ABSTRACT Interstitial free (IF) grade steels have high transformation temperatures and often results in non-uniform rolling and lower yields. In the present work, industrial ferritic rolling process is developed, where finish rolling is carried out below the Ar1 temperature for the IF grade steel. Offline simulation was carried out using a hot strip mill model (HSMM) software and full-scale ferritic rolling was carried out in a seven-stand hot strip mill under two different finishing and coiling temperatures and compared with austenitic rolling. Furnace drop-out temperature, mill speed and inter-stand cooling were controlled to achieve the desired low rolling temperatures. Both ferritic rolled coils had strained elongated grains and well-developed alpha (<110>//RD) and gamma (<111>//ND) textures. The lower finishing and coiling temperature processed coil shows higher microstructural and textural variation along with the thickness. This work established the optimum parameters for the industrial ferritic rolling process for IF grade steel.

中文翻译：

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IF级钢工业铁素体轧制工艺的开发

摘要 无间隙 (IF) 级钢具有高转变温度，通常会导致轧制不均匀和产量降低。在目前的工作中，开发了工业铁素体轧制工艺，其中对 IF 级钢在低于 Ar1 温度的温度下进行精轧。使用热轧机模型 (HSMM) 软件进行离线模拟，并在七机架热轧机上在两种不同的精轧和卷取温度下进行全尺寸铁素体轧制，并与奥氏体轧制进行比较。控制出炉温度、轧机速度和机架间冷却以达到所需的低轧制温度。两种铁素体轧制卷材均具有应变细长晶粒和发育良好的 alpha (<110>//RD) 和 gamma (<111>//ND) 织构。较低的整理和卷取温度处理的卷显示出更高的微观结构和纹理随厚度的变化。这项工作确定了 IF 级钢工业铁素体轧制工艺的最佳参数。