Method for the manufacture of steel suitable for electric-welded

Details Method for the manufacture of steel suitable for electric-welded Method for the manufacture of steel suitable for electric-welded

1981-08-31

1983-06-14

Skiff, Peter K.

Metal treatment

Compositions

Heat treating

148 124, 148 36, C21D 802

Patent

active

043881238

ABSTRACT:
A steel stock consisting, in basic composition, of C.ltoreq.0.12%, 0.5-1.0% Mn, 0.10-0.25% Si, P.ltoreq.0.015%, S.ltoreq.0.0020%, Nb.ltoreq.0.050%, 0.0010-0.0060% Ca and the remainder of Fe and negligible traces of impurities is hot rolled, this hot rolling being finished at a temperature above 870.degree. C. The steel is then rapidly cooled on a runout table at an average cooling rate of from 5.degree. C. to 30.degree. C. per second, and finally, the steel is coiled at a temperature below 570.degree. C. The steel stock has superior resistance to sour gas.

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patent: 4153454 (1979-05-01), Emi et al.
patent: 4184898 (1980-01-01), Ouchi et al.
Hamre et al., "Properties of Acicular-Ferrite Steel for Large-Diameter Line Pipe," Micro Alloying 75, Conference in Wash., DC, Oct. 1975, Session 2B, pp. 21-27.
Krishnadev et al., "Low-Temperature Mechanical Behavior of an `Acicular` Ferrite HSLA Line Pipe Steel," Met. Trans. A, vol. 10A, Dec. 1979, pp. 1941-1944.
Grozier, "Production of Micro Alloyed Strip and Plate by Controlled Cooling," Micro-Alloying 75, Session 2A, Oct. 1-3, 1975, Wash., DC, pp. 23-32.
Pircher et al., "Controlling Inclusions in Steel by Injecting Calcium into the Ladle," Micro Alloying 75, Session 2A, Oct. 1-3, 1975, Wash., DC, pp. 15-22.

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