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Production method for cold-rolled IF steel with high surface cleanliness

A production method and cleaning technology, applied in the direction of workpiece cleaning device, workpiece surface treatment equipment, metal rolling, etc., can solve the problem that it is difficult to obviously improve the cleanliness of finished strip steel, cannot meet the production requirements of high-cleanliness cold-rolled IF steel, Unstable production and other issues, to achieve significant economic benefits and brand benefits, low overall manufacturing costs, mature and stable production process

Active Publication Date: 2021-11-19
SD STEEL RIZHAO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is a routine operation in the annealing process. When the cleanliness of the pickling raw material is poor, it is difficult to significantly improve the cleanliness of the finished strip after annealing, and the consumption of brush rolls will rise sharply under high contact pressure, and the cost cannot meet high cleanliness. Production Requirements of Cold Rolled IF Steel
[0007]Therefore, there is an urgent need to design a production method of high surface cleanliness cold rolled IF steel to solve the problem of unstable production of existing high surface cleanliness cold rolled IF steel high cost problem

Method used

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  • Production method for cold-rolled IF steel with high surface cleanliness

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] In this example 1, the target IF steel for a production schedule is 500 tons in total, the thickness of the finished cold-rolled steel strip is 0.65-0.80mm, and the width is 1450-1780mm; The reflectivity is 92.2-93.1%, and the finished steel strips all meet the requirements of customers for high-end automobiles and household appliances.

[0047] The production steps of embodiment 1 are as follows:

[0048] (1) After the hot-rolled IF steel coil is uncoiled and welded, the scale is broken by tension leveling, the elongation rate of tension leveling is 1.7-1.9%, and the insertion depths of 1# and 2# bending rolls and straightening rolls are 30mm, 23mm and 11mm respectively;

[0049] (2) Carry out continuous shallow tank turbulent flow hydrochloric acid pickling to the strip steel, the pickling temperature is 80-82°C, the free acid concentration in 3# acid tank is 179g / L, the pickling speed is 120m / min, and the surface is free from under-pickling or Pickling;

[0050] (3...

Embodiment 2

[0060] In this example 2, the target IF steel for a production schedule is 500 tons in total, the thickness of the cold-rolled finished strip is 0.65-0.80mm, and the width is 1550-1850mm; the strips produced in batches all have good surface cleanliness. The reflectivity is 92.0-92.6%, and the finished steel strips all meet the requirements of customers for high-end automobiles and household appliances.

[0061] The production steps of embodiment 2 are as follows:

[0062] (1) After the hot-rolled IF steel coil is uncoiled and welded, the scale is broken by tension leveling, the elongation rate of tension leveling is 1.5-1.8%, and the insertion depths of 1# and 2# bending rolls and straightening rolls are 28mm, 21.5mm and 12mm respectively;

[0063] (2) Carry out continuous shallow tank turbulent flow hydrochloric acid pickling to the strip steel, the pickling temperature is 80~82°C, the free acid concentration in 3# acid tank is 169g / L, the pickling speed is 140m / min, and ther...

Embodiment 3

[0074] In Example 3, a total of 500 tons of IF steel is targeted for production scheduling, and the finished cold-rolled steel strip has a thickness of 0.65-0.80 mm and a width of 1000-1500 mm; the strips produced in batches all have good surface cleanliness. The reflectivity is 92.2-93.0%, and the finished steel strips all meet the requirements of customers for high-end automobiles and household appliances.

[0075] The production steps of embodiment 3 are as follows:

[0076] (1) After the hot-rolled IF steel coil is uncoiled and welded, the scale is broken by tension leveling, the elongation rate of tension leveling is 1.5-2.0%, and the insertion depths of 1# and 2# bending rollers and straightening rollers are 30mm, 23mm and 11mm respectively;

[0077] (2) Carry out continuous shallow tank turbulent flow hydrochloric acid pickling to the strip steel, the pickling temperature is 75~78°C, the free acid concentration in the 3# acid tank is 190g / L, the pickling speed is 150m / m...

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Abstract

The invention discloses a production method for cold-rolled IF steel with high surface cleanliness. The production method comprises the following steps that 1, a hot-rolled IF steel coil is uncoiled and welded and then is stretched, straightened and subjected to scale breaking; 2, continuous shallow slot turbulence hydrochloric acid pickling is carried out on the strip steel formed by pulling the steel coil open; 3, a pickling corrosion inhibitor is added 12 hours in advance; 4, the strip steel subjected to acid pickling is rinsed and dried; 5, five machine frames carry out continuous rolling, the F1-F4 machine frames adopt small-roughness working rollers for large pressing, and the F5 machine frame adopts a large-roughness working roller for light flattening; 6, the cold and hard steel coil obtained after continuous rolling enters a cleaning unit for powerful cleaning; 7, the strip steel subjected to electrolytic cleaning is rinsed and dried; 8, the surface cleanliness of the strip steel is measured every five coils at an inlet of an outlet loop of the cleaning unit; 9, nitrogen-hydrogen mixed protective gas with the hydrogen concentration of 5-7% is adopted for continuous annealing, flattening, trimming and oiling are carried out, and then coiling is carried out so as to obtain a finished steel coil; The production method has the advantages that the whole production process is mature and stable, and the comprehensive manufacturing cost is low; and the surface reflectivity of the cold-rolled IF strip steel at the outlet of the cleaning section reaches 92% or above.

Description

technical field [0001] The invention relates to the technical field of metal material processing, in particular to a production method of cold-rolled IF steel with high surface cleanliness. Background technique [0002] It is well known that cold-rolled IF steel (interstitial-free steel) has excellent deep-drawing and non-aging properties, and is widely used in manufacturing industries such as automobiles and home appliances. Especially when it is made into high-grade visual appearance parts such as passenger car fenders and refrigerator door panels, cold-rolled IF steel is the cold-rolled product with the most stringent surface quality requirements. [0003] As the main indicator of surface quality, the surface cleanliness of cold-rolled IF steel is usually characterized by the surface reflectance of the strip after cleaning: the higher the surface reflectivity, the less the residual oil and the total amount of residual iron on the surface of the strip, that is The better ...

Claims

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Application Information

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IPC IPC(8): B21B1/26B21B45/02
CPCB21B1/26B21B45/0269Y02P10/20
Inventor 王乐高兴昌陈晓潇王京先张冲冲宇凡刘琳康华伟孙冰王永新朱信成段磊
Owner SD STEEL RIZHAO CO LTD
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