连铸生产焊接气瓶钢中夹杂物

Non-Metallic Inclusions in Continuously Caststeel for Pressure Vessels

对转炉——ＲＨ真空处理一连铸生产焊接气瓶钢各个工艺阶段钢中非金属夹杂物的形 貌、尺寸、组成及来源等进行了系统的研究．结果发现钢包渣与钢液作用而生成的夹杂物在浇 注过程中可以从钢液中上浮去除，尺寸小于 ４０ μｍ的角状和蔟群状的 Ａｌ２Ｏ３夹杂物则难以完全 从钢液中排出而滞留在钢中，从而构成铸坯中非金属夹杂物的主要来源．铸坯中Ｔ［Ｏ］（１４－１６）Ｘ １０－６之间，非金属夹杂物含量为 ０．０９－０．１５ｍｇ／ｋｇ，表明所生产的铸坯具有较高的洁净度．

Non-metallic inclusions in the steel for pressure vessels produced through BOF-RH- Continuous Casting technological process were investigated systemically. The morphology, size, composition and origination of the inclusions were analyzed. It is concluded that the inclusions in the slabs are mainly small- sized angular alumina inclusions and alumina clusters (<40 μm), while the larger ones together with the resultants of reaction between ladle slag and molten steel were removed by floating out during casting. The total oxygen of the slab is in the range of (14-16) x 10-6 and the amount of the inclusions in the slabs changes from 0.09 -0. 15 mg/kg, Which indicate the high cleanliness of the slabs.