.5 wt. %, P in an amount up to 0.1 wt. %, S in an amount of 0.015 wt. % or less, sol. Al in an amount of 0.02 to 0.1 wt. % and the balance being Fe, is soaked for at least 30 minutes at a specified temperature (range). The soaked slab is hot rolled to produce a hot-rolled steel sheet which is coiled at a temperature of 500 to 700.degree. C. The coiled hot-rolled steel sheet is cold rolled at a reduction ratio of 60% or more to produce a cold-rolled steel sheet which is annealed at a temperature of from recrystallization temperature to Ac3 transformation temperature. Galvanizing the annealed cold-rolled steel sheet and then galvannealing at a temperature of 450 to 600.degree. C.

REFERENCES:
patent: 5384206 (1995-01-01), Ushioda et al.
patent: 5470403 (1995-11-01), Yoshinaga et al.

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