| 摘要 |
The present invention provides a method of manufacturing a steel sheet using a detergent for a steel sheet having a good washing property for the oil stain even at a low temperature. The method of manufacturing of the present invention is a method of manufacturing a steel sheet, comprising: a washing step of soaking a steel sheet to which a stain is stuck in a detergent for a steel sheet for washing and a rinsing step of rinsing with water the steel sheet that is soaked and washed after the washing step, wherein the detergent for a steel sheet comprises: an alkali agent, one or more organic acid(s) or salt(s) selected from lactic acid, oxalic acid, citric acid, and salts of these, a nonionic surfactant represented by the general formula (1), one or more chelating agent(s) selected from gluconic acid, ethylenediaminetetraacetic acid, and salts of these, and water. |
| 主权项 |
1. A method of manufacturing a steel sheet, comprising: a washing step of soaking a steel sheet to which a stain is stuck in a detergent for a steel sheet for washing and a rinsing step of rinsing with water the steel sheet that is soaked and washed after the washing step, wherein
the detergent for a steel sheet comprises: (A) an alkali agent, (B) one or more organic acid(s) or salt(s) selected from lactic acid, oxalic acid, citric acid, and salts of these, (C) a nonionic surfactant represented by the following general formula (1):
R1—O—{(EO)n/(PO)m}—H (1) wherein R1 represents an aliphatic hydrocarbon group having 8 or more and 16 or less carbon atoms, EO represents an ethyleneoxy group, PO represents a propyleneoxy group, n represents the average addition number of moles of EO, m represents the average addition number of moles of PO, n is a number that satisfies 2 or more and 20 or less, m is a number that satisfies 1 or more and 20 or less, and the addition form of PO and EO in { } may be either of a random arrangement and a block arrangement, (D) one or more chelating agent(s) selected from gluconic acid, ethylenediaminetetraacetic acid, and salts of these, and (E) water, wherein the content of (B) the one or more organic acid(s) or salt(s) selected from lactic acid, oxalic acid, citric acid, and salts of these is 0.01% by mass or more and 5.0% by mass or less. |
