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Low-yield strength anti-ageing continuous annealing cold-roll steel sheet and production method thereof

A low-yield strength, cold-rolled steel plate technology, applied in the field of steel rolling, can solve the problems of poor process control stability, small diameter of furnace rolls in the over-aging section, poor mechanical properties, etc., and achieve the effect of expanding product use and expanding the range of product thickness specifications

Inactive Publication Date: 2012-09-05
PANGANG GROUP VANADIUM TITANIUM & RESOURCES +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The horizontal unit designed to produce only CQ and DQ grade continuous annealing steel plates and the continuous annealing / hot-dip galvanizing dual-purpose unit transformed from the continuous hot-dip galvanizing unit for building materials have the advantages of short annealing cycle, low primary cooling rate, and over-aging furnace rolls. Small diameter, poor stability of process control, etc. If the shape of the raw material is poor, in order to ensure the smooth production process, a larger unit tension should be used. In order to ensure the shape and surface roughness of the product, it is necessary to use a higher Large skin elongation and tension leveling elongation, when IF steel is produced by conventional production methods, the mechanical properties of the finished product are poor, and the yield strength is usually above 200Mpa. For products above 1.0mm, the yield strength is as high as 220Mpa or above, which limits the product quality. It cannot be used in deep drawing occasions, which is a long-standing technical problem in this field

Method used

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  • Low-yield strength anti-ageing continuous annealing cold-roll steel sheet and production method thereof
  • Low-yield strength anti-ageing continuous annealing cold-roll steel sheet and production method thereof
  • Low-yield strength anti-ageing continuous annealing cold-roll steel sheet and production method thereof

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Effect test

Embodiment 1

[0045] Smelted in a converter and subjected to vacuum treatment to obtain molten steel for producing low-yield-strength aging-resistant cold-rolled steel sheets according to the present invention, its chemical composition (by weight percentage) contains C: 0.0060, Si: 0.010, Mn: 0.18, P: 0.010, S: 0.010 , Ti: 0.073, Als: 0.045, and the balance is Fe and unavoidable impurities.

[0046] After continuous casting, the slab is heated and rolled at 1200°C to form a strip steel with a thickness of 2.50mm. The final rolling temperature of hot rolling is 880°C. After rolling, it is rapidly cooled to 780°C and then air-cooled for 10s to ensure complete transformation of ferrite and precipitated phases. Precipitate, then enter the coiler to coil into coils, pickle the strip steel with hydrochloric acid (170-190g / L) after cooling, and roll it into a cold-rolled sheet of 0.5mm with a reduction rate of 80.0% on the cold tandem mill. The rolled steel strip is passed through continuous annea...

Embodiment 2

[0048] Smelted in a converter and subjected to vacuum treatment to obtain molten steel for producing low-yield-strength aging-resistant cold-rolled steel sheets according to the present invention, its chemical composition (by weight percentage) contains C: 0.0050, Si: 0.020, Mn: 0.20, P: 0.012, S: 0.013 , Ti: 0.070, Als: 0.040, and the balance is Fe and unavoidable impurities.

[0049] 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 890°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, and 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 0.6mm with a reduction rate of 78.2% on the cold tandem rolling mill. An annealing / hot-dip galvanizing dual-purpose unit is used...

Embodiment 3

[0051] Smelted in a converter and subjected to vacuum treatment to obtain molten steel for producing low-yield-strength aging-resistant cold-rolled steel sheets according to the present invention, its chemical composition (by weight percentage) contains C: 0.0045, Si: 0.010, Mn: 0.18, P: 0.010, S: 0.010 , Ti: 0.068, Als: 0.050, and the balance is Fe and unavoidable impurities.

[0052] 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 890°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 with a reduction rate of 74.5% on the cold tandem rolling mill. An annealing / hot-dip galvanizing dual-purpose unit is used to ...

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Abstract

The invention belongs to the field of roll steel, in particular to a low-yield strength anti-ageing continuous annealing cold-roll steel sheet and a production method thereof, which solves the technical problem that stable-performance low-yield strength anti-ageing cold-roll steel sheets are difficult to be produced on a machine set with worse equipment level. The technical scheme of the invention is characterized by providing the low-yield strength anti-ageing cold-roll steel sheet and the production method thereof. The method of the invention can be implemented on the machine set with worseequipment level; and by adopting the method of the invention, the stable-performance low-yield strength anti-ageing cold-roll steel sheet can be produced, and the technical problem existing in the field of roll steel for a long term can be overcome.

Description

technical field [0001] The invention belongs to the field of steel rolling, and in particular relates to a low-yield-strength aging-resistant continuous-annealing cold-rolled steel plate and a production method thereof. Background technique [0002] When low-yield-strength continuous-annealing cold-rolled sheets are produced with low-carbon steel, because the strip steel runs in the unit to produce discontinuous yielding, it is easy to form cross-grain defects on the surface of the strip steel, which affects the appearance of the steel plate surface. [0003] IF steel (Interstitial-Free Steel, that is, interstitial atom-free steel) is to add a small amount of alloying elements (mainly titanium and niobium) to ultra-low carbon steel (a carbon content below 0.005%) to make the C in the steel , N interstitial atoms are completely fixed into carbon and nitrogen compounds, and there are no interstitial atoms in the steel, which makes the steel have excellent formability and aging...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14C21D8/02
Inventor 郑之旺娄燕王敏莉刘庆春王平利梁英
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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