《Table 2 The cooling types, coiling temperatures, and cooling rates of the samples》

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《The effect of cooling rate and coiling temperature on the microstructure and mechanical properties of a plain carbon steel》

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The material w as produced by a 50 kg vacuum induction furnace and cast into a small ingot follow ed by forged and cut into 25 mm×200 mm×200mm square billets.The chemical composition is listed in Table 1.These billets w ere heated to1 100℃，held for 1 h，and then rolled to 8 mm thick flats through three rolling passes on the laboratory rolling mill w ith opening and finish rolling temperatures of 1 020 and 850℃，respectively.After rolling，separate flats w ere cooled to580℃through three different cooling processes，IC，LC，and UFC，and then held in the furnace for1 h to simulate the coiling process before final air cooling to room temperature.In addition，to analyze and compare the influence of different coiling temperatures on microstructure and properties in the case of same UFC process，the specimen w as cooled to 500℃through UFC and held for 1 h follow ed by air cooling to room temperature.The finish rolling temperature，cooling type，coiling temperature and cooling rate of the samples are show n in Table 2，and the final metallographic specimens w ere made from the room temperature samples.After grinding，polishing，and corrosion in 4%Nital solution，the microstructure w as observed and determined using a ZEISS optical microscope.