Metal treatment – Compositions – Heat treating
Patent
1982-02-16
1983-11-15
Skiff, Peter K.
Metal treatment
Compositions
Heat treating
75123J, 148 36, C21D 802, C22C 3812
Patent
active
044153767
ABSTRACT:
This invention is directed to a hot-rolled steel sheet having an essentially refined ferritic grain size, a balanced chemical composition comprising, by weight, 0.06 to 0.09% carbon, 1.0 to 1.6% manganese, 0.5% maximum silicon, 0.03 to 0.05% columbium, 0.06 to 0.12% vanadium, 0.010 to 0.025% nitrogen, 0.004% maximum sulfur, 0.02% maximum phosphorus, 0.02 to 0.08% aluminum, balance essentially iron, and characterized by 80 ksi minimum yield strength, improved transverse bendability, and improved sheared edge stretchability.
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Pradhan, "Effect of Sulfur on Forming Properties of Hot Rolled HSLA Steel Sheet," Mechanical Working and Steel Processing XVII, The Iron & Steel Society of AIME, Warrendale, PA, 1979, pp. 1-18.
Grozier, "Production of Microalloyed Strip and Plate by Controlled Cooling," Microalloying '75, Wash., D.C., Oct., 1975, Session 2A, pp. 23-32.
Greday, "The Combined Effects of Microalloying with Cb and V," Microalloying '75, Wash., D.C., Oct., 1975, Session 1, pp. 145-158.
Bramfitt Bruce L.
Hansen Steven S.
Harper Donald L.
Pradhan Roger R.
Bethlehem Steel Corporation
Iverson John I.
Noll William B.
Skiff Peter K.
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