ABSTRACT

When producing cold-rolled steel sheets, the penultimate annealing process is followed by a final skin-pass rolling (or temper rolling) whose purpose is to eliminate any discontinuous yielding which creates stretcher–strain markings when the steel sheets are formed. To find out the critical reduction ratio eliminating the discontinuous yield phenomenon, the samples were annealed at 820°C for 3 min and then subjected to the temper rolling at various thickness reductions at room temperature. Results showed that the discontinuous yield phenomenon could not be eliminated in the case of a thickness reduction less than 0.5%, that a certain reduction ratio should be exceeded to eliminate the discontinuous yielding, and that the aging time varied depending on the reduction ratio. In addition, while the low-carbon steels did not undergo strain aging in three months with a 1% thickness reduction, they underwent strain aging in at least four months with higher thickness reductions.

摘要

在生产冷轧钢板时，倒数第二个退火过程之后是最终的表面光整轧制（或平整轧制），其目的是消除任何不连续的屈服，这些不连续屈服会在钢板成型时产生拉伸应变标记。为了找出消除不连续屈服现象的临界压下率，将样品在 820°C 下退火 3 分钟，然后在室温下以各种厚度压下率进行平整轧制。结果表明，在厚度压下量小于0.5%的情况下，不连续屈服现象无法消除，需要超过一定的压下率才能消除不连续屈服，时效时间因压下率而异。此外，