Building low yield ratio hot-dip galvanized cold rolled steel sh

Details Building low yield ratio hot-dip galvanized cold rolled steel sh Building low yield ratio hot-dip galvanized cold rolled steel sh

1990-11-21

1992-10-20

Dean, R.

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

148332, 148333, 148533, C21D 800, C23C 206

Patent

active

051566907

ABSTRACT:
A building low yield ratio hot-dip galvanized cold rolled steel sheet having an improved refractory property, consists essentially of, by weight, 0.1% or less of C, 0.1 to 1.5% of Mn, 0.1% of less of P, 0.06% or less of Al, 0.6 to 2.0% of Cu, and a remainder of Fe and unavoidable impurities and having a 0.6 times or more yield point strength at 600.degree. C. compared to that at normal temperatures. The method of forming the steel sheet comprises the steps of: forming a slab from a steel consisting essentially of, by weight, 0.1% or less of C, 0.1 to 1.5% of Mn, 0.1% or less of P, 0.06% or less of Al, 0.6 to 2.0% of Cu, and a remainder of Fe and unavoidable impurities, immediately or after heating the slab at a temperature of 1200.degree. C. or less, hot rolling the slab at a temperature of 750.degree. C. or more and cold rolling, effecting a continuous hot-dip galvanizing process, heating the rolled slab at a temperature of 700.degree. to 900.degree. C. in a reducing atmosphere, cooling the rolled slab at an average cooling rate of 3.degree. C./sec or more and dipping the rolled slab in a hot-dip galvanizing bath.

REFERENCES:
patent: 4525598 (1985-06-01), Tsukamoto et al.
patent: 4889566 (1989-12-01), Okada et al.

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