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国内一些小型钢厂用20~#钢小钢锭直接轧制钢管时,表面产生裂纹的现象很严重。包钢的20~#钢管是由管坯轧制,表面裂纹不明显,但在钢坯上时有发生,其产生的原因长期未决。 20~#钢表面裂纹敏感性是多年来国内外许多人都在研究的问题。近几年在国内金相会议上对20~#钢表面裂纹的问题也进行了几次讨论,初步认为20~#钢表面的缺陷是导致表面裂纹的主要原因之一。这些表面缺陷,如皮下气泡,夹杂和凹坑等,在加热时氧化,轧制中受力开裂。我们过去的许多检验
Some domestic small mills with 20 ~ # small steel ingot direct rolling steel, the surface cracks are very serious. Baotou 20 # steel pipe is rolled by the tube, the surface cracks are not obvious, but sometimes occur on the billet, the reasons for its long-pending. 20 ~ # steel surface crack sensitivity over the years many people are studying the issue. In recent years, the domestic metallurgical conference on the 20 ~ # steel surface cracks have also been discussed several times, initially that 20 ~ # steel surface defects is one of the main causes of surface cracks. These surface defects, such as subcutaneous bubbles, inclusions and pits, etc., in the heating oxidation, rolling stress cracking. Many of our past tests