HIGH ALLOY FOR OIL WELL USE, HIGH ALLOY PIPE, STEEL PLATE AND PRODUCTION METHOD OF A HIGH ALLOY PI

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Provided is a high alloy for oil well, having high strength and excellent hot workability and SCC resistance. The high alloy for oil well according to the present embodiment consists of, in mass%, C : 0.03% or less, Si : 1.0% or less, Mn : 0.05 to 1.5%, P : 0.03% or less, S : 0.03% or less, Ni : 26.0 to 40.0%, Cr : 22.0 to 30.0%, Mo : 0.01% or more to less than 5.0%, Cu : 0.1 to 3.0%, Al : 0.001 to 0.30%, N : more than 0.05% to 0.30% or less, O : 0.010% or less, Ag : 0.005 to 1.0%, Ca : 0 to 0.01%, Mg : 0 to 0.01%, and rare earth metals : 0 to 0.2%, with the balance being Fe and impurities, wherein the alloy satisfies the following Formulae (1) and (2), wherein the high alloy for oil well has yield strength of 758 MPa or more : €ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ5 × Cu + (1000 × Ag) 2 ‰¥ 40€ƒ€ƒ€ƒ€ƒ€ƒ(1) €ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒCu + 6 × Ag - 500 × (Ca + Mg + REM) ‰¤ 3.5€ƒ€ƒ€ƒ€ƒ€ƒ(2) where, each element symbol in each Formula is substituted by the content (in mass%) of each element.