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One-time cold-rolled continuous annealing packaging steel and preparation method thereof

A continuous annealing technology for packaging, applied in the field of primary cold rolling and continuous annealing packaging steel and its preparation, can solve the problem of low transverse elongation

Inactive Publication Date: 2020-04-10
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a steel for primary cold rolling and continuous annealing packaging and a preparation method thereof, which solves or partially solves the technical problem in the prior art that the steel for primary cold rolling and continuous annealing packaging is low in transverse elongation after baking

Method used

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  • One-time cold-rolled continuous annealing packaging steel and preparation method thereof

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preparation example Construction

[0027] see figure 1 , based on the same inventive concept, the present application also provides a preparation method of one-time cold-rolled continuous unpacking steel, comprising the following steps:

[0028] Step 1, carry out molten iron pretreatment, converter smelting, refining, and continuous casting to obtain slabs. P: ≤ 0.015%, S: ≤ 0.012%, Als: 0.03-0.07%, N: 0.0125-0.0145%, and the rest are Fe and impurities.

[0029] In step 2, the slab is subjected to hot rolling, pickling and cold rolling to obtain strip steel.

[0030] In step 3, the strip is continuously withdrawn and leveled, and then tinned or chrome-plated to form a finished coil.

[0031] The specific implementation of this application will carry out hot metal pretreatment, converter smelting, refining, and continuous casting to obtain slabs. %, P: ≤ 0.015%, S: ≤ 0.012%, Als: 0.03-0.07%, N: 0.0125-0.0145%, the rest are Fe and impurities, the slab is subjected to hot rolling, pickling and cold rolling to o...

Embodiment 1

[0040]Hot metal pretreatment, converter smelting, refining, and continuous casting are carried out to obtain slabs. The chemical composition mass percentages of the slabs are C: 0.07%, Si: 0.01%, Mn: 0.35%, P: 0.011%, S: 0.008%, Als: 0.066%, N: 0.125%, and the rest are slabs of Fe and impurities. Then, the slab passes through the hot continuous rolling unit, that is, heating, rough rolling and descaling, rough rolling, head and tail cutting, finishing rolling and descaling, finishing rolling, laminar cooling, and coiling for hot continuous rolling. Among them, the heating furnace The heating temperature is 1190°C, the rough rolling adopts 1+5 passes, the finishing rolling temperature of the finishing mill is 878°C, and the coiling temperature is 577°C. In this way, after rough rolling, finishing rolling and laminar cooling, it is coiled by a coiler.

[0041] Then, make the hot-rolled coil go through the combined pickling unit, continuous unwinding unit and tinning unit, that ...

Embodiment 2

[0043] Hot metal pretreatment, converter smelting, refining, and continuous casting are carried out to obtain slabs. The chemical composition mass percentages of the slabs are C: 0.04%, Si: 0.015%, Mn: 0.23%, P: 0.011%, S: 0.005%, Als: 0.043%, N; 0.0135%, the rest are slabs of Fe and impurities. Then, the slab passes through the hot continuous rolling unit, that is, heating, rough rolling and descaling, rough rolling, head and tail cutting, finishing rolling and descaling, finishing rolling, laminar cooling, and coiling for hot continuous rolling. Among them, the heating furnace The heating temperature is 1235°C, the rough rolling adopts 3+3 passes, the finishing rolling temperature of the finishing mill is 897°C, and the coiling temperature is 575°C. In this way, after rough rolling, finishing rolling and laminar cooling, it is coiled by a coiler.

[0044] Then, make the hot-rolled coil go through the combined acid rolling unit, continuous withdrawal unit and tin-plating uni...

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Abstract

The invention discloses one-time cold-rolled continuous annealing packaging steel and a preparation method thereof, and belongs to the technical field of steel preparation. The one-time cold-rolled continuous annealing packaging steel comprises, by mass, 0.03%-0.08% of C, smaller than or equal to 0.02% of Si, 0.15%-0.40% of Mn, smaller than or equal to 0.015% of P, smaller than or equal to 0.012%of S, 0.03%-0.07% of Als, 0.0125%-0.0145% of N and the balance Fe and impurities. According to the one-time cold-rolled continuous annealing packaging steel and the preparation method thereof, the packaging steel with the ferrite+cementite structure and the high forming property can be produced, and the high transverse elongation after baking is achieved.

Description

technical field [0001] The invention relates to the technical field of steel preparation, in particular to a one-time cold-rolled continuous unpacking steel and a preparation method thereof. Background technique [0002] The one-time cold-rolled and continuous-unrolled packaging steel is a cold-rolled and continuously unrolled low-carbon steel sheet or steel strip obtained by electroplating with a tin layer or a chromium layer on both sides. It is mainly used in the fields of beverage cans, food cans and easy-open lids. [0003] The transverse elongation of the traditional one-time cold-rolled and continuous unpacking steel will drop sharply after the user's printing and baking, and the elongation is usually below 6%, which leads to the blackening of the rivets during complex forming such as easy-opening rivet forming. Or the emergence of cracking problems has plagued the packaging industry for a long time. SUMMARY OF THE INVENTION [0004] The invention provides a steel ...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C21D8/02C21D1/26
CPCC21D1/26C21D8/0226C21D2211/003C21D2211/005C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06
Inventor 方圆孙超凡吴志国陈凌峰徐海卫于孟莫志英宋浩王雅晴石云光林悦李海旭张梅王振文周保欣
Owner SHOUGANG CORPORATION
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