KR920014947A - Nickel electroplating cold rolled steel sheet with excellent press formability and phosphate treatment and its manufacturing method - Google Patents

Abstract

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Description

Nickel electroplating cold rolled steel sheet with excellent press formability and phosphate treatment and its manufacturing method

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1 is a graph showing the relationship between the rankford value and the limit draw ratio of the conventional continuous annealing cold rolled steel sheet and the conventional box annealing cold rolled steel sheet, all of which are not plated, and FIG. In the examples and comparative examples outside the scope of the present invention, the amount of adhesion of the nickel electroplating layer exhibits an effect on the number of initial precipitation nuclei of the phosphate, the distribution density of the nickel particles, the coefficient of friction, and the particle size of the crystal of the phosphate film. FIG. 3 is a graph showing the relationship between the rank pod value and the limit draw ratio in Examples of the present invention and Comparative Examples outside the scope of the present invention.

Claims (18)

(A) Cold rolled steel plate, which is essentially as follows, carbon (C): 0.06 wt.% Or less, silicon (Si): 0.5 wt.% Or less, manganese (Mn): 2.5 wt.% Or less, phosphorus (P) : 0.1 wt.% Or less, sulfur (S): 0.025 wt.% Or less, soluble aluminum (Sol.Al): 0.10 wt.% Or less, nitrogen (N): 0.005 wt.% Or less, and the rest is iron (Fe) And unavoidable impurities; (B) is formed on at least one surface of this cold-rolled steel sheet, nickel particles are precipitated with a distribution density of 1 × 10 ¹² or more / m 2, and the coating thickness of the nickel electroplating layer per one side of the cold-rolled steel sheet is 5 to 60 mg /. An electroplating cold-rolled steel sheet having excellent press formability and phosphate treatment property, which is made of a nickel electroplating layer in the range of m 2 and a nickel oxide film having an average thickness in the range of 0.0005 to 0.003 µm formed on the surface of the nickel electroplating layer. . The nickel electroplated cold rolled steel sheet according to claim 1, wherein the cold rolled steel sheet additionally contains titanium (Ti) in an amount of 0.15 wt.% Or less. 2. The nickel electroplated cold rolled steel sheet according to claim 1, wherein the cold rolled steel sheet additionally contains niobium (Nb) in an amount of 0.15 wt.% Or less. 3. The nickel electroplated cold rolled steel sheet according to claim 2, wherein the cold rolled steel sheet additionally contains niobium (Nb) in an amount of 0.15 wt.% Or less. 3. The nickel electroplated cold rolled steel sheet according to claim 2, wherein the cold rolled steel sheet additionally contains boron (B) in an amount of 0.003 wt.% Or less. 4. The nickel electroplated cold rolled steel sheet according to claim 3, wherein the cold rolled steel sheet additionally contains boron (B) in an amount of 0.003 wt.% Or less. 5. The nickel electroplated cold rolled steel sheet according to claim 4, wherein the cold rolled steel sheet additionally contains boron (B) in an amount of 0.003 wt.% Or less. The nickel electroplated cold rolled steel sheet according to claim 1, wherein the nickel oxide film has an average thickness in the range of 0.001 to 0.002 µm. (A) In essence, the steel ingots are prepared as follows: carbon (C): 0.06 wt.% Or less, silicon (Si): 0.5 wt.% Or less, manganese (Mn): 2.5 wt.% Or less, phosphorus (P) ): 0.1 wt.% Or less, sulfur (S): 0.025 wt.% Or less, soluble aluminum (Sol.Al): 0.10 wt.% Or less, nitrogen (N): 0.005 wt.% Or less, and the rest is iron (Fe) ) And unavoidable impurities; (B) Next, the steel ingot is hot rolled to produce a hot rolled steel sheet, and (c) cold rolled hot rolled steel sheet at a reduction ratio within the range of 60-85% to produce a cold rolled steel sheet, and (d) cold rolled steel sheet. A continuous annealing treatment, in which the steel sheet is heated to a recrystallization temperature and then slowly cooled, is subjected to this cold rolled steel sheet, and (e) the continuous annealing cold rolled steel sheet is subjected to continuous nickel electroplating in an acidic electroplating bath to form a cold rolled steel sheet. Nickel particles are deposited on at least one surface of at a distribution density of 1 × 10 ¹² / m 2 or more, and a nickel electroplating layer having an adhesion amount in the range of 5 to 60 mg / m 2 per one side of the cold rolled steel sheet is formed. Cold rolled steel sheet having a nickel electroplating layer on at least one surface was immersed in a neutral or alkaline bath to form a nickel oxide film having an average thickness of 0.0005 to 0.003 µm on the surface of the nickel electroplating layer. A method for fabricating a press forming process step in the resistance and the phosphate treatability is high nickel electroplated cold-rolled steel sheet. The method according to claim 9, wherein the cold rolled steel sheet additionally contains titanium (Ti) in an amount of 0.15 wt.% Or less. 10. The method according to claim 9, wherein the cold rolled steel sheet additionally contains niobium (Nb) in an amount of 0.15 wt.% Or less. The method according to claim 10, wherein the cold rolled steel sheet additionally contains niobium (Nb) in an amount of 0.15 wt.% Or less. The method according to claim 10, wherein the cold rolled steel sheet additionally contains boron (B) in an amount of 0.003 wt.% Or less. The method according to claim 11, wherein the cold rolled steel sheet additionally contains boron (B) in an amount of 0.003 wt.% Or less. The method according to claim 12, wherein the cold rolled steel sheet additionally contains boron (B) in an amount of 0.003 wt.% Or less. 10. The method according to claim 9, wherein the cold rolled steel sheet having the nickel electroplating layer is subjected to anodic electrolytic treatment in a neutral bath or an alkali bath. The method according to claim 9, wherein the surface of the cold rolled steel sheet is pickled to clean prior to the continuous nickel electroplating treatment. The manufacturing method according to claim 9, wherein the oxide film has an average thickness in the range of 0.001 to 0.002 mu m. ※ Note: This is to be disclosed by the original application.