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发明公开
CN104694823A 一种超低碳高强韧性抗HIC管线钢板及其制备方法 有权

一种超低碳高强韧性抗HIC管线钢板及其制备方法
摘要：
本发明属于钢铁技术领域，具体地，本发明公开了一种超低碳高强韧性抗HIC管线钢板及其制备方法。所述钢板的化学成分及重量百分比含量包括：C：0.03％-0.05％、Si：0.15％-0.30％、Mn：≤1.20％、S：≤0.002％、P：≤0.010％、Nb：0.02％-0.08％、Ti：≤0.05％，其余为Fe和不可避免微量杂质。本发明通过低碳、高Nb含量微合金化、Ni合金化或Cr、Ni复合合金化成分设计，通过控制轧制与控制冷却工艺技术的实施，获得细小均匀的铁素体+少量退化珠光体组织类型的高强韧性抗HIC管线钢板。钢板不但具有高强度和高韧性，同时具有优良的抗HIC性能，十分适合用于制造含有酸性介质的石油、天然气输送管道。
摘要（英）：

The invention belongs to the technical field of steel, and particularly relates to an utralow-carbon high-strength, high-tenacity and HIC-resistant and a manufacturing method thereof. The steel plate comprises, by weight, 0.03%-0.05% of C, 0.15%-0.30% of Si, 1.20% of Mn or less, 0.02% of S or less, 0.10% of P or less, 0.02%-0.08% of Nb, 0.05% of Ti or less and the balance of Fe and inevitable trace impurities. Through the composition design of low carbon or high-Nb-content micro-alloying or Ni alloying or Cr and Ni composite alloying and the implementation of a controlled rolling technology and a controlled cooling technology, the high-strength, the high-strength, high-tenacity and HIC-resistant steel plate of the structure type with fine and even ferrites and a few of degenerated pearlites is obtained. The steel plate has high strength, high tenacity and good HIC resistance and is very suitable for manufacturing oil and natural gas pipelines with acid media.

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