| 摘要 |
<p>A process for the production of low carbon steel strips having a good combination of strength an formability, as cast, and a good weldability after the pickling by usual processes, comprising the following steps: casting, in a twin rolls continuous casting machine (1) comprising pinch rolls (3), a strip with a thickness comprised between 1 and 8 mm, having the following composition as weight percentage of the total weight: C 0.02-0.10; Mn 0.1-0.6; Si 0.02-0.35; Al 0.01-0.05; S∫0.015; P∫0.02; Cr 0.05-0.35; Ni 0.05-0.3; N 0.003-0.012; and, optionally, Ti∫0.03; V∫0.10; Nb∫0.035, the remaining part being substantially Fe; cooling the strip in the area comprised between the casting-rolls and the pinch rolls (3); hot deforming the strip cast through said pinch rolls (3) at a temperature comprised between 1000 and 1300 °C until reaching a thickness reduction less than 15 %, in order to encourage the closing of the shrinkage porosities; cooling the strip at a speed comprised between 5 and 80 °C/s down to a temperature (Tavv) comprised between 500 and 850 °C; and coiling into a reel (5) the so obtainable strip.</p> |
