Nippon Steel Corporation

Nihon Parkerizing Co., Ltd.

Nippon Steel & Sumitomo Metal Corporation

Manabu Kumagai

Shinichi Yamaguchi

Yasuto Goto

Masao Kurosaki

Yuta Kobayashi

Kensuke Mizuno

Takumi Kozaki

Masaru Mochizuki

A water-based lubricant for plastic working of a metallic material is obtained by adding to a water-based medium: (A) a polymer and/or a salt thereof containing a carboxylic acid or a derivative thereof as a constituent monomer; (B) an oxoacid of tungsten, of silicon, or of phosphorus, or a condensate thereof, and/or a salt thereof; (C) a hydroxide of an alkali metal; and (D) a lubricating component (D), and the solid content weight ratio (A)/[(A)+(B)+(C)+(D)] is 0.05 to 0.4.

Aqueous lubricant for plastic working of metal material and having superior gas clogging resistance and post-moisture absorption workability

An aqueous treating solution for an Sn-based plated steel sheet, comprising (A) an organic material, (B) a water-soluble chromium compound, (C) a water-dispersible silica, and water, wherein the organic material (A) is at least one member selected from an oxy-acid with the ratio of hydroxyl group/carboxyl group in one molecule being from 3/1 to 10/1, its lactone form and an oxide derivative thereof, the water-soluble chromium compound (B) does not contain hexavalent chromium, and pH is from 0.7 to 6.0.

Aqueous treating solution for Sn-based plated steel sheet excellent in corrosion resistance and paint adhesion, and production method of surface-treated steel sheet

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Tokyo, Japan

Manabu Kumagai