Nickel-based alloy, method and use

a technology of nickel-based alloys and alloys, applied in the field of nickel-based alloys, methods and use, can solve the problems of increasing the depth of oil and affecting the chemical homogeneity of products, and achieve the effects of reducing chemical irregularities, and reducing the number of alloys

Inactive Publication Date: 2018-06-21
FORONI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0007]The Applicant, after having worked for some years on the V.A.R. (Vacuum Arch Remelting) recasting method so as to minimise the chemical irregularities and on the heat transformation process to optimise it and make it repetitive using sophisticated machinery, has concluded th

Problems solved by technology

In recent years, as a result of the significant increase in the energy demand, for the oil extraction industry the problem has arisen of finding oil at increasingly greater depths, both on land and on the seabed.
This increase has forced manufacture

Method used

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  • Nickel-based alloy, method and use
  • Nickel-based alloy, method and use
  • Nickel-based alloy, method and use

Examples

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example 1

Implementing the Method

[0049]The metal mass which the invention relates to is preferably melted in an electric arc furnace, refined in A.O.D. (Argon Oxygen Decarburization) so as to obtain an intense desulphurisation, thorough deoxidisation and a very restricted analytical range of compositions to ensure repeatability of the mechanical and corrosion properties.

[0050]The refining process could be completed by at least one of the following operations:

[0051]further elaboration of liquid steel at V.I.D.P. (Induction Vacuum Degassing and Pouring);

[0052]source casting in moulds suitable for subsequent forging;

[0053]source casting of ingots intended for subsequent remelting V.A.R. / E.S.R. (Vacuum Arch Remelting / Electro Slag Remelting).

[0054]According to a variant, the ingots obtained after V.A.R. or E.S.R. remelting may be subjected to appropriate homogenisation heat treatment and then transformed into blooms through use of a forging press, for example having two integrated, fully automated...

example 2

n of the Nickel-Based Alloy of the Invention with Traditional Alloys Currently Used

[0058]The nickel-based alloy of the present invention, after heat transformation in the temperature range 1000-1160° C. and solution treatment in the range 1030-1080° C., typically has the mechanical features shown in FIG. 1.

[0059]The nickel-based alloy of the present invention (called “AF.955”), after solution treatment as in the above paragraph, if aged in the temperature range 720-780° C. for 3-8 hours and air cooled (or equivalent cooling, or in case of faster cooling) typically has the mechanical features specified in FIG. 2 and the resistance data to intergranular corrosion and pitting referred to in FIGS. 6-7-8.

[0060]The alloy, after a second ageing at 600°-640° C. for a time ranging from 4-10 hours, followed by air cooling, presents the mechanical characteristics specified in FIG. 3, and the resistance to intergranular corrosion and pitting referred to FIGS. 6-7-8.

[0061]The results of the SCC ...

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Abstract

Manufacturing method of a nickel-based alloy comprising the steps of forging and solution treating a metal mass of the composition described, subjecting the product to a first step of ageing at a higher temperature and a step of cooling in air, to a second step of ageing at a lower temperature and a step of cooling in air to obtain the nickel-based alloy. As a result of steps i)-v)), said alloy comprises metal hardening phases precipitated uniformly throughout its grains. The invention further relates to nickel-based alloys and a use of such alloys.

Description

SCOPE OF THE INVENTION[0001]In recent years, as a result of the significant increase in the energy demand, for the oil extraction industry the problem has arisen of finding oil at increasingly greater depths, both on land and on the seabed.[0002]At the same time the size of the equipment has also increased, reaching up to 18 inches (460 mm) in the wall diameter or thickness. This increase has forced manufacturers to more than double the size of the starting ingots which, given the chemical compositions at play, have presented significant problems regarding the chemical homogeneity of the products even after long and costly homogenisation heat treatments.[0003]Commercially alloys known with the signs N07718, N07716, N07725, currently available on the market for use in the most critical ambients have the following limitations:[0004]the N07718 alloy, with which good mechanical characteristics can be achieved without compromising the grain boundary with elevated precipitations of detrim...

Claims

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Application Information

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IPC IPC(8): C22F1/10C22C19/05
CPCC22F1/10C22C19/055C22C19/051
Inventor FORONI, LUCAMONTANI, RAIMONDO
Owner FORONI
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