An improved infinite chilled alloy cast iron steel roll casting method

Abstract

The invention relates to an improved casting method of an infinitely chilled alloy cast iron shaped steel roll. The chemical composition of the cast iron shaped steel rolled is calculated by weight percentage: C 3.00%-3.50%, Si 1.05%-1.65%, Mn 0.40%-0.80%, P<0.10%, S<0.03%, Ni 1.50%~2.00%, Cr 0.25%~0.65%, Mo 0.25%~0.65%; the rest is Fe and unavoidable impurities; After three inoculation treatments, the castings are annealed after unpacking to eliminate casting stress. The cast iron shaped steel roll of the invention has higher wear resistance and thermal crack resistance, thereby effectively improving the service life of the roll.

Description

technical field [0001] The invention relates to the technical field of roll manufacturing, in particular to an improved casting method for infinitely chilled alloy cast iron shaped steel rolls. Background technique [0002] Since the rolls for rolling profiled steel often need to have a deep pass, when most roll factories produce rolls for rolling large cast iron profiled steels, they usually use sand hanging on the inner wall of the cold profile, and the low-alloy molten iron is cast directly after being spheroidized by adding magnesium once. The pouring method can not only ensure the minimum hardness drop, but also prevent the roll from breaking or cracking under the action of chilling. However, due to the low alloy content, the slow cooling rate of molten iron, and the lack of good inoculation treatment, it often leads to shortcomings such as graphite and coarse carbides in the roll. [0003] In recent years, although there have been reports on the production and develop...

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Problems solved by technology

However, due to the low alloy content, the slow cooling rate of molten iron, and the lack of good inoculation treatment, it often leads to shortcomings such as graphite and coarse carbides in the roll.

[0003] In recent years, although there have been reports on the production and development of the improved infinite chilled alloy cast iron roll at home and abroad, it has not been implemented and popularized in actual production. At present, there is still a lack of an easy implementation that can guarantee a relatively Casting method of large section steel roll with high product qualification rate and excellent rolling performance

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