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发明授权
CN108474084B 加工性优异的热轧镀覆钢板及其制造方法 有权

加工性优异的热轧镀覆钢板及其制造方法
摘要：
本发明公开热轧镀覆钢板及其制造方法，所述热轧镀覆钢板包括热轧钢板和形成在所述热轧钢板的表面的镀层，以重量％计，所述热轧钢板包含：C：0.03～0.06％、Mn：0.5～1.5％、Si：0.01～0.25％、Al：0.01～0.05％、P：0.001～0.02％、S：0.006％以下、Ti：0.0001～0.02％、Nb：0.0001～0.03％、N：0.001～0.005％、余量的Fe及不可避免的杂质，所述Ti、Al及N满足下述关系式1，所述Nb、C及N满足下述关系式2，并且所述热轧镀覆钢板具有小于4％的屈服点伸长。[关系式1]0.03≤(重量％Ti)×(重量％Al)×(重量％N)×106≤0.20，[关系式2]22≤(摩尔％Nb)/{(摩尔％C)×(摩尔％N)}≤1826(关系式1中的小括号分别表示对应元素的重量％值，关系式2中的小括号分别表示将对应元素的重量％除以对应元素的原子量的值)。
摘要（英）：

Disclosed are a hot-rolled coated steel sheet with an elongation at yield point of 4 % or less, comprising a hot-rolled steel sheet and a coat layer formed on the hot-rolled steel sheet, and a method for manufacturing the same. The hot-rolled steel sheet comprises, by weight, 0.03-0.06% of C, 0.5-1.5% of Mn, 0.01-0.25% of Si, 0.01-0.05% of Al, 0.001-0.02% of P, 0.006% or less of S, 0.0001-0.02% of Ti, 0.0001-0.03% of Nb, 0.001-0.005% of N, and a balance amount of Fe and inevitable impurities, wherein Ti, Al and N satisfy the following relational expression 1, and Nb, C and N satisfy the following relational expression 2: [Relational expression 1] 0.03≤(wt%Ti)×(wt%Al)×(wt%N)×106≤0.20; and [Relational expression 2] 22≤(mol%Nb)/{(mol%C)×(mol%N)}≤1826 (In relational expression 1, symbols within each pair of parentheses represent a wt % value of the corresponding element, and in relational expression 2, symbols within each pair of parentheses represent a quotient of a wt% of the corresponding element divided by an atomic weight of the element).

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