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38CrMoAlA钢材上,出现的低倍点状偏析,是C、S、P元素的正偏析,和以铝元素的负偏析的集合体,是区域偏析的一种。试验数据指出:在电弧炉冶炼和模铸条件下,38CrMoAlA钢点状偏析的形成,和钢锭结晶条件有密切关系,只要从生产工艺上,控制适当的钢液的过热度,缩小液固两相线的温差,缩短液固二相共存区存在的时间,创造良好的结晶条件,限制柱状晶体的发展,可以有效地解决165～170园方大尺寸钢材上的低倍点状偏析质量问题。
On the 38CrMoAlA steel, the occurrence of low point-like segregation is a positive segregation of C, S, P elements and a negative segregation of aluminum elements, which is a kind of regional segregation. According to the experimental data, the formation of point segregation of 38CrMoAlA steel is closely related to the ingot crystallization condition under the conditions of electric arc furnace smelting and die-casting. As long as the superheat of the proper molten steel is controlled from the production process, the liquid-solid two phase The temperature difference between the two lines can shorten the time of existence of liquid-solid two-phase coexistence zone, create good crystallization conditions and limit the development of columnar crystals, which can effectively solve the problem of low magnification segregation quality on the large scale steel of 165-170 Yuan.