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本文对CK67(相当于65Mn)进口冷轧带钢(合格料)以及进口热轧坯经我国冷轧后带钢(不合格料)按规定的工艺热处理,再经试验分析以探讨用进口CK67热轧坯经冷轧后生产的锯条产生爆裂的原因。结果表明:由于进口坯料中P的含量偏高,有的超过技术条件所规定的范围,又As的含量也偏高,这二个元素都能降低C在α—Fe中的溶解度,造成碳化物富集于晶界,再由于P和Mn之间有着较强的吸引力,相互促进向晶界偏聚,降低了原奥氏体晶界的强度,引起锯条产生沿晶断裂而失效。 同时通过试验指出对含P量较高,但未超出技术条件的坯料,在冷轧后采用延长回火保温时间的措施,仍能保证产品达到出厂标准。
In this paper, CK67 (equivalent to 65Mn) imported cold-rolled strip (qualified material) and the imported hot-rolled billets after China’s cold-rolled strip (unqualified material) according to the provisions of the heat treatment, and then through the test analysis to explore the imported CK67 heat Billets produced by the cold-rolled saw blade produces a burst of reasons. The results show that due to the high content of P in the imported billets, some of them exceed the range specified in the technical conditions and the content of As is also high, both of these elements can reduce the solubility of C in α-Fe, resulting in carbides Enriched in the grain boundaries, and then due to P and Mn have a strong attraction between each other to promote segregation to the grain boundaries, reducing the strength of the original austenite grain boundaries, causing blade failure along the crystal fracture. At the same time, it is pointed out through experiments that for the billets with high P content but not exceeding the technical conditions, the measures of prolonging the tempering holding time after cold rolling can still ensure that the products meet the factory standards.