Metal treatment – Compositions – Heat treating
Patent
1988-06-20
1990-02-06
Yee, Deborah
Metal treatment
Compositions
Heat treating
148 12F, C21D 802
Patent
active
048986291
ABSTRACT:
The invention relates to a method of producing hot rolled strip having tensile strength values of Rm=500 to 780 N/mm.sup.2 from unalloyed or low-alloy steels with 0.3 to 0.9% C. A steel slab is austenitized and rolled into hot rolled strip which is cooled on a run-out table and then coiled.
The characterizing feature of the invention is that the hot rolling and the cooling of the strip on the run-out table are performed in such a manner that the austenite/ferrite transformation in the hot rolled strip starts only in the coil and is finished in the coil.
REFERENCES:
patent: 4397697 (1983-08-01), Freier et al.
patent: 4702778 (1987-10-01), Takahashi et al.
Patent Abstracts of Japan, Band 9, Nr. 211 (C-300) [1934], 29 Aug. 1985; & JP-A-60 77 921 (Shin Nippon Seitetsu K.K.) 02-05-1985.
Stahl und Eisen, Band 89, Nr. 15,24. Jul. 1979, pp. 815-824; H. W. Grasshoff: "Erfahrungen bei der Herstellung von Warm-und Kaltband aus Kohlenstroffreichen Stahlen mit Sorbitischen Gefugeanteilen", p. 819, Linke Spalte, Zeilen 34-46.
Patent Abstracts of Japan, Band 10, Nr. 214 (C-362) [2270], 25 Jul. 1986; & JP-A-61 52 317 (Kobe Steel Ltd) 15-03-1986.
Lang Cestmir
Meyer Lutz
Thyssen Stahl AG
Yee Deborah
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