Cold rolled steel sheet exhibiting excellent press workability a

Details Cold rolled steel sheet exhibiting excellent press workability a Cold rolled steel sheet exhibiting excellent press workability a

1996-03-14

1998-12-08

Yee, Deborah

Metal treatment

Stock

Ferrous

148603, 148651, C22C 3814, C22C 3812, C21D 804

Patent

active

058463437

ABSTRACT:
A cold rolled steel sheet including about 0.001 weight percent or less of carbon (C), about 0.1 weight percent or less of silicon (Si), about 0.3 weight percent or less of manganese (Mn), about 0.05 weight percent or less of phosphorus (P), about 0.003 weight percent or less of sulfur (S), about 0.1 weight percent or less of aluminum (Al), about 0.002 weight percent or less of nitrogen (N), about 0.005 to 0.02 weight percent of titanium (Ti), about 0.001 to 0.01 weight percent of niobium (Nb), and the balance iron and incidental impurities. The total weight percent of carbon, sulfur, and nitrogen is about 0.004 weight percent or less. The content of titanium, carbon, sulfur and nitrogen satisfies the equation: about 4.times.(C wt %).ltoreq.(Ti wt %)-48/14(N wt %)-48/32(S wt %).ltoreq.about 12.times.(C wt %). The method of the invention includes uniformly heating a steel slab having a composition as described above at a temperature T(K) satisfying the following equation:

REFERENCES:
patent: 5360493 (1994-11-01), Matsuoka et al.
patent: 5542994 (1996-08-01), Jeto et al.

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