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一、引言钢中氧化物夹杂按其大小,大体上可分为显微夹杂和>50μm的大颗粒夹杂。由于非金属夹杂物的存在破坏了钢的连续性,使钢材的机械性能大幅度降低,危害甚大;影响了超声波探仿合格率,直接关系着成材率的提高。所以对这类夹杂的研究日益引起人们的重视。研究表明,钢中的大型氧化物夹杂,一般数量较少、呈不均匀分布。近年来,钢包——中间包——结晶器的各种保护浇注工艺,已广泛用于连铸生产过程,这对提高钢的清洁度是十分有效的。但小方坯连铸机由于断面小,一般又采用敝开浇注,其铸坯清洁度的状况会是怎样?为了回答人们所关心的这个问题,我们进行了专
First, the introduction of oxide inclusions in steel according to their size, in general, can be divided into micro-inclusions and large particles inclusions> 50μm. Because of the existence of non-metallic inclusions destroyed the continuity of the steel, so that the mechanical properties of steel significantly reduced, endangering; affect the ultrasonic qualification rate, directly related to the improvement of the finished product rate. Therefore, the study of such inclusions is drawing more and more attention. Studies have shown that large inclusions of oxides in steel are generally small in number and are unevenly distributed. In recent years, ladle - tundish - a variety of casting mold protection casting process, has been widely used in continuous casting production process, which is to improve the cleanliness of steel is very effective. However, the small billet caster due to the small cross section, usually with open pouring, the condition of the slab cleanliness will be like? In answer to people are concerned about this issue, we conducted a special