C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 38/14 (2006.01) C21D 7/00 (2006.01) C21D 7/13 (2006.01) C21D 8/00 (2006.01) C21D 8/06 (2006.01) C22C 38/12 (2006.01) C22C 38/16 (2006.01) C22C 38/32 (2006.01) C22C 38/38 (2006.01) C22C 38/54 (2006.01) C22C 38/58 (2006.01)
Patent
CA 2135255
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 overlapping 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 microstructure 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.
Brown Birchel S.
Heitmann William E.
Inland Steel Company
Ridout & Maybee Llp
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