Steel sheet production method

A manufacturing method and technology for steel plates, applied in the field of steel plate manufacturing, can solve problems such as energy consumption and cost

Active Publication Date: 2017-02-22
KAO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current situation is that since a large amount of water is used in this washing, it takes a lot of energy cost to raise the temperature to the specified temperature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0115] Hereinafter, although an Example demonstrates this invention in more detail, this invention is not limited to these Examples.

[0116]

[0117] 〔Preparation of cleaning agent〕

[0118] Adding and mixing 2 mass % of sodium hydroxide, 0.2 mass % of sodium gluconate, 0.1 mass % of sodium edetate, nonionic surfactant [C 14 h 29 O(EO) 7 (PO) 2 (EO) 7 H) An aqueous solution of 0.023% by mass, 0.025% by mass of sodium polyacrylate, and 97.652% by mass of water was used as the cleaning agent A.

[0119] 〔Preparation of test water〕

[0120] As a model of ion-containing water such as industrial water used in steel plate manufacturing plants, test water was prepared and used for experiments. Add one or more inorganic substances selected from sodium chloride, calcium chloride (dihydrate), magnesium chloride (hexahydrate), potassium chloride, sodium nitrate, aluminum chloride, sodium carbonate, and sodium sulfate to ion-exchanged water. Stir the salt to dissolve it complete...

Embodiment A～C

[0138]

[0139]

[0140] A cold-rolled steel sheet with a thickness of 0.7 mm (dirt: iron powder and rolling oil) cut into a length of 70 mm and a width of 100 mm is immersed in cleaning agent A in an alkali cleaning tank (dipping time is 2 seconds), and it is removed from the alkali. Lift out of the sink.

[0141]

[0142] The steel plate after the above-mentioned alkali cleaning process is immersed in the above-mentioned cleaning agent A in the electrolytic cleaning tank, and electrolytic cleaning is carried out (the switching interval of the negative electrode and the positive electrode during the electrolysis time is 0.4 seconds, and the current density is 14A / dm 2 ), lift it out of the electrolytic cleaning tank.

[0143]

[0144] Using a nozzle (spray nozzle 1 / 4MVE11578 manufactured by H.IKEUCHI Co., Ltd.), spray test water W-1 on the steel plate after the above-mentioned electrolytic cleaning process at a spray pressure of 0.2 MPa and a spray volume of 10 ml / sec...

Embodiment A

[0165]

[0166] Except having used test waters W-1 to W-23, a rinse agent was prepared in the same manner as in Example A, and the dryness was evaluated using the water film residue after the washing process. The evaluation results are shown in Tables 4 and 5.

[0167] [Table 4]

[0168]

[0169] [table 5]

[0170]

[0171] From the results in Table 4 and Table 5, it can be seen that the dryness of the steel sheet is improved by setting the cation concentration of the inorganic salt of the rinse agent within a certain range.

[0172]

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PUM

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Abstract

The invention discloses a steel sheet production method that includes a washing step (1) wherein a steel sheet that has been cold rolled is washed, a rinsing step (2) wherein the steel plate that has undergone the washing step (1) is rinsed, and a drying step (3) wherein the steel sheet that has undergone the rinsing step (2) is dried. The rinsing step (2) includes one or more rinsing treatments, the final rinsing treatment using a rinsing agent [alpha] that includes a component (a) that is represented by general formula (1) (as shown in the description), the concentration of the component (a) being 150 mg / kg or less of the rinsing agent [alpha]. The rinsing agent [alpha] has an inorganic salt cation concentration of 2.0-18.0 mmol / kg and has a sulfate ion concentration of 0.75 mmol / kg or less. The steel sheet production method has a low waste water treatment load and can reduce energy costs for drying a steel sheet or the like post-washing.

Description

technical field [0001] The invention relates to a method for manufacturing a steel plate. Background technique [0002] When manufacturing cold-rolled steel sheets and cold-rolled rims, various processing steps are performed. Including the acid cleaning process to remove the oxide layer or the alkali cleaning process to remove rolling oil and anti-rust oil. In these cleaning steps, an acidic or alkaline cleaning solution is washed with warm water and dried with hot air. If the drying is insufficient, rust will form, so dehydration to remove water adhering to the steel plate is an important process, and various dehydration methods are implemented. Water is squeezed mechanically with a rubber roll called a squeeze roll, or an air wiper is installed before hot air drying to blow off as much water as possible adhering to the steel plate. In addition, in order to improve the dryness, the temperature of the washing water when washing the washing liquid is generally 70° C. or hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/14C25F1/00
CPCC23G1/24C11D1/62C11D11/0029C21D8/0236C21D8/0436C21D8/0478C21D9/46C22C38/00C23G1/00C23G1/19C25F1/00
Inventor 久保田和男
Owner KAO CORP
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