Manufacturing method of Ni-based super heat-resistant alloy and Ni-based super heat-resistant alloy

摘要

Provided are a Ni-based superheat resistant alloy for stably obtaining high tensile strength and a method for producing the same. By mass%, C: 0.10% or less, Si: 0.5% or less, Mn: 0.5% or less, P: 0.05% or less, S: 0.050% or less, Fe: 45% or less, Cr: 14.0 to 22.0%, Co: 18.0% or less, Mo: 8.0% or less, W: 5.0% or less, Al: 0.10 to 2.80%, Ti: 0. 50-5.50%, Nb: 5.8% or less, Ta: 2.0% or less, V: 1.0% or less, B: 0.030% or less, Zr: 0.10% or less, Mg: 0 .005% or less, the balance is composed of Ni and unavoidable impurities, and the grain orientation difference parameter Grain Origination Spread (GOS) measured by the SEM-EBSD method is 0.7 ° or more. Heat-resistant alloy and its manufacturing method.