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Manufacturing method for second cold-rolled tin-plated steel sheet of highly anti-sulfur food can

A technology for secondary cold-rolled and tin-plated steel sheets, applied in the direction of chromate treatment, etc., can solve the problems of difficult industrial production of secondary cold-rolled and tin-plated steel sheets.

Inactive Publication Date: 2017-08-29
SHOUGANG JINGTANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention solves the difficulty in industrial production of secondary cold-rolled tin-plated steel sheets used for canning protein-containing foods and beverages in the prior art by providing a method for manufacturing high-sulfur-resistant food cans. To solve the technical problems, realize the industrialized manufacturing of secondary cold-rolled tin-plated steel plates for canned food and beverages containing protein

Method used

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  • Manufacturing method for second cold-rolled tin-plated steel sheet of highly anti-sulfur food can

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] This embodiment provides a method for manufacturing a secondary cold-rolled tin-plated steel plate used for high sulfur-resistant food cans. Washing, electro-tinning, reflow, passivation, oiling, coiling to get the finished product. The yield strength of the secondary cold-rolled tin-plated substrate is 510MPa, the elongation is 6.5%, the hardness HR30T is 70, the roughness of the upper surface is 0.32μm, and the roughness of the lower surface is 0.33. The secondary cold-rolled tin-plated substrate is subjected to alkali cleaning, pickling, tinning, and reflow, and then passivated according to the method of the present invention, and then rinsed with desalted water, dried, oiled, and coiled to obtain a secondary Finished cold-rolled tinplate. Among them, the control passivation current density is 2.5As / dm 2 ; control Na 2 Cr 2 o 7 The concentration is 25.10g / L, Na 2 Cr 2 o 7 The purity is 99.5%; the passivation temperature is controlled at 42.7°C, and the passiv...

Embodiment 2

[0035] The difference between the manufacturing method of the secondary cold-rolled tin-plated steel plate used for high sulfur-resistant food cans provided in this example and Example 1 is only that: in this example, the passivation current density is controlled to be 3.0As / dm 2 . After testing, the anti-sulfur grade of the secondary cold-rolled tin-plated steel plate is Class I.

Embodiment 3

[0037] The difference between the manufacturing method of the secondary cold-rolled tin-plated steel sheet for high sulfur-resistant food cans provided in this example and Example 2 is that in this example, the passivation current density is controlled to be 3.5As / dm 2 . After testing, the anti-sulfur grade of the secondary cold-rolled tin-plated steel plate is Class I.

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Abstract

The invention relates to the technical field of metal processing, in particular to a manufacturing method for a second cold-rolled tin-plated steel sheet of a highly anti-sulfur food can. The method comprises the steps: enabling a second cold-rolled tin-plated base plate with a thickness of 0.11 to 0.17mm to be subjected to alkali washing, acid pickling, electrolytic tinning, soft melting, passivating, oil spraying and coiling to obtain a finished product; control passivation current density to be 2.5 to 3.5As / dm<2>; adopting sodium dichromate to conduct a passivation reaction, and controlling the concentration of sodium chromate to be 22g / L to 30g / L; controlling the passivation temperature to be 40 to 46 DEG C; and controlling the passivation pH to be 4.1 to 4.7. The manufacturing method for the second cold-rolled tin-plated steel sheet of the highly anti-sulfur food can provided by the invention is able to prepare the second cold-rolled tin-plated steel sheet of the highly anti-sulfur food can, yield strength of the second cold-rolled tin-plated steel sheet is 470 to 600MPa, the elongation is more than or equal to 4%, the hardness HR30T is 68 to 78, the surface roughness is 0.30 to 0.60mu m, and the sulfur resistance is less than or equal to 2 level.

Description

technical field [0001] The invention relates to the technical field of metal processing, in particular to a method for manufacturing a secondary cold-rolled tinned steel plate of a high-sulfur-resistant food can. Background technique [0002] With the continuous emergence of new packaging materials, tinplate as a food container packaging material is facing great market competition pressure. In order to reduce manufacturing costs, the thickness of tinplate products used by users has changed from the original 0.20-0.22mm It started to turn to less than 0.20 mm, and the secondary cold-rolled products can further reduce the thickness of the strip after the primary cold rolling and annealing. At present, there are 0.11-0.17 mm secondary cold-rolled tinplate products. At the same time, users have also put forward higher and higher requirements for secondary cold-rolled tinplate products. Especially the sulfidation corrosion problem of canned food-grade beverage cans containing pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/38C25D5/48
CPCC25D11/38C25D5/48
Inventor 张旭明莫志英王振文方圆周纪名朱防修王挺
Owner SHOUGANG JINGTANG IRON & STEEL CO LTD
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