Hot forging die and production method therefor

Abstract

Provided are a hot forging die that has superior high-temperature compressive strength and can achieve a long die service life, and a method for producing the same. Provided are a hot forging die comprising a casting alloy having a component composition of, in mass %, W: 7.5 to 20.0%, Mo: 0 to 5.0%, Al: 5.0 to 7.5%, Cr: 0.5 to 5.0%, Ta: 1.0 to 12.0%, C: 0.01 to 0.15%, B: 0.03% or less, S: 0.015% or less, 0 to 0.020% in total of one or two or more selected from rare earth elements, Y, Ca, and Mg, 0.5% or less in total of one or two selected from Zr and Hf, Ti: 5.0% or less, Nb: 5.0% or less, and Co: 25.0% or less, and the balance of Ni with inevitable impurities, and having an equivalent circle diameter of a gamma prime phase in a dendrite core of 2.20 μm or less, and a method for producing a hot forging die, which is preferable for the above.

Dependencies are inferred from the claim text.