NICKEL ALLOY WITH GOOD CORROSION RESISTANCE AND HIGH TENSILE STRENGTH AND METHOD FOR PRODUCTION OF SEMI-PRODUCTS Russian patent published in 2023 - IPC C22C19/05 C22C1/02 C22C30/00 C22F1/10 B22F9/08 C22B9/16 C22B9/18 C22B9/20 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, namely to the production of semi-products of a nickel alloy with high resistance to hydrogen embrittlement and high mechanical properties. A method for the production of a semi-product of a nickel alloy containing, wt.%: Ni 50-55, Cr 17-21, Mo > 0-9, W 0-9, Nb 1-5.7, Ta > 0-4.7, Ti 0.1-3.0, Al 0.4-4.0, Co no more than 3.0, Mn no more than 0.35, Si no more than 0.35, Cu no more than 0.23, C 0.001-0.045, S no more than 0.01, P 0.001-0.02, B 0.001-0.01, the rest is Fe, and usual impurities caused by production, when following ratios are met: Nb+Ta 1-5.7, Al+Ti > 1.2-5, Mo+W 3-9, includes vacuum induction melting (VIM) and casting into ingots, annealing of ingots to relieve stresses in a temperature range from 500 to 1250°C for up to 110 hours. Then, ingots are processed in the process of electroslag remelting (ESR) and/or vacuum arc remelting (VAR), and, if necessary, the alloy is remelted in the process of electroslag remelting or vacuum arc remelting. Remelted ingots are subjected to homogenizing annealing in a temperature range from 500 to 1250°C for up to 150 h. Then, annealed ingots are subjected to hot and cold deformation to obtain a semi-product, at least one annealing per solid solution is performed in a temperature range from 900 to 1150°C for 0.1 to 60 h, followed by cooling in air, in mobile annealing atmosphere, in inert gas, in water, in polymer, or in oil.

EFFECT: semi-product has following properties: a coefficient of elongation at break during the test in acid gas is more than 75%, with a yield strength in air > 100 thousand pounds/in² (ksi).

13 cl, 37 dwg, 8 tbl