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发明公开
CN109778076A 低裂纹敏感性S550MC热轧汽车结构钢带的生产方法 无效 - 驳回

低裂纹敏感性S550MC热轧汽车结构钢带的生产方法
摘要：
本发明公开了一种低裂纹敏感性S550MC热轧汽车结构钢带的生产方法，所述生产方法包括转炉冶炼、LF精炼、板坯连铸、加热、粗轧、精轧、冷却、卷取工序。本发明通过低温控制轧制可以细化钢带晶粒，提高其综合性能；同时通过三段冷却，调整钢在相变过程中C的配分，避免珠光体转变组织转化，可以得到性能比铁素体珠光体更好的铁素体贝氏体组织，产品具有较高的抗拉强度和良好的扩孔率。本发明生产的钢带产品延伸率A：19.5～23%，0℃低温冲击功160～190J，扩孔率60～70%，适合冲压SUV、皮卡、轻卡等车型的结构件、加强件，具有制造工艺简单、成本低廉、扩孔率高的特点。
摘要（英）：

The invention discloses a production method of a low-crack-sensitivity hot-rolled S550MC structural steel strip for automobiles. The production method includes the steps of converter smelting, LF refining, slab continuous casting, heating, rough rolling, precision rolling, cooling and coiling. Through controlled rolling at low temperature, the production method can refine the grains of the steel strip to improve the comprehensive properties of the steel strip; meanwhile, through three stages of cooling, the partition of C in steel during the phase transition is adjusted to avoid pearlite transformation and structure conversion, so that a structure of ferrite and bainite, of which the properties are better than those of a structure of ferrite and pearlite, can be obtained; and the product has higher tensile strength and good hole expansion rate. The steel strip product produced by using the production method has the properties of percentage of elongation A being 19.5-23%, impact energyat low temperature 0 DEG C being 160-190 J and hole expansion rate being 60-70%, is suitable for the stamped structural parts and reinforcing parts of SUVs, pickup trucks, light trucks and other automobile types, and has the characteristics of simple manufacturing process, low cost and high hole expansion rate.

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