| 摘要 |
Taught is a method for producing 700 MPa high strength weathering steel, comprising employing a thin slab casting and rolling technology, comprising (a) smelting at a charging temperature to produce molten steel, (b) refining said molten steel at a tapping temperature, (c) thin slab continuous casting of a casting billet, (d) soaking of said casting billet, (e) hot continuous rolling of said casting billet at a finishing temperature, (f) laminar cooling of said casting billet, and (g) coiling of said casting billet at a coiling temperature, wherein C is present in the molten steel in the range of from 0.03 to 0.07 percent by weight; Si is present in the molten steel in the range of from 0.3 to 0.5 percent by weight; Mn is present in the molten steel in the range of from 0.6 to 1.6 percent by weight; P is present in the molten steel in the range of less or equal to 0.04 percent by weight; S is present in the molten steel in the range of less or equal to 0.008 percent by weight; Cu is present in the molten steel in the range of from 0.2 to 0.5 percent by weight; Cr is present in the molten steel in the range of from 0.3 to 0.7 percent by weight; Ni is present in the molten steel in the range of from 0.15 to 0.35 percent by weight; Ti is present in the molten steel in the range of from 0.08 to 0.14 percent by weight; Al is present in the molten steel in the range of from 0.025 to 0.05 percent by weight; N is present in the molten steel in the range of less or equal to 0.008 percent by weight, the charging temperature is 950-1100° C., the tapping temperature is 1100-1180° C., the finishing temperature is 870-920° C., and the coiling temperature is 550-650° C.
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