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焊接结构中出现的层状撕裂,业已证明与钢板厚度方向上的性能也有关系。抗拉强度为41～60公斤/毫米~2的铝镇静优质钢板,其厚度上的延性,在很大程度上取决于非金属夹杂物(主要是MnS)的数量和长度,尤其是取决于这些夹杂物的聚集程度。通过厚度方向上的拉力试验,便能可靠地检验出厚度上的延性。可以采用这些试验方法,来进行检验层状撕裂倾向。下面将叙述这些方法。厚度上的延性与超声波检验结果之间的关系,尽管可靠性不大,但也将进行讨论。而且,将对炼钢生产中一些重要的因素的影响加以讨论,这些因素如S含量的影响,如目的在使夹杂物形状变短的元素,如Zr的影响以及在盛钢桶内的H_2含量的影响,这种H_2含量被证实是对夹杂物的聚集程度有影响的。通过上述知识在炼钢实践中的应用,本文拟对出现过层状撕裂并成功予以消除的那些结构,列举若干实例。
Layered tears appearing in welded structures have also been shown to be related to the properties of the sheet in the thickness direction. The quality of ductile sheets of aluminum-calmed high-quality steel with a tensile strength of 41-60 kg / mm2 depends strongly on the number and length of non-metallic inclusions (mainly MnS) and, in particular, on these Inclusion of the degree of inclusion. Through the tensile test in the thickness direction, the ductility in thickness can be reliably checked. These test methods can be used to verify the tendency of lamellar tearing. These methods will be described below. The relationship between the ductility on the thickness and the ultrasonic test results will be discussed, although less reliable. Moreover, the impact of some important factors in steelmaking, such as the effect of S content, such as the effect of elements such as Zr, which aim to shorten the inclusion shape, and the H 2 content in the ladle, The H 2 content has been shown to affect the degree of inclusion aggregation. Through the application of the above knowledge in the practice of steel-making, this paper intends to give some examples of those structures that have been successfully layered lamellae and have been eliminated.