Thermal mechanical process for steel slabs and the product there

Details Thermal mechanical process for steel slabs and the product there Thermal mechanical process for steel slabs and the product there

1981-06-22

1983-07-26

Skiff, Peter K.

Metal treatment

Compositions

Heat treating

148 39, C21D 802

Patent

active

043952968

ABSTRACT:
This invention is directed to a thermal-mechanical process, and to the product thereof, for treating carbon or low alloy steels to improve their strength and toughness. The process is characterized by the steps of austenitizing a carbon or low alloy steel workpiece, preferably in the form of a slab, reducing said slab at a temperature above about 1900.degree. F. (1038.degree. C.) to a thickness in the range of 2 to 4 inches (5.1 to 10.2 cm), controlled quenching to effect thermal equilibration until a surface-to-center thermal gradient within a temperature range of 50.degree. to 150.degree. F. (28.degree. to 83.degree. C.) is reached, and initiating working such control quenched workpiece at an average temperature within the range of 1450.degree. to 1750.degree. F. (788.degree. to 954.degree. C.). The reduced steel product, having been treated in accordance with said thermal-mechanical process to yield a rolled steel plate having a thickness between about 0.5 to 1.25 inches (1.3 to 3.2 cm), is characterized by a fine-grained microstructure that is essentially grain size symmetrical from the center to the surface, with a grain size difference on the order of about 1 ASTM number, center to sub-surface, and by improved strength and toughness.

REFERENCES:
patent: 2356450 (1944-08-01), Epstein
patent: 3897279 (1975-07-01), Shaughnessy et al.
Fegredo, "Hold-Period Accelerated Cooling Experiments or Nb-, and Ti-HSLA Steels", Metals Technology, Sep. 1977, pp. 417-424.
Heedman et al., "Controlled Rolling of Plates with Forced-Water Cooling during Rolling", Metals Technology, Sep. 1981, pp. 352-360.
Mangonon, Jr. et al., "Subgrain and Precipitation-Strengthening Effects in Hot-Rolled, Columbium-Bearing Steels," Micro Alloying 75, Wash. D.C., Oct. 1975, pp. 49-60.

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