Cold deformable, high strength, hot rolled bar and method for pr

Details Cold deformable, high strength, hot rolled bar and method for pr Cold deformable, high strength, hot rolled bar and method for pr

1995-06-06

1996-09-10

Yee, Deborah

Metal treatment

Stock

Ferrous

148334, 148602, 148654, C21D 802, C22C 3814, C22C 3812

Patent

active

055542336

ABSTRACT:
A billet of steel has a composition comprising small amounts of hardenability agents. The billet is hot rolled into a continuous bar, in two hot rolling stages with an intervening cooling step employing a turbulent cooling liquid. After the second hot rolling stage, the bar is gathered into a succession of closely overlaying loops and moved along a roller conveyor where the overlapping loops are cooled by air blowers, after which the bar is coiled. The resulting hot rolled bar has a microstincture consisting essentially of bainite in fine-sized packets reflecting an average austenitic grain size, before the gathering and cooling steps, of 8-11 ASTM. A threaded fastener in its final form can be produced from the hot rolled bar by a cold deforming operation without a heat treating operation before or after cold deforming. The threaded fastener is undistorted and contains residual compressive stresses.

REFERENCES:
patent: 3926687 (1975-12-01), Gondo et al.
patent: 4219371 (1980-08-01), Nakasugi et al.
patent: 4289548 (1981-09-01), Bucher et al.
patent: 4474627 (1984-10-01), Maitrepierre et al.
Edmonds, D. V., The Relationship Between Structure and Properties in Bainitic Steels, Iron & Steelmaker, pp. 75-84 (Nov., 1990).
Serin, et al., Transformation characteristics and properties of low-carbon Nb-B steels, pp. 1-17, reproduced from Memoires Scientifiques de la Revue de Metallurgie, 75, 355-369 (Jun. 1978).

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