STEEL SHEET FOR CROWN CAP, METHOD FOR MANUFACTURING SAME, AND CROWN CAP

摘要

A steel sheet for crown caps includes C: 0.0005 to 0.0050%, Si: 0.020% or less, Mn: 0.10 to 0.60%, P: 0.020% or less, S: 0.020% or less, Al: 0.01 to 0.10%, N: 0.0050% or less, Nb: 0.010 to 0.050%, and Fe and inevitable impurities. The steel sheet has an average r value of 1.30 or more and a YP of 450 MPa or more and 650 MPa or less. The steel sheet is obtained by hot rolling a steel slab at a slab reheating temperature of 1,150° C. or higher and a finishing temperature of 870° C. or higher; coiling the hot rolled steel sheet at a coiling temperature of 600° C. or higher, performing pickling; then-performing primary cold rolling; performing annealing at an annealing temperature of recrystallization temperature or more and 790° ° C. or less; and performing secondary cold rolling at a rolling reduction of 10% or more and 50% or less.

主权项

1. A steel sheet for crown caps, the steel sheet comprising:
C: 0.0005 to 0.0050%, by mass %: Si: 0.020% or less, by mass %: Mn: 0.10 to 0.60%, by mass %: P: 0.020% or less, by mass %; S: 0.020% or less, by mass %: Al: 0.01 to 0.10%, by mass %: N: 0.0050% or less, by mass %: Nb: 0.010 to 0.050%, by mass %; and Fe and inevitable impurities, wherein the steel sheet has an average r value of 1.30 or more and a YP of 450 MPa or more and 650 MPa or less.