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CN104328339A 一种钒氮复合微合金化高强度压力容器钢板及制备方法 无效 - 撤回

一种钒氮复合微合金化高强度压力容器钢板及制备方法
摘要：
一种钒氮复合微合金化高强度压力容器钢板及制备方法，属于压力容器用钢板生产技术领域。钢的成分wt％为：碳：0.12～0.20％；硅：0.20～0.40％；锰：1.2～1.8％；硫：≤0.010％；磷：≤0.015％；钼：0.40～0.60％；钒：0.05～0.25％；氮：0.010～0.030％，其余为铁和不可避免的杂质。本发明在传统压力容器钢18MnMoNb的基础上，用钒、氮复合添加取代铌元素，通过促进形成针状铁素体细化组织来改善钢的力学性能，尤其是提高韧性。冶炼、连铸符合成分要求的铸坯，经过热轧制备出力学性能优良的压力容器钢板，最终力学性能满足：屈服强度≥550MPa，抗拉强度≥800MPa，延伸率≥20％，夏比冲击功KV20℃≥70J。
摘要（英）：

The invention relates to a vanadium nitrogen composite micro-alloy high-strength pressure vessel steel plate and a preparation method and belongs to the technical field of production of steel plates for pressure vessels. The steel is prepared from the following components in percentage by weight: 0.12-0.20% of carbon, 0.20-0.40% of silicon, 1.2-1.8% of manganese, less than or equal to 0.010% of sulfur, less than or equal to 0.015% of phosphorus, 0.40-0.60% of molybdenum, 0.05-0.25% of vanadium, 0.010-0.030% of nitrogen and the balance of iron and inevitable impurities. Based on conventional pressure vessel steel 18MnMoNb, vanadium and nitrogen are compositely added to replace niobium and the mechanical property, particularly toughness, of the steel is improved by promoting formation of refined tissues of an acicular ferrite. Casting blanks which meet the component request are smelted and casted continuously and the pressure vessel steel plate with excellent mechanical property is prepared by hot rolling. Finally, the mechanical property meets the following conditions: the yield strength is greater than or equal to 550MPa, the tensile strength is greater than or equal to 800MPa, the ductility is greater than or equal to 20% and the Charp impact value KV(20 DEG C) is greater than or equal to 70J.

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