Idemitsu Kosan Company, Limited

Rikki Homma

Yutaka Minami

Tomoaki Takebe

Katsumi Ichitani

Takashi Kondo

A water-soluble quenching fluid composition prepared by blending: water, at least one kind selected from a polyoxyalkylene glycol and a derivative thereof (A), and an alkylene glycol ether (B), the polyoxyalkylene glycol or a derivative thereof (A) having a mass average molecular weight of 10,000 or more and 100,000 or less, the alkylene glycol ether (B) having a solubility in 100 mL of water at 20&#xb0; C. of 2.0 g/100 mL-HO or less and a molecular weight per 1 mol of 1,000 g/mol or less.

Water-soluble quenching oil composition

Provided is a water-based quenching liquid composition which is slow in a cooling rate and is able to suppress quenching crack. The water-based quenching liquid composition is one containing water (A), a linear polyalkylene glycol compound (B), and a branched polyhydric alcohol alkylene oxide adduct (C), wherein the linear polyalkylene glycol compound (B) has a mass average molecular weight of 10,000 or more, and the branched polyhydric alcohol alkylene oxide adduct (C) is a mixed adduct of alkylene oxides having 2 to 3 carbon atoms and has a mass average molecular weight of 10,000 or more.

Water-based quenching liquid composition and method for manufacturing metal material using same

A water-soluble quenching fluid composition prepared by blending: water, at least one kind selected from a polyoxyalkylene glycol and a derivative thereof (A), and at least one kind selected from an alkylene glycol ether (B) and a monocarboxylic acid (C), the polyoxyalkylene glycol or a derivative thereof (A) having a mass average molecular weight of 10,000 or more and 100,000 or less, the alkylene glycol ether (B) having a boiling point of 200&#xb0; C. or more and a molecular weight per 1 mol of 1,000 g/mol or less.

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Yokohama, Japan

Rikki Homma