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CN108474057B 用于制造具有改善的延展性和可成形性的高强度钢板的方法和所获得的钢板 有权

用于制造具有改善的延展性和可成形性的高强度钢板的方法和所获得的钢板
摘要：
一种用于制造钢板的方法，所述方法包括以下顺序步骤：‑提供冷轧钢板，所述钢的化学组成以重量％计包含：0.15％≤C≤0.23％，1.4％≤Mn≤2.6％，0.6％≤Si≤1.5％，0.02％≤Al≤.0％，其中1.0％≤Si+Al≤2.0％，0≤Nb≤0.035％，0≤Mo≤0.3％，0≤Cr≤0.3％，剩余部分为Fe和不可避免的杂质；‑将所述钢板在Ac1至Ac3的退火温度TA下退火以获得包含至少40％的奥氏体和至少40％的亚温铁素体的组织；‑使所述板以至少20℃/秒的冷却速率从至少600℃的温度淬火至180℃至260℃的淬火温度QT；‑将所述板加热至375℃至470℃的配分温度PT，并将所述板保持在所述配分温度PT下25秒至440秒的配分时间Pt，如果所述配分温度PT为375℃至400℃，则所述配分时间Pt为100秒至440秒，而如果所述配分温度PT为450℃至470℃，则所述配分时间Pt为25秒至150秒；‑将所述板冷却至室温，所述钢板具有以面积分数计由以下组成的最终显微组织：‑至少11％的回火马氏体，‑10％至20％的残余奥氏体，‑40％至60％的铁素体，‑至多6％的新鲜马氏体，‑至多18％的贝氏体。
摘要（英）：

A method for producing a steel sheet is provided. The method includes providing a cold-rolled steel sheet including in weight %: 0.15%≤C≤0.23%, 1.4%≤Mn≤2.6%, 0.6%≤Si≤1.5%, 0.02%≤Al≤1.0%, with 1.0%≤Si+Al≤2.0%, 0≤Nb≤0.035%, 0≤Mo≤0.3%, 0≤Cr≤0.3%, and a remainder of Fe and unavoidable impurities, annealing the steel sheet at an annealing temperature between Ac1 and Ac3 to obtaining at least 40% austenite and at least 40% intercritical ferrite, quenching the sheet from at least 600° C. at a cooling rate of at least 20° C./s to a quenching temperature between 180° C. and 260° C., heating the sheet to a partitioning temperature between 375° C. and 470° C. and maintaining the sheet at this partitioning temperature for a partitioning time Pt between 25 s and 440 s, then cooling the sheet to room temperature. A steel sheet is also provided.

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