Hard tinned original plate with thin specification and manufacture method thereof

Abstract

The invention provides a hard tinned original plate with a thin specification and a manufacture method thereof, wherein the original plate comprises components of C 0.095%-0.130%, Si <= 0.020%, Mn 0.25%-0.40%, P <=0.015%, S <=0.015%, Als 0.015%-0.055%, Ti 0.005%-0.020%, N <= 0.003% and the balance being Fe. The method comprises smelting, continuous casting, hot rolling, acid pickling, cold rolling, electrolytic degreasing, full hydrogen cover annealing and flattening. The size of nonmetallic inclusions in steel after smelting is smaller than 10 [mu]m and lower than 0.04 unit/m2. Zero defect continuous casting is adopted. The heating temperature of hot rolling slabs is 1190-1250 DEG C and the heating time thereof is no shorter than 200 minutes, and the rough rolling temperature, finish rolling temperature and coiling temperature are 1030-1090 DEG C, 860-900 DEG C and 540-600 DEG C respectively. A CVC rolling mill is used in cold rolling, the total reduction rate being 86%-93%. The annealing temperature is no higher than 560 DEG C and the annealing time is no shorter than 12 hours. The flattening elongation percentage is 1.5%-2.0%. The alloy of the invention has low cost, small and few nonmetallic inclusions, excellent stamping performance, high product hardness value and small thickness.

Description

technical field [0001] The invention belongs to the field of iron and steel smelting materials, and relates to a thin hard tinned original plate for making rigid can bodies and bottle caps and a manufacturing method thereof, in particular to a tinned original plate with a hardness HR30Tm within 61±3 and a manufacturing method thereof. Background technique [0002] Tin plate is an important raw material for making various food cans, bottle caps and chemical products and other packaging containers. It requires high strength, good formability, excellent corrosion resistance, strong weldability, bright appearance and good printing and coloring properties. A product with strong production technology, long manufacturing process, high quality requirements and difficult manufacturing. The key technologies of the quality control of tin-plated raw plates are mainly reflected in the following four aspects: composition and performance control, thickness accuracy, plate shape accuracy an...

AI Technical Summary

Problems solved by technology

[0012] In short, in the existing technology, either the C content in the composition is low, the hardness value is low, or the specification is too thick, or the continuous annealing method is adopted, the stamping performance is deviated and it is easy to cause the failure of the plate, or the rolling technology used is slightly insufficient. , it is difficult to meet the increasingly stringent precision requirements for high-quality tinplate

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