前言本文阐述大冶钢厂和武钢生产中遇到的一种类型的钢锭表面裂,这种缺陷产生于红送钢锭的表面,轧制后在钢坯上形成裂纹,也有时在钢材上发现。 1960年前后电炉钢红送初轧出现大量红送裂废品,发现这种缺陷与钢锭的传搁时间(即浇铸完毕到开始装炉的间隔时间)有关,为此,曾制定了红送制度,严格控制传搁时间,比较有效的防止了红送裂。 1970年以后发现电炉钢冷送产生热应力内裂的问题很突出,有必要扩大红送;因此,在前一阶段工作的基础上又进行了试验。找到了红送裂敏感性的原因,是钢中含有较高的酸溶铝和氮引起的。找出了传搁时间对红送裂严重程度的一般规律:装炉前钢锭表面温度略高于Ar_1红送裂最严重,对于裂敏感钢应控制传搁时间,避开此温度。对于平 Preface This article describes a type of ingot surface crack encountered in Daye Steel and WISCO production. This defect occurs on the surface of the red ingot. Crazing occurs on the billet after rolling and is sometimes found on steel. In 1960, a large amount of red scrap was produced in the red-hot rolling of the electric furnace. It was found that this defect was related to the transfer time of the ingot (that is, the interval between the start of casting and the completion of casting). For this reason, Strict control of transfer time, more effectively prevent the red crack. After 1970, it was discovered that the issue of cold cracking of electric furnace steel caused by thermal stress was prominent and it was necessary to expand the red tape; therefore, experiments were conducted on the basis of the previous stage of work. The reason for the sensitivity of the red fissure was found to be caused by the higher acid-soluble aluminum and nitrogen in the steel. The general rule of the severity of the red crack was found. The surface temperature of the ingot before loading was slightly higher than that of the Ar_1 red fissure, and the crack propagation time should be controlled to avoid the temperature. For the flat