Retarded aging, rimmed steel with good surface quality

Details Retarded aging, rimmed steel with good surface quality Retarded aging, rimmed steel with good surface quality

B - Operations, Transporting

23

K

13/13, 22/183, 8

B23K 3/00 (2006.01) B22D 19/08 (2006.01) B22D 37/00 (2006.01) B22D 39/00 (2006.01)

Patent

CA 1170006

ABSTRACT OF THE DISCLOSURE A rimmed steel product, in-hot-rolled or cold rolled and annealed form, is made essentially non-aging by inclusion of one or both of the aggng-retardant ele- ments vanadium and boron, while retaining an excellent, clear surface that is not severely affected by the pre- sence of such element or elements. To produce such articles, an ingot mold is poured 80 to 95% full of plain rimming steel, and the molten steel is allowed to rim, e.g. for several minutes, until a rimmed shell solidifies against the mold wall. Then pouring is completed with the same steel, while adding one or both of the aging-retardant elements to the teemed stream. Processed like rimmed steel, ultimate rolled (e.g. strip) products having a thin, truly rimmed skin over a main body of substantially non-aging steel, are found to exhibit no unwanted change of properties (e.g. as would be revealed by significant strain lines) such as usually characterizes the effect of aging in rimmed steel. There is some advantage in using the two elements together, or in the simultaneous inclusion of other, strength-promoting elements such as Cb, Zr, Si, and it has been noted that tensile properties are enhanced when V is added, as above, for aging-retardant function.

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