Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Patent
1993-07-23
1995-10-03
Silverman, Stanley S.
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
148601, C22C 3832
Patent
active
054548870
ABSTRACT:
A process for manufacturing a medium-carbon steel plate having a graphitization of 50% or more with improved formability and weldability is disclosed, the process comprises the steps of:
hot rolling a steel with a finishing temperature of 700.degree.-900.degree. C., the alloy composition of the steel consisting essentially of, by weight %:
C: 0.20-0.70%,
Si: more than 0.20 but not more than 2.00%,
Mn: 0.05-0.50%, P: not more than 0.020%,
S: not more than 0.010%, sol. Al: 0.01-1.00%,
B: 0.0003-0.0050%, N: 0.002-0.010%,
B/N: 0.2-0.8,
Cu: 0-1.00%, Ni: 0-2.00%, Ca: 0-0.010%, and
Fe and incidental impurities: balance,
cooling the resulting hot-rolled steel plate at a cooling rate of 5.degree.-50.degree. C./s,
coiling the steel plate at a temperature of 400.degree.-650.degree. C., and
optionally, cold rolling the hot-rolled steel plate with a reduction in thickness of 20-85%, and
annealing the cold-rolled steel plate at a temperature of 600.degree.- Ac.sub.1 for 1 hour or longer.
REFERENCES:
patent: 5108518 (1992-04-01), Fukui et al.
patent: 5139583 (1992-08-01), Kawabata et al.
patent: 5156691 (1992-10-01), Hollenberg et al.
Ip Sikyin
Silverman Stanley S.
Sumitomo Metal Industries Ltd.
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