Cold rolling method of ultrathin precise medium-width tinplate substrate of 0.05-0.1 mm with mirror surface light

Abstract

The invention discloses a cold rolling method of an ultrathin precise medium-width tinplate substrate of 0.05-0.1 mm with mirror-surface light. Tinplate raw material strip steel with a thickness of 1.8-2.5 mm is rolled to obtain a tinplate substrate with a final thickness (delta) of 0.05-0.1 mm; and the cold rolling method comprises the following steps: the primary rolling includes at most four passes; the total screw-down rate is 75-80%; the rolling force is 300-335 t; the raw material strip steel is finally rolled to reach 0.35 mm; in primary annealing, the annealing insulation temperature is 650-680 DEG C, and the insulation time is 12-14 hours; the secondary rolling includes at least three passes; the strip steel is rolled from the thickness of 0.35 mm to reach the final thickness (delta)+0.005 mm; the total screw-down rate is 75-77%; the rolling force is 190-210 t; the tension is 1.2-1.4 t; in secondary annealing, the degreasing and the wet leveling are omitted; the drawing and straightening are performed; the tinplate substrate finally reaches the thickness (delta) degrees-0.0015; the straightness is not more than 3 mm / m; the surface smoothness is 0.25-0.32 microns; the hardness HR30T is 51-54; and the weight of single coil is not more than 5 t.

Description

technical field [0001] The invention relates to the technical field of metal coils, in particular to a rolling method of 0.05-0.1mm ultra-thin steel strips. Background technique [0002] The tinplate substrate is plated with pure tin on both sides, and is widely used in canning, packaging, stamping containers and other industries. Since the advent of tinplate, the main development direction of metal container packaging materials, one is to use less tin, or even no tin, and use chrome-plated iron, and the other is to reduce the thickness of the tinplate substrate. The cost of the tank. For substrate thinning, secondary cold-rolled tinplate with enhanced hardness is the development direction of the can industry. For the same can shape, secondary cold-rolled tinplate can be used to replace the thickness with thinner, so as to improve the utilization rate of tinplate. [0003] The tinplate base plate in the prior art is generally rolled to a thickness of 0.19-0.5 mm. However,...

AI Technical Summary

Problems solved by technology

Faced with such product demand, most manufacturers cannot produce qualified products, and it is necessary to study a rolling method for ultra-thin precision medium-width tinplate substrates

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