| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.12 ( July 1985 ) Special Issue on Hot-and Cold-rolled Steel Sheets ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| A New Process for Manufacturing Deep-Drawing Cold-Rolled Steel Sheets from Extra-Low-Carbon Steels Susumu Satoh, Takashi Obara, Junsuke Takasaki, Akira Yasuda, Minoru Nishida |
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Synopsis : For developing a new process of manufacturing deep-drawing cold-rolled steel sheets, effects of chemical composition and hot-rolling conditions on mechanical properties of extra-low-carbon steel sheets have been investigated. The results obtained are given below: (1) In low C content less than 0.002%, resistance to aging can be obtained without overaging treatment in continuous annealing. However, improvement of deep-drawability by lowering C content is small because planar anisotropy of mechanical properties is extremely large. (2) A small addition of Ti or Nb effectively decreases the planar anisotropy and gives good deep-drawability. (3) Lowering a slab reheatig temperature below 1100 in such steels provides good deep-drawability even for hot-rolling with the finishing temperature below Ar3 and the coiling temperature below 600. This is noticeable in Ti-added extra-low-carbon steels. (4) On the basis of the above findings, a new process consisting of hot-rolling in the low temperature range and continuous annealing without overaging treatment using extra-low-carbon steels has been developed for producing deep-drawing cold-rolled steel sheets. |
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