| 摘要 |
PROBLEM TO BE SOLVED: To provide a thin of galvanized soft steel sheet with a sheet thickness of <=2.6 mm having tensile strength of <=340 MPa and having excellent formability, and to provide its production method. SOLUTION: A steel slab having a composition containing <=0.0040% C, 0.6 to 1.50% Mn, <=0.150% Al and Si, P, S and N so as to be controlled and further containing Ti: (48/14)N(%)+0.002} to 6×(48/12))C(%)+(48/14)N(%)}% is heated to SRT of >=1,000 deg.C, is hot-rolled so as to control FDT to 800 to 950 deg.C, is coiled at CT of 450 to 800 deg.C, is pickled and is thereafter subjected to heating treatment and galvanizing treatment. Alloying treatment may be performed in succession to the galvanizing treatment. Continuous annealing treatment may be performed before the heating treatment.
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