Abstract
In order to make a comprehensive comparison between ultra-thin hot rolled low carbon steel (LC) and extra low carbon steel (ELC) produced by endless roll technology and explain the differences, a detailed investigation into the microstructural characterization, characteristics of cementite and precipitates, mechanical properties, internal friction peaks, texture characterization by an X-ray powder diffractometer and electron backscatter diffraction, and formability including earing behavior, hole expanding ratio and V-shaped bending properties was carried out with different carbon content for 1.0 mm thickness ultra-thin hot rolled strip produced in endless strip production line. The experimental results indicate that the microstructure of both is composed of multi-layer areas with different grain sizes and thicknesses, the strength and elongation of LC are higher than that of ELC, but the content of solid solution carbon atoms and r of ELC are higher than that of LC, at the same time, the formability of ultra-thin strip ELC is better than that of LC mainly related to the content of {hkl} <110> and {111} <112> of ELC was higher than those of LC. The mechanical and formability properties of ultra-thin hot rolled strip by endless roll technology can meet the requirements of replacement cold rolled strip by hot rolled strip.
Highlights
The market of flat steels is changing on the one hand to lower average thicknesses and advanced steel design [1] and on the other hand it needs more high-quality and low-cost green products
K is recommended to be1.33
The 1.0 mm thickness ultra-thin hot rolled strip produced by endless roll technology was studied, and a detailed investigation of the microstructural characterization
Summary
The market of flat steels is changing on the one hand to lower average thicknesses and advanced steel design [1] and on the other hand it needs more high-quality and low-cost green products. Endless rolling technology is a new short process endless rolling thin and wide strip steel production technology in recent years. It plays a leading and exemplary role in low cost, energy conservation and emission reduction and green manufacturing because it has the characteristics of short process, near net shape and endless rolling production. Endless strip production (ESP) is the most advanced endless rolling technology in the world today and has been honored as the third technological revolution in steel industry [2] marked a new era of mass production of thin gauge (thickness ≤ 2.0 mm) and ultra-thin gauge (thickness ≤ 1.5 mm) hot rolled production.
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