SHAPED MATERIAL FOR DOWNHOLE TOOL MEMBER, DOWNHOLE TOOL MEMBER, AND DOWNHOLE TOOL

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A stock shape for a downhole tool component includes a magnesium alloy including a phase containing 70 to 95 wt.% of magnesium in which 0 wt.% or more and less than 0.3 wt.% of a rare earth metal, a metal material other than the magnesium and the rare earth metal, and 0.1 to 20 wt.% of a degradation accelerator are distributed, and the stock shape has an average particle size of the metal material of 1 to 300 µm, tensile strength of 200 to 500 MPa, and a degradation rate in a 2% potassium chloride aqueous solution at 93°C of not less than 20 mg/cm 2 and not greater than 20000 mg/cm 2 per day. Accordingly, a downhole tool having high strength and being readily degradable is established.