A kind of ultra-thick coating hot-dip galvanized steel strip for corrugated pipe of underground pipe gallery and production method thereof

A technology of underground pipe gallery and production method, which is applied in the direction of coating, hot-dip plating process, metal material coating process, etc., and can solve the problem of high core heat energy of thick gauge steel strip, low air knife injection pressure, and zinc flow edge Thickness and other problems, to achieve the effect of improving zinc scraping ability, small air knife scraping zinc ability, and reducing coating edge thickness

Active Publication Date: 2021-06-08
TANGSHAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When producing thick-gauge and thick-coated galvanized steel strips, due to the slow production speed and low air knife injection pressure, and the core heat energy of thick-gauge steel strips is high, defects such as zinc flow marks and edge thickness are prone to occur, especially 600g / m 2 (Double-sided) ultra-thick galvanized layer, the limit for galvanized line design

Method used

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  • A kind of ultra-thick coating hot-dip galvanized steel strip for corrugated pipe of underground pipe gallery and production method thereof
  • A kind of ultra-thick coating hot-dip galvanized steel strip for corrugated pipe of underground pipe gallery and production method thereof
  • A kind of ultra-thick coating hot-dip galvanized steel strip for corrugated pipe of underground pipe gallery and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The specifications of the ultra-thick coated hot-dip galvanized steel strip for the bellows of the underground pipe gallery in this embodiment are: thickness 1.6mm, width 1396mm, and its chemical composition and mass percentage are shown in Table 1.

[0026] The production method of the ultra-thick coated hot-dip galvanized steel strip for the corrugated pipe of the underground pipe gallery in this embodiment includes converter smelting, LF refining, continuous casting, hot rolling, cold rolling and galvanizing processes, and the specific process steps are as follows:

[0027] (1) LF refining process: After smelting, the molten steel enters LF refining, and the refined molten steel C: 0.045%, Mn: 0.17%;

[0028] (2) Hot rolling process: the heating temperature is 1230°C, the final rolling temperature is 892°C, and the crimping temperature is 660°C;

[0029] (3) Cold rolling process: the hot-rolled strip is cold-rolled after pickling, the total reduction rate of cold-rol...

Embodiment 2

[0033] The specifications of the ultra-thick coated hot-dip galvanized steel strip for the bellows of the underground pipe gallery in this embodiment are: thickness 1.6mm, width 1396mm, and its chemical composition and mass percentage are shown in Table 1.

[0034] The production method of the ultra-thick coated hot-dip galvanized steel strip for the corrugated pipe of the underground pipe gallery in this embodiment includes converter smelting, LF refining, continuous casting, hot rolling, cold rolling and galvanizing processes, and the specific process steps are as follows:

[0035] (1) LF refining process: After smelting, molten steel enters LF refining, and the refined molten steel C: 0.045%, Mn: 0.25%;

[0036] (2) Hot rolling process: the heating temperature is 1235°C, the final rolling temperature is 890°C, and the crimping temperature is 662°C;

[0037] (3) Cold rolling process: the hot-rolled strip is cold-rolled after pickling, the total reduction rate of cold-rolling...

Embodiment 3

[0041] The specifications of the ultra-thick coated hot-dip galvanized steel strip for the bellows of the underground pipe gallery in this embodiment are: thickness 1.3mm, width 1250mm, and its chemical composition and mass percentage are shown in Table 1.

[0042] The production method of the ultra-thick coated hot-dip galvanized steel strip for the corrugated pipe of the underground pipe gallery in this embodiment includes converter smelting, LF refining, continuous casting, hot rolling, cold rolling and galvanizing processes, and the specific process steps are as follows:

[0043](1) LF refining process: After smelting, the molten steel enters LF refining, and the refined molten steel C: 0.050%, Mn: 0.20%;

[0044] (2) Hot rolling process: the heating temperature is 1240°C, the final rolling temperature is 895°C, and the crimping temperature is 656°C;

[0045] (3) Cold rolling process: the hot-rolled strip is cold-rolled after pickling, the total reduction rate of cold-roll...

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Abstract

The invention discloses an ultra-thick coated hot-dip galvanized steel strip for corrugated pipes of an underground pipe gallery and a production method thereof. The chemical composition and mass percentage of the hot-dip galvanized steel strip are: C: 0.045-0.065%, Mn : 0.15~0.25%, S≤0.020%, P≤0.020%, Si≤0.03%, Als≥0.020%, the rest is iron and unavoidable impurities; the production methods include converter smelting, LF refining, continuous casting, thermal Rolling, cold rolling and galvanizing processes. The invention guarantees the appropriate mechanical properties of the steel strip through reasonable composition design and hot rolling and galvanizing annealing process design; and adopts segmental control measures for reducing the height of the air knife, increasing the distance between the knife lip and the strip steel, and the opening degree of the air knife knife lip , suppressing the generation of zinc flow marks and edge thickness defects, meeting the needs of the underground pipe gallery industry for ultra-thick coated hot-dip galvanized steel strips, and having significant economic benefits.

Description

technical field [0001] The invention belongs to the technical field of hot-dip galvanized steel strip production, and in particular relates to an ultra-thick coated hot-dip galvanized steel strip for corrugated pipes of an underground pipe gallery and a production method thereof. Background technique [0002] Compared with the traditional reinforced concrete form, the corrugated pipe of the underground pipe gallery has the advantages of high strength, good flexibility, light weight, convenient construction, strong seismic and deformation resistance, and more environmental protection. With the development of galvanizing technology, it has a certain strength. The ultra-thick coated hot-dip galvanized steel strip becomes the ideal material for the corrugated pipe of the underground pipe gallery. [0003] The corrugated pipe of the underground pipe gallery requires sufficient strength and rigidity, and the service life is greater than 100 years. The galvanized steel strip curren...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/06C22C38/04C22C38/02C23C2/06C23C2/40C23C2/20C21D8/02
CPCC21D8/0205C21D8/0247C22C38/002C22C38/02C22C38/04C22C38/06C23C2/06C23C2/20C23C2/40
Inventor 梅淑文杨青宋志岗孙恺王力达张健吴旻王超弓俊杰
Owner TANGSHAN IRON & STEEL GROUP
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