| 摘要 |
Provided is an alloying molten zinc-plated steel sheet with high strength and excellent deep drawability as well as excellent slab cracking resistance and secondary working embrittlement resistance. The base steel sheet for this alloying molten zinc-plated steel sheet contains, in mass%, C: 0.0080% or less, Si: 0.7% or less, Mn: 1.0-2.5%, P: greater than 0.030-0.048%, S: 0.025% or less, Al: 0.005-0.20%, N: 0.010% or less, Ti: 0.005-0.040%, Nb: 0.005-0.060%, and B: 0.0005-0.0030%, the balance being obtained from Fe and impurities, and has a chemical composition that satisfies expression (1) - expression (4). The alloying molten zinc-plating layer contains 7-15 mass% Fe. 25 × P + 4 × Si ≤ 3.6 (1) B−X1 ≥ 0.0005 (2) C−(12/93) × Nb − X2 ≥ −0.0035 (3) 110 × Si + 48 × Mn + 550 × P ≥ 120 (4) |
