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介绍了高速铁路轨道板用高强度长材产品的种类及特点、开发过程关键工艺技术。通过合理Mn、Cr、B、Ti优化组合,自主设计了无砟CRTS1型板专用拉杆盘条的化学成分,满足了高铁设计的要求;精炼过程渣面避免采用硅铁粉的扩散脱氧,提高炉渣碱度的工艺,可以提高钢材的洁净度,w(T[O])控制在7×10-6～12×10-6;针对中碳高硅钢脱碳敏感性强的问题,开发了脱碳层控制技术,包括加热炉温度、时间、气氛以及轧后冷却制度的控制,将中碳高硅钢脱碳深度控制在小于1%钢材直径,无全脱碳;利用表层组织强化和析出强化来提高强度,同时轧材心部获得细小的铁素体+珠光体来保证材料的塑性,实现了高铁用精轧螺纹钢筋在高强度基础上的高塑性。
The types and features of high strength long products for high speed railway track plate are introduced. The key process technology in the development process is introduced. Through rational combination of Mn, Cr, B and Ti, the chemical composition of the special rod rod of CRTS1 plate is designed independently to meet the design requirements of high-speed railway. The refining slag surface avoids the diffusion and deoxidation of ferrosilicon powder, Alkalinity of the process, can improve the cleanliness of steel, w (T [O]) control in the 7 × 10-6 ~ 12 × 10-6; for carbon high silicon steel decarbonization sensitivity of the problem, the development of decarbonization Layer control technology, including the control of furnace temperature, time, atmosphere and cooling system after rolling, to control the depth of decarburization of medium-carbon high-silicon steel to less than 1% of the steel diameter without decarburization; to improve the surface structure and precipitation strengthening Strength, at the same time, the heart of the rolling material obtains the fine ferrite + pearlite to ensure the plasticity of the material, and realizes the high plasticity of the high-iron threaded steel on the basis of high strength.