High-strength cold-rolled steel sheet excellent in coating film adhesion
a cold-rolled steel sheet, excellent technology, applied in the direction of heat treatment apparatus, furnaces, manufacturing tools, etc., can solve the problems of poor chemical treatability of steel sheets, cracks, adverse affecting ductility, etc., to achieve good chemical treatability, good weldability, good strength
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[0090] The invention will be described in more detail with reference to the following examples, which are not intended to restrict the scope thereof, and various changes and modifications may be made in the invention without departing from the spirit and scope thereof.
[0091] In each example, a steel with the chemical composition shown in Table 1 was prepared by melting, and the resulting steel was cast into a slab, which underwent hot rolling, followed by pickling. Winding and pickling were performed under the conditions shown in Tables 2 and 3. Pickling involved an aqueous solution of hydrochloric acid (1 to 18 mass %) at 70 to 90° C. Pickling was followed by cold rolling, which gave a 1.4 mm thick steel sheet.
[0092] The steel sheet underwent continuous annealing by either of the processes shown in FIGS. 2 and 3. The process shown in FIG. 2 involves cooling with water quenching (WQ) that follows soaking and slow cooling. The process shown in FIG. 3 involves cooling with mist, gas...
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Abstract
- [0001]
- (I) In the surface of the steel sheet, there exist Si—Mn complex oxides no larger than 5 μm in diameter of the equivalent circle as many as 10 or more per 100 μm2 and the coverage of oxides composed mainly of Si on the surface of steel sheet is no more than 10% of surface area, and/or (II) The cross section near the surface of the steel sheet does not show cracks with a width no larger than 3 μm and a depth no smaller than 5 μm in arbitrary ten fields of observation under an SEM with a magnification of 2000. A high-strength cold-rolled steel sheet excellent in coating film adhesion and having a tensile strength no lower than 550 MPa is provided.
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