Method for producing deep drawing skin-passed hot-dip galvanizing sheet steel

A technology of hot-dip galvanized steel sheet and production method, which is applied in heat treatment furnace, heat treatment equipment, heat treatment process control and other directions, can solve the problem of large temperature fluctuation of furnace strip steel, large fluctuation of fairing elongation, and increasing influence of fairing process. and other problems, to achieve the effect of stable comprehensive forming performance, excellent comprehensive forming performance, and reducing influence

Active Publication Date: 2007-09-19
PANZHIHUA IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

IF steel has a higher annealing and recrystallization temperature than carbon aluminum killed steel. To complete the recrystallization annealing online, the unit needs to slow down and raise the temperature. Large fluctuations; for the skin-pass galvanized sheet, the skin-pass machine can only ensure the skin-pass effect of the skin-pass galvanized sheet under a large skin-pass pressure, which often leads to a large skin-pass elongation. In addition, in order to To ensure the quality of the skin-pass mill, it is necessary to adjust the skin-pass parameters according to the strip shape, resulti...

Method used

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  • Method for producing deep drawing skin-passed hot-dip galvanizing sheet steel
  • Method for producing deep drawing skin-passed hot-dip galvanizing sheet steel
  • Method for producing deep drawing skin-passed hot-dip galvanizing sheet steel

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Embodiment 1

[0022] Smelted in a converter and subjected to vacuum treatment to obtain the substrate of the present invention for producing deep-drawn skin-finished hot-dip galvanized sheets, its chemical composition (by weight percentage) contains C: 0.0060, Si: 0.020, Mn: 0.21, P: 0.008, S: 0.010, Als: 0.050, the balance is Fe and unavoidable impurities.

[0023] After continuous casting, the slab is heated and rolled at 1200°C to form a strip steel with a thickness of 3.25mm. The final temperature of hot rolling is 905°C. After rolling, it is rapidly cooled to 750°C and then air-cooled for 12s to ensure complete transformation of ferrite and phase precipitation. Precipitate, then enter the coiler to coil into coils, pickle the strip steel with hydrochloric acid after cooling, and roll it into a cold-rolled plate of 0.8mm at a reduction rate of 75% on the cold tandem rolling mill. The Sendzimir continuous hot-dip galvanizing production unit is used to produce deep-drawing skin-finishing ...

Embodiment 2

[0025] Smelted in a converter and subjected to vacuum treatment to obtain the substrate of the present invention for producing deep-drawn skin-finished hot-dip galvanized sheets, its chemical composition (by weight percentage) contains C: 0.0030, Si: 0.010, Mn: 0.18, P: 0.012, S: 0.013, Als: 0.040, the balance is Fe and unavoidable impurities. After continuous casting, the slab is heated and rolled at 1200°C to form a strip steel with a thickness of 2.75mm. The final rolling temperature of hot rolling is 895°C. After rolling, it is rapidly cooled to 750°C and then air-cooled for 10s to ensure complete transformation of ferrite and phase precipitation. Precipitate, then enter the coiler to coil into coils, pickle the strip steel with hydrochloric acid after cooling, and roll it into a cold-rolled plate of 0.7mm at a reduction rate of 74.5% on the cold tandem rolling mill. The Sendzimir continuous hot-dip galvanizing production unit is used to produce deep-drawing skin-finishing...

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Abstract

The invention discloses a manufacturing method of deep drawing finish heat galvanized steel sheet, capable of producing the deep drawing finish heat galvanized steel sheet on the continuous heat galvanized line for building materials. The method on the continuous heat galvanized line for building materials uses following technique measures: carbon content of the substrate is controlled in 0.0030 to 0.0060 % by weight percent, Ti* content is controlled in 0.02 to 0.04 % by weight percent; the heat rolling is closed in austenite area near Ar3, after rolling, quickly cooling to 700-780 DEG C, and coiling after cooling 10-15s; annealing in 780-880 DEG C temperature range. Under condition of ensuring r value, the product crystal grain is thinned and the influence of annealing temperature fluctuation to the product crystal grain size is reduced, thereby reducing influence of finish extensibility to the product yield strength and the n value to obtain the deep drawing finish heat galvanized steel sheet with stable and excellent synthesis forming performance.

Description

technical field [0001] The invention relates to a production method of a galvanized steel sheet, in particular to a method for producing a deep-drawing skin-skinned hot-dip galvanized sheet on a continuous hot-dip galvanizing line for building materials. Background technique [0002] The annealing furnace in the continuous hot-dip galvanizing line generally does not have an over-aging section. It is necessary to use ultra-low carbon interstitial-free steel (IF steel) to produce deep-drawn hot-dip galvanized sheets. Requires ultra-low carbon (C≤0.0050%, low nitrogen (N≤0.0030%), final rolling at a temperature above Ar3 (the temperature at which austenite transforms to ferrite) during hot rolling, and high-temperature annealing for hot-dip galvanizing to improve r value (plastic strain ratio), use a smaller skin elongation to reduce the yield strength caused by work hardening, and reduce the n value (work hardening index). For continuous hot-dip galvanizing lines for building ...

Claims

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Application Information

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IPC IPC(8): B23P17/00C22C38/14B21B37/74C21D9/48C21D11/00
Inventor 郑之旺
Owner PANZHIHUA IRON AND STEEL
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